Helm Harnesses - Single Helm
System Architecture
Section 3A - Helm Harnesses - Single Helm
Table of Contents
Single‑Helm Harnesses..................................................... 3A-2 Dual‑Engine, Single‑Helm Architecture............................. 3A-5
Installation...................................................................3A-2 Triple‑Engine, Single‑Helm (TESH) Harness Identification 3
Single‑Engine, Single‑Helm (SESH) Harness Identification ....................................................................................... 3A-6
....................................................................................... 3A-2 Triple‑Engine, Single‑Helm Architecture............................3A-8 A
SESH Helm Architecture....................................................3A-3 Quad‑Engine, Single‑Helm (QESH) Harness Identification
Dual‑Engine, Single‑Helm (DESH) Harness Identification ..................................................................................... 3A-10
....................................................................................... 3A-4 Quad‑Engine, Single‑Helm Architecture..........................3A-11
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-1
Helm Harnesses - Single Helm
Single‑Helm Harnesses
IMPORTANT: Refer to the appropriate helm architecture diagram.
• Single helm diagrams are located in Section 6A.
• Dual helm diagrams are located in Section 6B.
• Triple helm diagrams are located in Section 6C.
This section covers single helm harnesses.
Installation
• Ensure that all helm components are laid out with respect to the helm harness breakouts.
• Ensure that the connections can reach all of the components under the helm and along the gunwale.
• Some branches of the harness are extremely short and require components to be mounted in close proximity to each
other.
Single‑Engine, Single‑Helm (SESH) Harness Identification
3
1
4
2
5
8 9 10
6
7
11
12
69509
Page 3A-2 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Single Helm
Ref Connector Connects to...
1 6‑pin female Key switch
2 6‑pin female (blue) Electronic remote control (ERC)
3 Twin bullet Warning horn (attached)
4 3‑pin female Accessory power
5 Twin bullet Lanyard stop switch
6 12‑pin female (green) Electronic remote control (ERC)
7 10‑pin female Junction box
8 2‑pin female CAN X terminator (attached)
9 2‑pin female CAN P terminator (attached)
10 2‑pin female CAN H terminator (attached)
11 Relay socket Gauge power relay (attached)
12 14‑pin male Engine data harness
SESH Helm Architecture
13
1 - 14‑pin data harness (to engine)
2 - CAN X terminator
12 3 - CAN P terminator
4 - CAN H terminator
11 5 - Gauge power relay
6 - Single‑engine, single‑helm harness
7 - Accessory power connector
8 - Junction box
2 3 4 10 9 - Ignition key switch connector
X P H 10 - Lanyard stop switch connectors
11 - Green ERC connector (starboard)
12 - Blue ERC connector (CAN P)
13 - Warning horn
1 9
5
6
8
7
72185
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-3
Helm Harnesses - Single Helm
Dual‑Engine, Single‑Helm (DESH) Harness Identification
11
10
6 12
7
9
5
4 13
3
8
2
1
14
69513
Ref Connector Connects to...
1 Relay socket Accessory power relay (attached)
2 14‑pin male Starboard engine data harness
3 2‑pin female CAN X terminator ‑ starboard (attached)
4 2‑pin female CAN H terminator (attached)
5 2‑pin female CAN X terminator ‑ port (attached)
6 14‑pin male Port engine data harness
7 6‑pin female (blue) Electronic remote control (ERC)
8 Twin bullet Warning horn (attached)
Twin bullet Lanyard stop switch ‑ port
9
Twin bullet Lanyard stop switch ‑ starboard
10 8‑pin female (brown) ERC ‑ port
11 12‑pin female (green) ERC ‑ starboard
6‑pin female Starboard key switch
12
6‑pin female Port key switch
13 10‑pin female Junction box
14 3‑pin female Accessory power
Page 3A-4 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Single Helm
Dual‑Engine, Single‑Helm Architecture
14
1 - 14‑pin data harness (to starboard engine)
2 - 14‑pin data harness (to port engine)
13 3 - CAN X terminator
4 - CAN H terminator
12 5 - Gauge power relay
6 - Dual‑engine, single‑helm harness
11
7 - Accessory power connector
2 8 - Junction box
9 - Ignition key switch connectors
10 - Lanyard stop switch connectors
10 11 - Brown ERC connector (port)
X 12 - Green ERC connector (starboard)
3 13 - Blue ERC connector (CAN P)
14 - Warning horn
9
3 4 6
X H
5
8
1
7
72186
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-5
Helm Harnesses - Single Helm
Triple‑Engine, Single‑Helm (TESH) Harness Identification
5
6
3 7
2
4
8
4 9
4
10
15
11 16
12
14 17
13
1
69517
Page 3A-6 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Single Helm
Ref Connector Connects to...
