COMPETENCY BASED LEARNING MATERIAL
Sector:
AUTOMOTIVE
Qualification:
Automotive Servicing NC I
Unit of Competency:
Test and Repair Wiring/Lighting System
Module Title:
TESTING AND REPAIRING WIRING/LIGHTING SYSTEM
Technical Education and Skills Development Authority
East Service Road, South Superhighway, Taguig, Metro Manila
NATIONAL CERTIFICATE LEVEL 1
QUALIFICATION LEVEL
COMPETENCY-BASED LEARNING MATERIALS
No. Basic Competencies Module Title Code
1. Receive and Respond to 1. Receiving and Responding to 500311101
Workplace Communication Workplace Communication 500311102
2. Work with Others 2. Working with Others 500311103
3. Demonstrate Work Values 3. Demonstrating Work Values 500311104
4. Practice Housekeeping 4. Practicing Housekeeping
Procedures Procedures
No. Common Competencies Module Title Code
1. Apply Appropriate 1. Applying Appropriate ALT723201
ALT723202
Sealant/Adhesive Sealant/Adhesive ALT311201
2. Move and Position Vehicle 2. Moving and Positioning ALT311202
3. Perform Housekeeping Vehicle ALT311203
4. Perform Mensuration and 3. Performing Housekeeping ALT723203
Calculation 4. Performing Mensuration and ALT723204
5. Perform Safety Practices Calculation
6 Read, Interpret and Apply ALT723205
5. Performing Safety Practices
Specifications and Manual
6. Reading, Interpreting and
7. Use and Apply Lubricant/Coolant Applying Specifications and
Manual
8. Perform Shop Maintenance
7. Using and Applying Lubricants/
Coolants
8. Perform Shop Maintenance
No. Core Competencies Module Title Code
ALT723301
1. Perform Diesel Engine Tune Up 1. Performing Diesel Engine
ALT723302
Tune-up
ALT723303
2. Perform Gas Engine Tune Up 2. Performing Gas Engine Tune- ALT723304
ALT723305
up
ALT723306
3. Service Automotive Battery 3. Servicing Automotive Battery
4. Service Ignition System 4. Servicing Ignition System
5. Test and Repair 5. Testing and Repairing
Wiring/Lighting System Wiring/Lighting
System9
6. Perform Underchassis Preventive 6. Performing Underchassis
Maintenance Preventive Maintenance
HOW TO USE THIS COMPETENCY-BASED LEARNING MATERIAL
Welcome to the module “Testing and Repairing Wiring/Lighting System”. This
learning guide contains training materials and activities for you to complete.
The unit of competency "Test and Repair Wiring/Lighting System" contains the
knowledge, skills and attitudes required for an Automotive Servicing. It is one of the
Core Modules at National Certificate Level I (NC I).
You are required to go through a series of learning activities in order to complete
each learning outcomes of the module. In each learning outcome there are
Information Sheets, Resource Sheets and Reference Materials for further reading
to help you better understand the required activities. Follow these activities on your
own and answer the self-check at the end of each learning outcome. Get the answer
key from your instructor and check your work honestly. If you have questions, please
don’t hesitate to ask your facilitator for assistance.
Recognition of Prior Learning (RPL)
You may already have some or most of the knowledge and skills covered in this
learner's guide because you have:
been working for some time
already completed training in this area.
If you can demonstrate to your trainer that you are competent in a particular skill, you
don't have to do the same training again.
If you feel you have some of the skills, talk to your trainer about having them formally
recognized. If you have qualification or Certificates of Competence from previous
training, show it to your trainer. If the skills you acquired are still relevant to the
module, they may become part of the evidence you can present for RPL.
At the end of this learning material is a Learner’s Diary, use this diary to record
important dates, jobs undertaken and other workplace events that will assist you in
providing further details to your trainer or assessors. A Record of Achievement is also
provided for your trainer to complete once you completed the module.
This learning material was prepared to help you achieve the required competency, in
testing and repairing wiring/lighting system. This will be the source of information for
you to acquire knowledge and skills in this particular trade with minimum supervision
or help from your instructor. With the aid of this material you will acquire the
competency independently and at your own pace.
• Talk to your trainer and agree on how you will both organize the training of
this unit. Read through the learning guide carefully. It is divided into
sections which cover all the skills and knowledge you nee to successfully
complete in this module
• Work through all information and complete the activities in each section.
Read information sheets and complete the self-check. Suggested
references are included to supplement the materials provided in this
module.
• Most probably your trainer will also be your supervisor or manager. He/she
is there to support you and show you the correct way to do things. Ask for
help.
• Your trainer will tell you about the important things you need to consider
when you are completing activities and it is important that you listen and
take notes.
• You will be given plenty of opportunities to ask questions and practice on
the job. Make sure you practice your new skills during regular work shifts.
This way you will improve both your speed and memory and also your
confidence.
• Talk to more experienced work mates and ask for their guidance.
• Use self-check questions at the end of each section to test your own
progress.
• When you are ready, ask your trainer to watch you perform the activities
outlined in this learning material.
• As you work through the activities, ask for written feedback on your
progress. Your trainer keeps feedback/pre-assessment reports for this
reason. When you have successfully completed each element, ask your
trainer to mark on the reports that you are ready for assessment.
• When you have completed this learning material and feel confident that you
have had sufficient knowledge and skills, your trainer will arrange an
appointment with a registered assessor to assess you. The results of your
assessment will be recorded in your Competency Achievement Record.
Qualification : Automotive Servicing NC I
Unit of Competency : Test and Repair Wiring/Lighting System
Module Title : Testing and Repairing Wiring/Lighting System
Introduction:
This module covers information and practices in installing, testing and repairing of
wiring/lighting system. Includes definite instruction on how to install lighting system
component, perform testing of possible defects and carry-out repairs. Clear instructions
and techniques required on how to install wiring connections of lighting system is also
embedded.
You need to complete this module by learning the theories and principles
required, closely coupled with the practical activities to master the skills required in this
module. Desirable values and attitude must also be taken into consideration.
This module consists of three learning outcomes, each learning outcome contains
learning activities for both knowledge and skills, supported with information sheets, job
sheets, operation sheets and self-check, gathered from different sources. Before you
perform the manual exercises, read the information/job/operation sheets mentioned in
the special instruction column and answer the self-check for confirmation that you are
equipped with the knowledge necessary to perform the skill portion of the particular
learning outcome with your instructor.
Upon completion of this module, you have to subject yourself to your instructor for
assessment. You will be given a Certificate of Completion as a proof that you have met
the standard requirements (Knowledge & Skill) for this module. The assessment could be
made using different methods, as prescribed in the competency standard.
Learning Outcomes:
At the end of this module, you will be able to:
1. Explain the principle of auto electricity
2. Identify components of Auto lighting system and explain its function
3. Install wiring/lighting system
4. Test electrical system, identify faults and determine preferred action
5. Carry out necessary repairs in the electrical system
Assessment Criteria:
1.1 Ohm’s law is explained
1.2 Circuitry is drawn /traced
1.3 Signs and symbols are interpreted
1.4 Sizes of wire are identified according to job requirement
1.5 Polarity, conductor and insulator are determined
1.6 Law of magnetism is explained
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 1
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
2.1 Component parts of the lighting system are identified
2.1 Functions of every lighting system parts are explained
2.3 Occupational health and safety practices are enumerated
3.1 Lighting system circuit is drawn and interpreted
3.2 Electrical devices such as switches, lights, and fuse boxes are installed
3.3 Wiring leading to different lights and other relevant devices are installed
3.4 Lead terminals of wires are soldered/crimped
4.1 Test is completed without causing damage to workplace / vehicle
4.2 Correct procedure for testing and interpreting schematic diagram is in
accordance with the manufacturers’ specification.
4.3 Testing is carried out and faults/defects are determined using appropriate
tools and techniques.
5.1 Procedure in repairing electrical system is enumerated.
5.2 Necessary repairs are carried out using appropriate tools, technique and
materials.
5.3 Electrical systems are repaired without causing damage to workplace,
property or vehicle
Prerequisite: Before you tackle this module, you must first complete the module on:
Testing and Servicing Automotive Battery.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 2
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Learning Outcome # 1 : Explain the Principles of Auto Electricity
Assessment Criteria :
1. Ohm’s law is explained.
2. Circuitry is drawn/traced.
3. Signs and symbols are interpreted.
4. Sizes of wire are identified according to job requirement.
5. Polarity, conductor and insulator are determined.
6. Law of magnetism is explained.
Resources :
1. Automotive Mechanics 10th Ed by Anglin, C, Chapter 27,
pp. 340-352
2. Automotive Lighting System [CD]
3. Automotive Maintenance Repair, Billiet, W. pp.111
4. Automotive, Electronices and Computer Controls
(Manual)
5. Electronic Circuit [CD]
6. Mathematics for Technical & Vocational Students 9th Ed
by Boyce, Margolis and Slade pp. 14, 82, 84
7. English Plus by Ida-Yap Patrol pp. 69-71, 143, 327
8. Principles of Electricity [CD]
9. Fundamentals of Technical Writing by Nem Signh p. 327
Chapter 17
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 3
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 1: Explain the principle of auto electricity
Learning Activities Special Instructions
Can you explain the operation and
safe handling of different types of
batteries?
What problems have you
encountered in testing and servicing
an automotive battery?
Do you think battery is important in
the automotive lighting system?
1.1.1 Explaining/Illustrating the a. view CD about Ohm’s Law
Ohm’s Law: Its Principles and 1. Electronic Circuits [CD] and answer
Applications the self-check
a. viewing CD and answering 2. Automotive Lighting System [CD]
self-check and answer the self-check
b. reading information sheet and b. read information sheet # 1 and answer
performing provided activities self-check # 1
1.1.2 Solving problems involving a. view CD and answer self-check
voltage, resistance and 1. Electronic circuits [CD]
current: 2. Principles of Electricity [CD]
i. manually
ii. using multi-tester b. derive formulas and solve for voltage,
a. viewing CD and answering current and resistance by reading
self-check information sheet # 2 and answer
self-check # 2
b. reading information sheet and
solving problems
c. performing activities in the job Reference: Mathematics for Technical &
sheet Vocational Students by Boyce,
John G., et al 9th Ed., p. 82
c. perform activities in job sheets # 1a
and 1b
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 4
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 1: Explain the principle of auto electricity (cont.)
Learning Activities Special Instructions
Now, that you have learned that the
principles of auto electricity requires
knowledge of science such as Ohm’s
Law, you may continue to determine the
different parts of the lighting system by
tracing and interpreting the current flow in
the lighting system.
1.2.1 Determining the parts of the
different lighting system
a. reading references a. Read: Parts/Components of Lighting
System & accomplish self-check
#3
Reference: Automotive Mechanics 10th
Ed., pp. 340-352
You are now going to learn the Get the answer key from your
flow of current. instructor and check your work
honestly.
1.2.2 Interpreting/Tracing the
current/electrical flow in the
lighting system
a. viewing CD a. view CD and answer self-check:
i. Auto Lighting System [CD]
b. reading information sheet on ii. Principles of Electricity [CD]
interpreting diagrams
b. read information sheet # 3 and answer
self-check # 4
Having acquired the different Reference: Fundamentals of Technical
information on the electrical flow in the Writing by Nem Singh Chapter
lighting system you are now ready to 17 p. 327
learn and interpret the auto-electrical
signs and symbols.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 5
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 1: Explain the principle of auto electricity (cont.)