1 3‑pin female Accessory power
2 10‑pin female Junction box
6‑pin female Starboard key switch
3 6‑pin female Starboard inner (center) key switch
6‑pin female Port key switch
Twin bullet Lanyard stop switch ‑ starboard
4 Twin bullet Lanyard stop switch ‑ starboard inner (center)
Twin bullet Lanyard stop switch ‑ port
5 8‑pin female (gray) ERC ‑ starboard inner (center)
6 12‑pin female (green) ERC ‑ starboard
7 6‑pin female (blue) Electronic remote control (ERC)
8 8‑pin female (brown) ERC ‑ port
9 Twin bullet Warning horn (attached)
10 14‑pin male Starboard engine data harness
11 2‑pin female CAN H terminator (attached)
12 2‑pin female CAN X terminator ‑ starboard (attached)
13 Relay socket Gauge power relay (attached)
14 2‑pin female CAN X terminator ‑ starboard inner (center) (attached)
15 14‑pin male Starboard inner (center) engine data harness
16 14‑pin male Port engine data harness
17 2‑pin female CAN X terminator ‑ port (attached)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-7
Helm Harnesses - Single Helm
Triple‑Engine, Single‑Helm Architecture
16
1 - 14‑pin data harness (to starboard engine)
3 2 - 14‑pin data harness (to center engine)
15 3 - 14‑pin data harness (to port engine)
4 - CAN X terminators
14 5 - CAN H terminator
6 - Gauge power relay
13
X 7 - Triple‑engine, single‑helm harness
4 12 8 - Accessory power connector
9 - Junction box
10 - Ignition key switch connectors
11 - Lanyard stop switch connectors
11
12 - Gray ERC connector (center)
13 - Brown ERC connector (port)
14 - Green ERC connector (starboard)
15 - Blue ERC connector (CAN P)
16 - Warning horn
10
2
10
10
X
4
7
9
4 5
X H
6
1
8
72187
Page 3A-8 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Single Helm
Notes:
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-9
Helm Harnesses - Single Helm
Quad‑Engine, Single‑Helm (QESH) Harness Identification
15
4 9
2 7 13 14 18 17 16
3 5 6
12 19
1 8 11 21 22
20 23
10 24
25
26
69521
Ref Connector Connects to...
1 2‑pin female CAN X terminator ‑ port (attached)
2 14‑pin male Port engine data harness
3 2‑pin female CAN X terminator ‑ port inner (attached)
4 14‑pin male Port inner engine data harness
5 2‑pin female CAN H terminator (attached)
6 2‑pin female CAN X terminator ‑ starboard (attached)
7 14‑pin male Starboard engine data harness
8 Relay socket Gauge power relay (attached)
9 14‑pin male Starboard inner engine data harness
10 2‑pin female CAN X terminator ‑ starboard inner (attached)
11 8‑pin female (gray) ERC ‑ starboard inner
12 6‑pin female (blue) Electronic remote control (ERC)
13 12‑pin female (green) ERC ‑ starboard
14 8‑pin female (black) ERC ‑ port inner
15 8‑pin female (brown) ERC ‑ port
16 Twin bullet Lanyard stop switch ‑ port
17 Twin bullet Lanyard stop switch ‑ port inner
18 Twin bullet Lanyard stop switch ‑ starboard
19 Twin bullet Lanyard stop switch ‑ starboard inner
20 Twin bullet Warning horn (attached)
21 6‑pin female Port key switch
Page 3A-10 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Single Helm
Ref Connector Connects to...