Learning Activities Special Instructions
1.3.1 Illustrating and presenting the
auto-electrical signs and
symbols
Reading auto-electrical signs Study the basic auto-electrical symbols
[Automotive Mechanics 10th Ed., by
and symbols
Anglin, pp. 345-346] and perform task
After mastering the different sheet # 1
auto-electrical signs and symbols,
you are now ready to identify the
size of wire according to job
requirement.
1.4.1 Identifying the size of wire a. Get information from the following:
according to job requirement 1. Automotive Mechanics 10th Ed., by
a. research on the different sizes Anglin
of wire according to job 2. Automotive Maintenance Repair by
requirement Billiet
3. Auto, Electronics and Computer
b. answering self-check Control [Manual]
4. Principles of Electricity [CD]
b. answer self-check # 5
c. reading information sheet and c. read information sheet # 4, refer to
answering the activities English Plus Chapter 17, p. 143 by L. Y.
provided Patron
Now that you have learned the different
size of wires according to job
requirements, you are now ready to
proceed to the next activities.
1.5.1 Explaining polarity, conductor a. read [Automotive Mechanics 10th Ed.,
and non-conductor pp.340-356]
a. reading reference books
b. answer task sheet # 2
b. answering task sheet
c. viewing CD c. view CD and answer self-check:
1. Electronic Circuits [CD]
2. Principles of Electricity [CD]
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 6
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 1: Explain the principle of auto electricity (cont.)
Learning Activities Special Instructions
For you to be fully acquainted on the a. read information sheet # 5 [refer to
principles of electricity, you have to English Plus, p. 125 by Patron]
continue to work on the preceding
activities. b. perform job sheet # 2
1.6.1 Performing an experiment in c. view Principles of Electricity [CD] and
attraction and repulsion of answer self-check
magnets
a. reading information sheet on
writing conclusions and
answering the activities
provided
b. performing job sheets
c. viewing CD
Note: To be fully acquainted with the
principles of auto-electricity, you
should have successfully performed
all the activities of this Learning
Outcome.
Are you ready to go on to the next
learning outcome?
Check your performance by marking
the boxes opposite the Learning
Activities of the Learning Outcome
#1: Self-Assessment Guide.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 7
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING OUTCOME #1: SELF-ASSESSMENT GUIDE
1.1.1 Self-check in electronic circuits [CD]; Ohm’s Law
1.1.2
Self-check # 1
1.2.1
1.2.2 Self-check in electronics circuit [CD] and principles of electricity
[CD]; problem solving involving Ohm’s Law
1.3.1
1.4.1 Self-check # 2
1.5.1
Perform Job Sheet 1 & 1.a
1.6.1
Self-check # 3
Self-check in auto lighting system [CD] and principles of electricity
[CD]; electrical flow in lighting system
Self-check # 4
Task Sheet # 1
Self-check # 5
Task Sheet # 2
Self-check in electronics circuit [CD] and principles of electricity
[CD]; conductors and non-conductors
Job Sheet # 2
Self-check in principles of electricity [CD]; principle of electricity and
magnetism
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 8
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
INFORMATION SHEET #1
Describing a Process
Remember that:
We encounter directions all about us, from the simplest form of “Stop” on a street
sign to the intricacies of machine operation, in workbooks and laboratory manuals, on
seed packets and instructions sheets accompanying mechanisms.
Since explanation of a procedure usually leads to action we should give our
directions carefully and well.
The requirements in describing a process are the following:
1. Clarity. Know your subject well and keep the needs of your readers constantly in
mind. Present your subject very well so that they can be grasped readily and
exactly.
2. Complete details. Remember that you are writing not for those who already know
but for those who wish to learn. Tell your readers every detail, therefore, leave no
blanks. As much as possible give all the details.
3. Define special terms.
4. Give reasons for the steps involved. Clear directions, carefully followed steps,
result in a successful and more vivid description.
5. Use appropriate connectives if necessary.
a. Addition: also, besides, furthermore, indeed, moreover
b. Order: first, second, finally, then, in conclusion
c. Time Sequence: then, later, eventually
d. Result: hence, consequently, thus, so, therefore, as a result
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 9
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF-CHECK #1
o In your own words, describe how Ohm’s Law is applied to Automotive
Electricity.
o Let your instructor check your work.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 10
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
INFORMATION SHEET # 2
A. Multiplication and Division of Whole Numbers and Decimals Applied to Ohm’s Law
Multiplication and division of whole numbers and decimals can be illustrated in
determining the current, resistance and voltage on Ohm’s Law: Current is directly
proportional to voltage. In symbols,
I ∞ V where: I = current in ampere
V = voltage in volts
The ratio between the voltage and the current is a constant which is called
resistance, R in ohms. Represented by the formula:
V
= R (formula 1) from where we can derive 2 other formulas
I
which are;
V=IxR (formula 2) and
V (formula 3)
=I
R
Sample Problems:
1. A light bulb has resistance of 240 ohms. Find the current in it when it is connected to
a 120 volt source.
Given: R = 240 ohms
V = 120 volt
Find: I
Solution: From formula 3, I = V / R so, I = 120 volt / 240 ohm
I = 0.5 ampere
2. The current in a coil of an 8 ohms loud speaker is 0.5 ampere. Find the voltage
across its terminals.
Given: R = 8 ohms
I = 0.5 ampere
Find: V
Solution: From formula 2, V = I x R so, V = 0.5 ampere x 8 ohms
V = 4 volts
3. A 120 volts electric heater draws a current of 15 amperes. Find its resistance.
Given: I = 15 amperes
V = 120 volt
Find: R
Solution: From formula 1, R = V / I so, R = 120 volt / 15 amperes
R= 8 ohms
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 11
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
B. Using the Multi-tester
A multi-tester is an electronic device used for several electrical jobs. It is
called multi-tester because of its capability to test several functions, and its
capability to detect both major and minor faults in most electrical and electronic
components. The multi-tester can be used for the following jobs:
Continuity testing
Short circuit test
Measuring the resistance
Measuring battery and circuit voltage
Measuring circuit amperage
NOTE:
The user is required to select the correct position of the selector knob
before performing the test desired. For example, you wish to measure the voltage
rating of a fully charged battery. All you have to do is to turn the selector knob
towards the DC volts. Then, select the maximum voltage range if necessary. This
should be done to protect the tester. For more information, see the multi-tester
below or seek assistance from your instructor.
In the example below, the multi-tester is set to 50 volts DC, which means
the selector knob is pointing to 50 volts DC and the exact reading is 12 volts.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 12
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
JOB SHEET 1a
Simple Circuit (series connection)
Objectives : To be able to connect a simple circuit and apply Ohm’s Law
Materials required : 12-volt bulb
Battery terminals/ alligator clip
Automotive wire wiring board
Switches
Tools and equipment :
Screw driver pliers
Multi-tester
Procedure:
1. Prepare the material.
2. Connect the materials as illustrated below .
3. Measure the voltage and the total resistance with a multi-tester.
Illustration:
Evaluation : If a 12-volt line is connected in series to two bulbs rating 5 amperes each.
What is the total resistance of the circuit?
Solution:
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 13
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
JOB SHEET 1b
Simple Circuit (parallel connection)
Objectives : To be able to connect a simple circuit and apply Ohm’s Law
Materials required : 12-volt bulb
Battery terminals/ alligator clip
Automotive wire wiring board
Switches
Tools and equipment: pliers
Screw driver ammeter
Multi-tester
Procedure:
1. Prepare the material.
2. Connect the materials as illustrated below .
3. Measure the current with an ammeter and the total resistance with a multi-
tester.
Illustration:
Evaluation: If a 12-volt line is connected to two bulbs in parallel rating 5 amperes each.
What is the total resistance of the circuit? What is the resistance of each bulb?
Solution:
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 14
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
TASK SHEET #1
Automotive- Electrical Signs and Symbols
Automotive- Electrical Signs and Symbols are relevant in understanding wiring
diagrams. Accomplish the activity by supplying the appropriate symbol for each of the
following:
MEANING SYMBOL MEANING SYMBOL
Positive Connector
Negative
Ground Male connector
Fuse
Circuit Breaker Female connector
Capacitor
Ohms Multiple connector
Resistor
Denotes wire continues
Variable Resistor elsewhere
Series Resistor Splice
Coil
Step-up Coil Splice identification
Normally Open Contact
Normally Closed Wiring with
Contact Optional
Closed Switch
Open Switch Wiring without
Closed Ganged Switch Thermal element
Open Ganged Switch (bimetal strip)
Two-pole Single-throw Y windings
Switch
Pressure Switch Delta windings
Solenoid Switch
Mercury Switch Digital readout
Diode or Rectifier
Single-filament lamp
Bidirectional Zener
Diode Dual-filament lamp
Light emitting diode
(LED)
Thermistor
Gauge
Timer
Motor
Armature and brushes
Denotes wire goes
through Grommet
Denotes wire goes
through disconnect
Denotes wire goes
through steering
column connector
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 15
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
ANSWER KEY: TASK SHEET # 1
MEANING SYMBOL MEANING SYMBOL
Positive + Connector
Negative -
Ground Male connector
Fuse Ω
Female connector
Circuit Breaker
Capacitor Multiple connector
Ohms
Resistor Denotes wire continues
elsewhere
Variable Resistor Splice
Series Resistor
Coil Splice identification
Step-up Coil Wiring with
Optional
Normally Open Contact
Wiring without
Normally Closed Thermal element
Contact (bimetal strip)
Closed Switch Y windings
Open Switch Delta windings
Closed Ganged Switch
Digital readout
Open Ganged Switch
Single-filament lamp
Two-pole Single-throw
Switch Dual-filament lamp
Pressure Switch
Light emitting diode
Solenoid Switch (LED)
Thermistor
Mercury Switch
Gauge
Diode or Rectifier
Timer
Bidirectional Zener
Diode Motor
Armature and brushes
Denotes wire goes
through Grommet
Denotes wire goes
through disconnect
Denotes wire goes
through steering
column connector
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 16
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF CHECK # 3
Parts / Components of Lighting System
Instruction:
Circle the letter of the best and most probable answer to each question.
1. Which component of the vehicle is controlled by the headlamps switch?
a. courtesy lights
b. head lights
c. break light
2. If the turn signal works properly in one direction but not in the other. Which of this is
the most probable cause?
a. defective flasher
b. blown fuse
c. blown bulb or poor ground on the problem side
3. Which condition usually causes a blown fuse?
a. short circuit
b. poor grounding
c. over loading
4. How is the vehicle lighting system usually connected?
a. series circuit
b. parallel circuit
c. combination of both series and parallel
5. What part of turn signal circuit provides pulsating voltage?
a. hazard switch
b. flasher
c. voltage regulator
6. Which vehicle light is intended for emergency purposes?
a. signal light
b. hazard light
c. break light
7. What part of the lighting system protects the bulb from a fluctuating voltage?
a. fuse
b. voltage regulator
c. relay
8. Which part of the lighting system is considered as the weakest thermo link in a
circuit?
a. bulb
b. relay
c. fuse
9. Which light illuminates every time the transmission is shifted to reverse?
a. back-up light
b. reverse gear
c. reverse horn
10. Which device controls the flow of electric current in every circuit?
a. current regulator
b. switch
c. battery
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 17
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
ANSWER KEY: SELF-CHECK # 3
1. b. head light
2. c. blown bulb or poor ground on the problem side
3. a. short circuit
4. b. parallel circuit
5. b. flasher
6. b. hazard light
7. c. relay
8. c. fuse
9. a. back-up light
10. b. switch
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 18
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
INFORMATION SHEET #3
Interpreting the Current Flow in the Lighting System
Reading Diagrams
Diagrams are visual representations of written words. The purpose of the pictures is to
make clear how parts fit together or function. Many complex components or systems
cannot be easily described in words alone.