22 6‑pin female Port inner key switch
23 6‑pin female Starboard key switch
24 6‑pin female Starboard inner key switch
25 10‑pin female Junction box
26 3‑pin female Accessory power
Quad‑Engine, Single‑Helm Architecture
18
4 1 - 14‑pin data harness (to starboard engine)
2 - 14‑pin data harness (to starboard inner engine)
17 3 - 14‑pin data harness (to port inner engine)
4 - 14‑pin data harness (to port engine)
16 5 - CAN X terminators
X
5 15 6 - CAN H terminator
7 - Gauge power relay
14 8 - Quad‑engine, single‑helm harness
5 9 - Accessory power connector
10 - Junction box
X 13
11 - Ignition key switch connectors
12 - Lanyard stop switch connectors
13 - Black ERC connector (port inner)
12
3 14 - Gray ERC connector (starboard inner)
15 - Brown ERC connector (port)
16 - Green ERC connector (starboard)
17 - Blue ERC connector (CAN P)
18 - Warning horn
11
2
10
X
5
8
5 6
9
X H
7
1 72188
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3A-11
Helm Harnesses - Single Helm
Notes:
Page 3A-12 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
System Architecture
Section 3B - Helm Harnesses - Multi-Helm
Table of Contents
Helm Harnesses................................................................ 3B-2 Triple‑Engine....................................................................3B-14
Multi‑Helm Harnesses........................................................3B-2 Triple‑Engine, Lower‑Helm Harness Identification... 3B-14 3
Outer Engine Extension Harness............................... 3B-2 Triple‑Engine, Middle‑Helm Harness Identification...3B-16
Inner Engine Extension Harness................................ 3B-2 Triple‑Engine, Upper‑Helm Harness Identification... 3B-18 B
Gauge Power Harness............................................... 3B-2 Triple‑Engine, Dual‑Helm Architecture..................... 3B-19
Global Wake Harness.................................................3B-2 Quad‑Engine....................................................................3B-20
Single‑Engine.....................................................................3B-3 Quad‑Engine, Lower‑Helm Harness Identification....3B-20
Single‑Engine, Lower‑Helm Harness Identification.... 3B-3 Quad‑Engine, Middle‑Helm Harness Identification...3B-22
Single‑Engine, Middle‑Helm Harness Identification....3B-4 Quad‑Engine, Upper‑Helm Harness Identification....3B-24
Single‑Engine, Upper‑Helm Harness Identification.... 3B-5 Quad‑Engine, Dual‑Helm Architecture..................... 3B-25
Single‑Engine, Dual‑Helm Architecture...................... 3B-6 Second Station Delivery Harness Kits............................. 3B-26
Dual‑Engine....................................................................... 3B-7 Kit General Installation Instructions.......................... 3B-26
Dual‑Engine, Lower‑Helm Harness Identification....... 3B-7 Connections for Single‑Engine Configurations.........3B-26
Dual‑Engine, Middle‑Helm Harness Identification...... 3B-8 Connections for Dual‑Engine Configurations............3B-28
Dual‑Engine, Upper‑Helm Harness Identification..... 3B-10 Connections for Triple‑Engine Configurations..........3B-30
Dual‑Engine, Dual‑Helm Architecture.......................3B-12 Connections for Quad‑Engine Configurations.......... 3B-32
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-1
Helm Harnesses - Multi-Helm
Helm Harnesses
IMPORTANT: Refer to the appropriate system architecture drawing in Section 8A.
• Ensure that all helm components are laid out with respect to the helm harness breakouts.
• Ensure that the connections can reach all of the components under the helm and along the gunwale.
• Some branches of the harness are extremely short and require components to be mounted in close proximity to each
other.