Sometimes people who do not like to read will try to understand a subject using only
visual information. However, they may have problems because the picture may not tell
the whole story. A written explanation may be necessary to understand how a system
functions.
You nee to be able to “read” a diagram as well as the text that apply to it. The written
words tell you much of what you nee to know. The diagram lets you see what the words
are describing. Using these two tools together, you may more easily understand what
you nee to know about the function or construction of the part or system.
The text plus the diagram equals the whole picture.
Using Electrical Schematics
Electrical schematics or wiring diagrams are the road maps for current flow. These road
maps show how electricity travels through a circuit.
Being able to read an electrical schematic is vital to your job as an automotive
technician. The electrical and electronics system on a vehicle are becoming more
complex every year. These changes result in new schematics.
These schematics are printed in service manuals and textbooks so that you can read the
electrical paths. Technical terms are use to identify parts in schematics. Electrical
symbols tell what is happening to the electrical current. You may encounter a symbol you
do not recognize. Refer to the key in the book or manual for an explanation. Keys are
usually provided to explain what the symbol represents.
Understanding these terms and symbols will help you successfully diagnose and solve
vehicle problems.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 19
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF-CHECK #4
Interpreting the current flow in the lighting system
• Do the following
A. Follow/Draw/Illustrate the path of the electrical current from
the generator to the battery.
B. Write a paragraph explaining this wiring diagram
• Let your instructor check your work.
A. ELECTRICAL CURRENT FLOW FROM THE GENERATOR TO THE BATTERY
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 20
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
B. INTERPRETATION OF THE ELECTRICAL CURRENT FLOW FROM THE
GENERATOR TO THE BATTERY
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 21
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF CHECK # 5
Identifying the Size of Wire According to Job Requirements
Instruction:
Identify the size of wire suited with the following electrical circuit.
Circle the letter of the corresponding answer.
1. Head light circuit
a. AW-14
b. AW-10
c. AW-18
d. None of the above
2. Signal light circuit
a. AW-14
b. AW-16
c. AW-20
d. All of the above
3. Park light circuit
a. AW-10
b. AW-12
c. AW-16
d. AW-14
4. Tail light circuit
a. AW- 20
b. AW-18
c. AW-12
d. AW-16
5. Reverse light circuit
a. AW-16
b. AW-12
c. AW-18
d. AW-14
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 22
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
ANSWER KEY: SELF-CHECK # 5
1. a. AW-14
2. b. AW-16
3. c. AW-16
4. d. AW-16
5. a. AW-16
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 23
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
TASK SHEET # 2
Battery Polarity
Task Title: Simple lighting circuit observing battery polarity
Objective: To be able to connect a simple lighting circuit observing the effect of the
battery polarity
Material Required:
12 volt battery
1 pc 12 volt bulb with two terminal holder
3 meters automotive wire
1 pc switch
Tools:
1 pc cutter pliers
1pc long nose pliers
1 pc electrical pliers
1 pc multi-tester
Procedure:
1. Place all the materials and tools on clean table.
2. Cut a piece of wire and connect it to the bulb terminals.
3. Using your tools, connect one end of the wire to the positive terminal
of the battery.
4. Connect the remaining end of the wire to the positive terminal of the
battery again. Then switch on.
NOTE: Your bulb comes on.
5. Disconnect one end of the wire from the positive terminal of the
battery then transfer it to the negative terminal of the battery. Then
switch it on again.
NOTE: Your bulb comes on.
Generalization:
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 24
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
JOB SHEET # 2
Principles of Electricity and Magnetism
Job Title : Magnetic Induction
Objective : To be able to observe how magnetic induction occurs
Materials: 2 pcs. bar magnet
Iron fillings
Procedure :
1. Arrange the magnet and observe the reaction between:
a. opposite poles
b. like poles
2. Show a diagram on the flow of magnetism in :
a. opposite poles
b. like poles
From your observation, write a generalization:
Evaluation: If a bar magnet is broken into pieces, what will happen to its magnetic line of
force?
Answer:
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 25
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
RESISTIVITY – is a measure of the ability of a substance to conduct electric current.
The resistance of a conductor obeys Ohm’s law depending on these
factors:
1. The material of which it is composed: the ability to carry an electrical
current varies more than almost any other physical property of a
material.
2. Its length L: The longer the conductor the greater its resistance.
Its cross-sectional area A : The thicker the conductor, the less is its
resistance in symbols, R = ρL / A.
Illustration:
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 26
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Qualification : Automotive Servicing NC I
Unit of Competency
Module Title : Test and Repair Wiring/Lighting System
Learning Outcome #2
Assessment Criteria : Testing and Repairing Wiring/Lighting System
Resources : Identify components of auto lighting system and
explain its functions
:
1. Component parts of the lighting system are identified.
2. Functions of every lighting system parts are explained.
3. Occupational health and safety practices are enumerated.
:
1. Automotive Mechanics 10th ed. By Anglin, C., Chapter 34
pp. 431; Chapter 4 pp 38-47
2. Automotive Lighting System (CD)
3. Fundamentals of Technical Writing by Nem Singh,
Chapter 7 pp 128, Chapter 8 p 156
4. English Plus Ida Yap-Patron Chapter 8 p. 156
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 27
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome #2: Identify the component of auto lighting system
Learning Activities Special Instructions
• Do you have a better
understanding on the principles of
electricity?
• Have you encountered difficulties
in performing the different tasks
and job sheets?
• How did you solve those problems?
After knowing all about the principles of
electricity, are you now ready to identify
the components of the auto-lighting
system?