Multi‑Helm Harnesses
For boats with multiple helms, extension harnesses are required to connect the upper and lower helms. The exact harnesses
required depends on the number of engines.
Extension harness connectors are not color coded. Be certain to not cross‑connect extension harnesses.
Outer Engine Extension Harness
The outer engine extension harness has two connectors at either end of the harness. A 6‑pin connector allows transmission of
CAN X, 5‑amp clean power, wake, and E‑stop signals between the helms. A 4‑pin connector is used for CAN P and CAN H on
the starboard engine and for CAN P and global wake on the port engine.
70759
The outer engine extension harness is used for all multiple helm applications. As indicated by the name, triple and quad‑engine
applications use it only on the outer engines.
Inner Engine Extension Harness
The inner engine extension harness has one 6‑pin connector at either end of the harness. It does not transmit CAN P, CAN H,
or global wake signals. As the name implies, the inner engine extension harness is used only on the inner engines on triple and
quad‑engine applications.
70760
Gauge Power Harness
The gauge power harness is used on all multiple helm applications. This gray, 2‑wire harness is used to supply power for
gauges at the upper helm.
70761
Global Wake Harness
The global wake harness is used only on single‑engine applications, where there is only one outer engine extension harness.
The harness transmits the global wake signal typically handled by the port extension harness on a multiple engine application.
70762
Page 3B-2 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Single‑Engine
Single‑Engine, Lower‑Helm Harness Identification
9
10
8
6
5 7
11
4
2 3
13
12
1
69512
Ref Connector Connects to...
1 14‑pin male Engine data harness
2 6‑pin female (green) Multi‑helm breakout
3 4‑pin female Multi‑helm breakout
4 2‑pin female Multi‑helm gauge power
5 2‑pin female Global wake (multi‑helm)
6 Relay socket Gauge power relay (attached)
7 Twin bullet Lanyard stop switch
8 12‑pin female (green) Electronic remote control (ERC) ‑ starboard
9 6‑pin female (blue) ERC ‑ CAN P
10 6‑pin female Key switch
11 Twin bullet Warning horn (attached)
12 3‑pin female Accessory power
13 10‑pin female Junction box (J‑box)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-3
Helm Harnesses - Multi-Helm
Single‑Engine, Middle‑Helm Harness Identification
6
5
4
7
3
4
8
3
2
2
1 1 9 10
69510
Ref Connector Connects to...
1 4‑pin female (white) x2 Multi‑helm breakout
2 2‑pin female (gray) x2 Global wake (multi‑helm)
3 6‑pin female (green) x2 Multi‑helm connection
4 2‑pin female x2 Gauge power
5 Relay socket Gauge power relay (attached)
6 10‑pin female Junction box
7 Twin bullet Warning horn (attached)
8 Twin bullet Lanyard stop switch
9 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
10 12‑pin female (green) ERC ‑ starboard
Page 3B-4 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Single‑Engine, Upper‑Helm Harness Identification
4
3
2 5
6 7 8 1
13
9
10 12
11
69511
Ref Connector Connects to...
1 12‑pin female (green) Electronic remote control (ERC) ‑ starboard
2 6‑pin female (blue) ERC ‑ CAN P
3 Twin bullet Warning horn (attached)
4 Twin bullet Lanyard stop switch
5 10‑pin female Junction box (J‑box)
6 2‑pin female CAN X terminator (attached)
7 2‑pin female CAN P terminator (attached)
8 2‑pin female CAN H terminator (attached)
9 Relay socket Gauge power relay (attached)
10 2‑pin female Multi‑helm gauge power
11 6‑pin female (green) Multi‑helm connection
12 2‑pin female Global wake (multi‑helm)
13 4‑pin female Multi‑helm connection
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-5
Helm Harnesses - Multi-Helm
Single‑Engine, Dual‑Helm Architecture
3
4
5
2 9
6 3
1 X P H 4
7 8 10
5
11 6
2
12
13 15
14
16
17 17
72189
1 - 14‑pin data harness connector (to engine)
2 - Gauge power relay
3 - Warning horn
4 - Blue ERC connector (CAN P)
5 - Green ERC connector (starboard)
6 - Lanyard stop switch connectors
7 - Ignition key switch connector
8 - CAN X terminator
9 - CAN P terminator
10 - CAN H terminator
11 - Single‑engine, lower‑helm harness
12 - Multiple helm gauge power link harness
13 - Multiple helm link harness (outer)
14 - Global wake link harness
15 - Single‑engine, upper‑helm harness
16 - Accessory power connector
17 - Junction box connector
Page 3B-6 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Dual‑Engine
Dual‑Engine, Lower‑Helm Harness Identification
7
8
6
5
9
2 11
10
4 1
3 12
14
13
16
17
15
18
69516
Ref Connector Connects to...