2.1.1 Identifying the component parts of
the auto lighting system
a. Viewing CD
b. Reading information sheet on a. View CD and answer Self-Check
description and answer activities Ref: Auto Lighting System
You now have identified the parts of the b. Read Information Sheet No. 6
lighting system. Let us now learn the (Refer to Fundamentals of Technical
functions of the different lighting Writing by Nem Singh Chapter 7, p.
system. 128; English Plus by Ida Yap- Patron
Chapter 13, p. 91)
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 28
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome #2: Identify the component of auto lighting system
Learning Activities Special Instructions
2.2.1 Describing the functions of the
different lighting system parts
a. Viewing CD a. View CD and answer Self-Check
Ref: Auto Lighting System
b. Reading books b. Read the functions of the different
lighting system parts on pages 431 –
437 of Auto. Mechanics by Anglin,
C. and answer Self-Check No. 6
c. Reading Information Sheet on c. Read Information Sheet No. 7 and
definition using the structure : answer activities provided. Refer to
Fundamentals of Technical Writing
TERM + LV/V + Function Chapter 6 p. 107.
d. Reading Information Sheet on d. Read Information Sheet No. 8 and
Wattage problems (Bulb) answer Self Check No. 7
e. Reading Information on Voltage and e. Refer to Information Sheet No. 2
amperage
You have just completed the activities in
describing the functions of the different
lighting system. You are now ready to
proceed to the next activities.
2.3.1 Listing down of safety and
occupational health practices
a. Viewing CD a. View CD and answer Self-Check
Refer to CD entitled Shop Safety
b. Reading books b. Read Chapter IV, pages 38-47 of
Automechanic 10th ed. by Anglin, C.
c. Reading Information Sheet on Stating c. Read Information Sheet No. 9 and
precaution, prohibitions and warnings answer activities provided. Refer to
and answering activities. Fundamentals of Technical Writing by
Nem Singh Chapter 8 page 156.
Congratulations! You have done all
activities in identifying the
components of the lighting system.
No doubt you are now ready to
proceed to a more exciting activity.
Good luck!
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 29
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF-ASSESSMENT GUIDELINES
Please CHECK the box for every Self-Check activity that you have completed.
2.1.1 Please refer to CD for the Self-Check
2.2.1 Please refer to CD for the Self-Check
2.2.1 Answer Self-Check No. 6
2.2.1 Please refer Information Sheet No. 8
2.2.1 Answer Self-Check No. 7
2.3.1 Please refer to CD for the Self-Check
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 30
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF-CHECK NO. 6
Functions of the Different Lighting System Parts
MULTIPLE CHOICE: Select the most probable answer to each of the following
questions.
1. Auto lighting circuits that are used when turning on a curve while driving
(a. brake system b. back-up light c. signal light)
2. An automatic-reset circuit breaker used in the directional-signal light
(a. signal switch b. fuse c. flasher)
3. The turn signal works properly in one direction but not in the other, which is the
probable cause?
(a. defective flasher b. blown bulb c. blown turn signal fuse)
4. Both head lamps are dim in the high beam and normal in the low beam, which is
the probable cause? (a. shorted head lamp b. loose head lamp ground c. all
of the above)
5. The head lamp switch controls the vehicle:
a. interior, exterior lights and head lamp
b. signal, dome an courtesy lights
c. brake, back-up an hazard warning
6. The weakest point of the circuit
(a. bulb b. fuse c. terminal block)
7. Lights at the rear indicates that brakes are applied
(a. signal b. tail lamp c. brake light)
8. An electrical device that opens or close a circuit in response to a voltage signal
(a. fuse b. relay c. timer)
9. Light that automatically on when the car door is opened
(a. passenger light b. dashboard light c. courtesy light)
10. A part connecting the battery and the horns by pressing the switch leading to the
ground
(a. head light relay b. horn relay c. push button switch)
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 31
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
ANSWER TO SELF-CHECK NO. 6
Functions of the Different Lighting System Parts
MULTIPLE CHOICE: Select the most probable answer to each of the following
questions.
1. Auto lighting circuits that are used when turning on a curve while driving
(a. brake system b. back-up light c. signal light)
2. An automatic-reset circuit breaker used in the directional-signal light
(a. signal switch b. fuse c. flasher)
3. The turn signal works properly in one direction but not in the other, which is the
probable cause?
(a. defective flasher b. blown bulb c. blown turn signal fuse)
4. Both head lamps are dim in the high beam and normal in the low beam, which is the
probable cause? (a. shorted head lamp b. loose head lamp ground c. all of the
above)
5. The head lamp switch controls the vehicle:
a. interior , exterior lights and head lamp
b. signal, dome an courtesy lights
c. brake, back-up an hazard warning
6. The weakest point of the circuit
(a. bulb b. fuse c. terminal block)
7. Lights at the rear indicates that brakes are applied
(a. signal b. tail lamp c. brake light)
8. An electrical device that opens or close a circuit in response to a voltage signal
(a. fuse b. relay c. timer)
9. Light that automatically on when the car door is opened
(a. passenger light b. dashboard light c. courtesy light)
10. A part connecting the battery and the horns by pressing the switch leading to the
ground
(a. head light relay b. horn relay c. push button switch)
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 32
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
INFORMATION SHEET NO. 7
Calculating Wattage
The formula for determining the power
in an electric circuit: is shown by
multiplying the voltage in "volts" by the
current in "amps" we arrive at an
answer in "watts." Let's apply this to a
circuit example:
In the above circuit, we know we have a
battery voltage of 18 volts and a lamp
resistance of 3 Ω. Using Ohm's Law to
determine current, we get:
Now that we know the current, we can
take that value and multiply it by the
voltage to determine power:
Answer: the lamp is dissipating
(releasing) 108 watts of power, most
likely in the form of both light and heat.