1 2‑pin female Gauge power
2 4‑pin female (white) Multi‑helm breakout ‑ starboard
3 14‑pin male Port engine data harness
4 14‑pin male Starboard engine data harness
5 6‑pin female (green) Multi‑helm breakout ‑ starboard
6 6‑pin female (brown) Multi‑helm breakout ‑ port
7 4‑pin female (white) Multi‑helm breakout ‑ port
8 Relay socket Gauge power relay (attached)
9 3‑pin female Accessory power
10 Twin bullet Lanyard stop switch ‑ starboard
11 Twin bullet Warning horn (attached)
12 Twin bullet Lanyard stop switch ‑ port
13 6‑pin female Port key switch
14 6‑pin female Starboard key switch
15 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
16 12‑pin female (green) ERC ‑ starboard
17 8‑pin female (brown) ERC ‑ port
18 10‑pin female Junction box
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-7
Helm Harnesses - Multi-Helm
Dual‑Engine, Middle‑Helm Harness Identification
5
1 4
2 6
7
3
18
17
16
11 8
12
15 14 13 10 9 69514
Page 3B-8 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Ref Connector Connects to...
1 10‑pin female Junction box
2 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
3 Twin bullet Warning horn (attached)
4 Twin bullet Lanyard stop switch ‑ port
5 8‑pin female (brown) ERC ‑ port
6 Twin bullet Lanyard stop switch ‑ starboard
7 12‑pin female (green) ERC ‑ starboard
8 6‑pin female (green) Multi‑helm breakout ‑ starboard
9 4‑pin female (white) Multi‑helm breakout ‑ starboard
10 4‑pin female (white) Multi‑helm breakout ‑ starboard
11 6‑pin female (green) Multi‑helm breakout ‑ starboard
12 6‑pin female (brown) Multi‑helm breakout ‑ port
13 6‑pin female (brown) Multi‑helm breakout ‑ port
14 4‑pin female (white) Multi‑helm breakout ‑ port
15 4‑pin female (white) Multi‑helm breakout ‑ port
16 2‑pin female Gauge power
17 2‑pin female Gauge power
18 Relay socket Gauge power relay (attached)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-9
Helm Harnesses - Multi-Helm
Dual‑Engine, Upper‑Helm Harness Identification
5
6 7
4
1
2
3
16
11
15
14 10 8
12
13 9 69515
Page 3B-10 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Ref Connector Connects to...
1 10‑pin female Junction box
2 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
3 Twin bullet Warning horn (attached)
4 Twin bullet Lanyard stop switch ‑ port
5 8‑pin female (brown) ERC ‑ port
6 Twin bullet Lanyard stop switch ‑ starboard
7 12‑pin female (green) ERC ‑ starboard
8 6‑pin female (green) Multi‑helm breakout ‑ starboard
9 4‑pin female Multi‑helm breakout ‑ starboard
10 2‑pin female CAN X terminator (attached) ‑ starboard
11 2‑pin female CAN H terminator (attached)
12 6‑pin female (brown) Multi‑helm breakout ‑ port
13 4‑pin female Multi‑helm breakout ‑ port
14 2‑pin female Gauge power
15 2‑pin female CAN X terminator (attached) ‑ port
16 Relay socket Gauge power relay (attached)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-11
Helm Harnesses - Multi-Helm
Dual‑Engine, Dual‑Helm Architecture
3
4 3 4
5 5
1
6 6
7 7
X
8
9 10 11 11
12 13
14
9
15
16 X H
8
2 17 17
72190
1 - 14‑pin data harness connector (to port engine)
2 - 14‑pin data harness connector (to starboard engine)
3 - Gauge power relay
4 - Warning horn
5 - Blue ERC connector (CAN P)
6 - Green ERC connector (starboard)
7 - Brown ERC connector (port
8 - CAN X terminators
9 - Multiple helm link harness (outer)
10 - Multiple helm gauge power link harness
11 - Lanyard stop switch connectors
12 - Dual‑engine, lower‑helm harness
13 - Dual‑engine, upper‑helm harness
14 - Ignition key switch connectors
15 - CAN H terminator
16 - Accessory power connector
17 - Junction box connector
Page 3B-12 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Notes:
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-13
Helm Harnesses - Multi-Helm
Triple‑Engine
Triple‑Engine, Lower‑Helm Harness Identification
10 12 11
13
14
15
16 22
1 21
9
23
20
2 17
8
3 18 19
4
7
5
6 69520
Ref Connector Connects to...
1 6‑pin female (brown) Multi‑helm breakout ‑ port
2 6‑pin female (green) Multi‑helm breakout ‑ starboard
3 14‑pin male Port engine data harness
4 4‑pin female (white) ‑ not visible Multi‑helm breakout ‑ port
5 14‑pin male Starboard engine data harness
6 4‑pin female (white) Multi‑helm breakout ‑ starboard
7 14‑pin male Starboard inner (center) engine data harness
8 2‑pin female Gauge power
9 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner (center)
10 Relay socket Gauge power relay (attached)
11 6‑pin female Port key switch
12 6‑pin female Starboard inner (center) key switch
13 6‑pin female Starboard key switch
14 12‑pin female (green) Electronic remote control (ERC) ‑ starboard
15 8‑pin female (brown) ERC ‑ port
16 8‑pin female (gray) ERC ‑ starboard inner (center)
17 10‑pin female Junction box
18 6‑pin female (blue) ERC ‑ CAN P
19 Twin bullet Warning horn (attached)
20 Twin bullet Lanyard stop switch‑ port
21 Twin bullet Lanyard stop switch ‑ starboard inner (center)
22 Twin bullet Lanyard stop switch ‑ starboard
23 3‑pin female Accessory power
Page 3B-14 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Notes:
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-15
Helm Harnesses - Multi-Helm
Triple‑Engine, Middle‑Helm Harness Identification
5
2 7
6
1 4
8 9
3
22
21
20
13 10
16
19 18 17 15 14 12 11 69518
Page 3B-16 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Ref Connector Connects to...
1 10‑pin female Junction box
2 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
3 Twin bullet Warning horn (attached)
4 Twin bullet Lanyard stop switch ‑ port
5 8‑pin female (brown) ERC ‑ port
6 Twin bullet Lanyard stop switch ‑ starboard inner (center)
7 8‑pin female (gray) ERC ‑ starboard inner (center)
8 Twin bullet Lanyard stop switch ‑ starboard
9 12‑pin female (green) ERC ‑ starboard
10 6‑pin female (green) Multi‑helm breakout ‑ starboard
11 4‑pin female (white) Multi‑helm breakout ‑ starboard
12 4‑pin female (white) Multi‑helm breakout ‑ starboard
13 6‑pin female (green) Multi‑helm breakout ‑ starboard
14 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner (center)
15 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner (center)
16 6‑pin female (brown) Multi‑helm breakout ‑ port
17 6‑pin female (brown) Multi‑helm breakout ‑ port
18 4‑pin female (white) Multi‑helm breakout ‑ port
19 4‑pin female (white) Multi‑helm breakout ‑ port
20 2‑pin female Gauge power
21 2‑pin female Gauge power
22 Relay socket Gauge power relay (attached)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-17
Helm Harnesses - Multi-Helm
Triple‑Engine, Upper‑Helm Harness Identification
3 4 5 6
2 7 8 9
1 10
14 11
15
13
16
20 12
17
19 18
69519
Ref Connector Connects to...