Let's try taking that same circuit and
increasing the battery voltage to see
what happens. Intuition should tell us
that the circuit current will increase as
the voltage increases and the lamp
resistance stays the same. Likewise,
the power will increase as well:
Now, the battery voltage is 36 volts
instead of 18 volts. The lamp is still
providing 3 Ω of electrical resistance to
the flow of electrons. The current is
now:
This stands to reason: if I = E/R, and we
double E while R stays the same, the
current should double. Indeed, it has:
we now have 12 amps of current
instead of 6. Now, what about power?
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 33
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Notice that the power has increased
just as we might have suspected, but it
increased quite a bit more than the
current. Why is this? Because power is
a function of voltage multiplied by
current, and both voltage and current
doubled from their previous values, the
power will increase by a factor of 2 x 2,
or 4. You can check this by dividing 432
watts by 108 watts and seeing that the
ratio between them is indeed 4.
Using algebra again to manipulate the
formulae, we can take our original
power formula and modify it for
applications where we don't know both
voltage and current:
If we only know voltage (E) and
resistance (R):
If we only know current (I) and
resistance (R):
An historical note: it was James Prescott Joule, not Georg Simon Ohm, who first
discovered the mathematical relationship between power dissipation and current through
a resistance. This discovery, published in 1841, followed the form of the last equation (P
= I2R), and is properly known as Joule's Law. However, these power equations are so
commonly associated with the Ohm's Law equations relating voltage, current, and
resistance (E=IR ; I=E/R ; and R=E/I) that they are frequently credited to Ohm.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 34
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
INFORMATION SHEET NO. 8
Wattage Problems
• Electrical power is measured in watts; electrical power is equal to Volts times
Amperes. Thus, we write:
Watt = Volts x Amperes
or,
P=ExI
• The battery supplies 6 x 0.2 = 1.2 watts to the circuit; the load resistor R takes 5.8
x 0.2 = 1.16 watts; the fuse takes 0.2 x 0.2 = 0.04 watt. Note that the power taken
by both resistances is equal to 1.16 + 0.04 = 1.2 watts. In other words, the power
supplied by the battery is exactly equal to the power taken by the circuit
resistance.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 35
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Qualification : Automotive Servicing NC I
Unit of Competency : Test and Repair Wiring/Lighting System
Module Title : Testing and Repairing Wiring/Lighting System
Learning Outcome #3 : Install Wiring/Lighting System
Assessment Criteria
:
Resources 1. Lighting system circuit is drawn and interpreted.
2. Electrical devices such as switches, lights and fuse boxes
are installed.
3. Wires leading to different lights and other relevant devices
are installed.
4. Lead terminals of wires are soldered/crimped.
:
1. Automotive Mechanics 10th ed. By Anglin, C., Chapter 27,
pp. 340
2. Fundamentals of Technical Writing by Nem Singh Chapter
7 p. 128
3. Automotive Electricity, Electronics and Computer by Barry
Hollembeck
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 36
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 3: Install wiring/lighting system
Learning Activities Special Instructions
• Are you familiar with the different
components of the auto lighting
system?
• Did you encounter problems in
identifying the components and
functions of auto lighting system?
• How did you solve these problems?
• Have you tried installing wiring/lighting
system?
The preceding activities will develop
your competence in installing
wiring/lighting system.
3.1.1 Illustrating the lighting system a. Read Automechanics 10th ed., pp.
circuit diagram 431-447 and answer Self-Check
No. 8
a. Reading and interpreting circuit
diagram
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 37
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 3: Install wiring/lighting system
Learning Activities Special Instructions
b. Locating the proper position of d. Locate the actual position of the
lighting components and other lighting system in the vehicle. Ask
devices in the vehicle. the assistance of your instructor if
necessary.
After learning how to read and interpret
circuit diagram, let us now proceed to
the procedures and methods in
installing switches, lights and fuse
boxes.
c. Preparing needed tools and
materials
a. Reading on the steps and a. Read the techniques in installing
procedures in installing switches, switches, lights and fuse boxes.
lights an fuse boxes Refer to pages 431-436 of
Automechanics 10th ed by Crouse
Anglin
b. Reading Information Sheet on b. Read Information Sheet No. 10
description of a process Refer to Fundamentals of Technical
Writing by Nem Singh Chapter 7,
page 128. Answer Activity 4 on
page 72 of The English Plus book
by Ida Yap-Patron.
You now have learned the process in
installing switches, lights and fuse boxes.
You already know the materials and tools to
be used. The next activities will familiarize
you on these. But before going to next
activity you have review on the basic shop
safety and proper handing of tools.
c. Reading an Information Sheet on the c. Read Chapter 4 pages 38 – 47 in the
basic shop safety and proper book Automechanic 10th ed. By C.
handling of tools Anglin
d. Borrowing of needed tools and d. Fill up the borrower’s slip properly.
materials in installing auto lighting Withdraw tools and materials from the
circuits and devices tool keeper.
You have now gathered the needed
materials and tools in installing auto
lighting system. The next activity will be
installation of the electrical circuit.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 38
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 39
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 3: Install wiring/lighting system
Learning Activities Special Instructions
3.2.2 Installing electrical devices
a. Installing switches, lights, fuse boxes a. Perform the procedures in installing
and relays to its proper location switches, lights and fuse boxes and
relays to its appropriate location
3.3.1 Measuring and connecting wire according to standard.
a. Actual inspection of the vehicle to be a. View the actual set up of the vehicle at
worked on the auto shop.
b. Preparing materials to be used in b. Fill up borrower’s slip and withdraw
installing lighting connection needed materials
c. Measuring the distance between the c. Measure accurately the distance
different lighting components using
wire span between the different lighting
d. Reading book for the procedure in components. Use wire span in
connecting wire
measuring.
d. Read: Automotive Electricity,
Electronics and Computer by Barry
Hollembeck.
e. Connecting wire e. Connect the wire of the different
components of the lighting system
You have connected the wire. You are following the procedures properly.
now ready to test the operation of the
circuit.