1 Twin bullet Warning horn (attached)
2 Twin bullet Lanyard stop switch ‑ port
3 Twin bullet Lanyard stop switch ‑ starboard inner (center)
4 Twin bullet Lanyard stop switch ‑ starboard
5 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
6 8‑pin female (brown) ERC ‑ port
7 8‑pin female (gray) ERC ‑ starboard inner (center)
8 10‑pin female Junction box
9 12‑pin female (green) ERC ‑ starboard
10 6‑pin female (brown) Multi‑helm breakout ‑ port
11 2‑pin female CAN X terminator (attached) ‑ port
12 Relay socket Gauge power relay (attached)
13 2‑pin female CAN X terminator (attached) ‑ starboard inner (center)
14 4‑pin female (white) Multi‑helm breakout ‑ port
15 2‑pin female Gauge power
16 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner (center)
17 2‑pin female CAN X terminator (attached) ‑ starboard
18 2‑pin female CAN H terminator (attached)
19 4‑pin female (white) Multi‑helm breakout ‑ starboard
20 6‑pin female (green) Multi‑helm breakout ‑ starboard
Page 3B-18 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Triple‑Engine, Dual‑Helm Architecture
4
5 4 5
6 6
1
7 7
8 8
9 X 9
10
11 12
13 13
14
2 15 16
17
11
19
18 10 X H
3 20 20
72191
1 - 14‑pin data harness connector (to port engine)
2 - 14‑pin data harness connector (to center engine)
3 - 14‑pin data harness connector (to starboard engine)
4 - Gauge power relay
5 - Warning horn
6 - Blue ERC connector (CAN P)
7 - Green ERC connector (starboard)
8 - Brown ERC connector (port)
9 - Gray ERC connector (center)
10 - CAN X terminators
11 - Multiple helm link harness (outer)
12 - Multiple helm gauge power link harness
13 - Lanyard stop switch connectors
14 - Triple‑engine, lower‑helm harness
15 - Ignition key switch connectors
16 - Triple‑engine, upper‑helm harness
17 - Multiple helm link harness (inner)
18 - Accessory power connector
19 - CAN H terminator
20 - Junction box connector
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-19
Helm Harnesses - Multi-Helm
Quad‑Engine
Quad‑Engine, Lower‑Helm Harness Identification
18
16 17 21
19 20
15 22 23
1 12 24
2
14 25 26
3 13 27
4 10 28
5
7 11
6
8 9
69524
Ref Connector Connects to...
1 6‑pin female (green) Multi‑helm breakout ‑ starboard
2 6‑pin female (black) Multi‑helm breakout ‑ port inner
3 14‑pin male Starboard engine data harness
4 4‑pin female (white) Multi‑helm breakout ‑ starboard
5 14‑pin male Port inner engine data harness
6 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner
7 4‑pin female (white) Multi‑helm breakout ‑ port
8 14‑pin male Starboard inner engine data harness
9 14‑pin male Port engine data harness
10 2‑pin female Gauge power
11 6‑pin female (brown) Multi‑helm breakout ‑ port
12 Relay socket Gauge power relay (attached)
13 Twin bullet Warning horn (attached)
14 Twin bullet Lanyard stop switch ‑ starboard inner
15 Twin bullet Lanyard stop switch ‑ port inner
16 8‑pin female (gray) Electronic remote control (ERC) ‑ starboard inner
17 12‑pin female (green) ERC ‑ starboard
18 Twin bullet Lanyard stop switch ‑ starboard
19 8‑pin female (brown) ERC ‑ port
20 8‑pin female (black) ERC ‑ port inner
21 Twin bullet Lanyard stop switch ‑ port
22 6‑pin female (blue) ERC ‑ CAN P
23 10‑pin female Junction box
24 3‑pin female Accessory power
25 6‑pin female Port key switch
26 6‑pin female Port inner key switch
27 6‑pin female Starboard inner key switch
28 6‑pin female Starboard key switch
Page 3B-20 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Notes:
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-21
Helm Harnesses - Multi-Helm
Quad‑Engine, Middle‑Helm Harness Identification
5 6 7 9
1
4 8
3
10 11
2
26
25
12
24
15
23 20 13
22 21 19 18 17 16 14 69522
Page 3B-22 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Ref Connector Connects to...