3.3.2Testing lighting system
a. Connecting the circuit to voltage a. Connect the wiring to the voltage
source by observing safety source. Don’t forget to observe safety
precaution precautions while performing the
activity
b. Switching on the circuit b. Switch on the circuit and see if all
parts of the lighting system is working
c. Checking for faults in the component c. If ever a circuit does not function, trace
which does not function the fault within the checking point of
the circuit.
d. Re-testing of the circuit d. Retest the circuit. Ask assistance from
the instructor if there are problems
which you cannot handle.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 40
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 3: Install wiring/lighting system
Learning Activities Special Instructions
4.1.1 Insulating and soldering
wire/lead terminals
a. Insulating connections using electrical a. Insulate the connections properly.
tape. Use electrical tape in insulating.
b. If there are connections which need b. Solder connection if necessary.
soldering, then do so.
You have installed the auto lighting Assess your performance by
system. You can now assess your comparing it with the performance
performance. standard.
c. Retrieving and returning borrowed c. Retrieve and clean the tools.
tools and unused materials. Gather the unused materials.
Return the tools and materials to
the tool keeper.
d. Housekeeping and 5 S d. Clean the shop work area before
leaving.
CONGRATULATIONS! You have
completed the activities for the module in
Installing Automotive Lighting System.
You may now arrange with your instructor
for assessment.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 41
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
SELF-CHECK NO 8
Illustrating and Interpreting the Circuit Diagram
of Automotive Lighting System
Instructions: Draw the schematic diagram of the automotive lighting system with
the following conditions.
• The source is a 12V battery
• Use the correct electrical symbols
• Warning lights are connected without control from the ignition switch
• All circuits must be connected with individual relay
• Each circuit must be protected by a fuse
• It should be a ground switching connection
• Label every component parts
• The diagram must be done in vertical and horizontal lines only.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 42
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
Qualification : Automotive Servicing NC I
Unit of Competency : Test and Repair Wiring/Lighting System
Module Title : Testing and Repairing Wiring/Lighting System
Learning Outcome #4 : Test electrical system of open and short circuit to
determine faults
Assessment Criteria:
1. Test is completed without causing damage to workplace / vehicle.
2. Correct procedure for testing and interpreting schematic diagram is in
accordance with the manufacturers’ specification.
3. Testing is carried out and faults/defects are determined using
appropriate tools and technique.
Resources:
1. Test and Measurement.
2. Service Manual.
3. Automotive Symbols and Circuit.
4. Safety Comfort and Convenience System.
5. Automotive Electrical / Electronic System
6. Measuring Electricity.
7. Electrical Troubleshooting.
8. Body Electrical System.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 43
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
LEARNING EXPERIENCES
Learning Outcome # 4: Test electrical system of open and short circuit to
determine faults
Learning Activities Special Instructions
1. Can you identify hand tools and • Appropriate hand tools must be check
measuring instrument electricity? for accuracy and safety.
2. What are they and their specific use? • Electrical measuring instrument must
be checked / set for required
Explain how to use VOM in
measuring; calibration.
• Volts
• Resistance
• Current
Draw schematic diagram of the • In drawing a schematic diagram you
following circuits; should be able to identify the proper
electrical symbols
• Head light, tail light circuit
• Identify Specific location of switches
• Signal and park lights circuit. lighting, fuses.
• Identify signal light switch • Identify headlight switch terminals.
terminals.
3. Using test lamp be able to locate • Connect ground terminal to the body
open/short circuit fault. chassis
3.1 Locate the fault by using the test
lamp by trial and error method to;
3.1.1 Head light and tail light
circuit.
3.1.2 Signal light I hazard circuit.
4. Using Ohmmeter is able to locate • Zero Ohmmeter
circuit faults. • De-energize the circuit to be tested
4.1Locate open I short circuit fault in.
4.1.1 Head light and tail light
circuit
4.1.2 Signal light / hazard circuit
5. Using multi tester / VOM be able to • Zero VOM
locate circuit faults. • Set to resistance range X1
5.1Locate open I short circuit fault in.
5.1.1 Head light and tail light • De-energize the circuit to be tested
circuit
5.1.2 Signal light I hazard circuit.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 44
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
6. Using VOM determine circuit faults. • Set to DCV and appropriate DCV
6.1Open / short circuit range
6.2Determine the input I output
voltage of: • Energize the circuit to be tested
6.2.1 Head light I tail light
6.2.2 Signal light / hazard circuit
Voltage drop testing the headlight system
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 45
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
OPERATION SHEET
Operation Title: Test Electrical System of Open and Short circuit to determine
faults.
Purpose: To locate electrical circuit faults by using test lamp
Equipment, Tools Auto electrical mock-up / vehicle
and Materials Test lamp, battery 12V, long nose, pliers, electrical pliers, diagonal
cutting pliers, standard screw driver, automotive #10 wire, 3 meters
Procedure: 1. Connect the alligator clip on the end of the test lead to ground, and
then determine faults in the following circuits;
1.1 Head light I tail light circuit.
If okay the bulb lights when the tip contacts a wire or terminal in
which voltage is present.
1.2 Signal and Park light circuit.
If okay the bulb lights when the tip contacts a wire or terminal in
which voltage is present.
Precautions:
Study the circuit you are testing before using a 12-volt test light. The additional
current drawn by the test light can damage some electronic devices.
Code No. TESTING AND REPAIRING Date: Developed Date: Revised Page 46
ALT723305 WIRING/LIGHTING SYSTEM Oct. 25, 2003 June 11, 2004
The words you are searching are inside this book. To get more targeted content, please make full-text search by clicking here.
test and repair wiring/lighting system
Discover the best professional documents and content resources in AnyFlip Document Base.
Search