1 10‑pin female Junction box
2 Twin bullet Warning horn (attached)
3 6‑pin female (blue) Electronic remote control (ERC) ‑ CAN P
4 Twin bullet Lanyard stop switch ‑ port
5 8‑pin female (brown) ERC ‑ port
6 Twin bullet Lanyard stop switch ‑ port inner
7 8‑pin female (black) ERC ‑ port inner
8 Twin bullet Lanyard stop switch ‑ starboard inner
9 8‑pin female (gray) ERC ‑ starboard inner
10 Twin bullet Lanyard stop switch ‑ starboard
11 12‑pin female (green) ERC ‑ starboard
12 6‑pin female (green) Multi‑helm breakout ‑ starboard
13 4‑pin female (white) Multi‑helm breakout ‑ starboard
14 4‑pin female (white) Multi‑helm breakout ‑ starboard
15 6‑pin female (green) Multi‑helm breakout ‑ starboard
16 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner
17 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner
18 6‑pin female (black) Multi‑helm breakout ‑ port inner
19 6‑pin female (black) Multi‑helm breakout ‑ port inner
20 6‑pin female (brown) Multi‑helm breakout ‑ port
21 6‑pin female (brown) Multi‑helm breakout ‑ port
22 4‑pin female (white) Multi‑helm breakout ‑ port
23 4‑pin female (white) Multi‑helm breakout ‑ port
24 2‑pin female Gauge power
25 2‑pin female Gauge power
26 Relay socket Gauge power relay (attached)
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-23
Helm Harnesses - Multi-Helm
Quad‑Engine, Upper‑Helm Harness Identification
10
9 11 24
23
8 22
12 21
1 13
20
7 6
2 5 19
4
14
15
16
17 18
3
69523
Ref Connector Connects to...
1 Relay socket Gauge power relay (attached)
2 2‑pin female CAN X terminator (attached) ‑ port
3 4‑pin female (white) Multi‑helm breakout ‑ port
4 6‑pin female (brown) Multi‑helm breakout ‑ port
5 2‑pin female Gauge power
6 2‑pin female CAN X terminator (attached) ‑ starboard
7 2‑pin female CAN H terminator (attached)
8 2‑pin female CAN X terminator (attached) ‑ port inner
9 2‑pin female CAN X terminator (attached) ‑ starboard inner
10 6‑pin female (gray) Multi‑helm breakout ‑ starboard inner
11 6‑pin female (black) Multi‑helm breakout ‑ port inner
12 6‑pin female (green) Multi‑helm breakout ‑ starboard
13 4‑pin female (white) Multi‑helm breakout ‑ starboard
14 12‑pin female (green) Electronic remote control (ERC) ‑ starboard
15 8‑pin female (gray) ERC ‑ starboard inner
16 6‑pin female (blue) ERC ‑ CAN P
17 8‑pin female (black) ERC ‑ port inner
18 8‑pin female (brown) ERC ‑ port
19 10‑pin female Junction box
20 Twin bullet Lanyard stop switch ‑ port
21 Twin bullet Lanyard stop switch ‑ starboard
22 Twin bullet Lanyard stop switch ‑ starboard inner
23 Twin bullet Lanyard stop switch ‑ port inner
24 Twin bullet Warning horn (attached)
Page 3B-24 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Quad‑Engine, Dual‑Helm Architecture
5
6 5 6
7 7
1
8 8
9 9
10 X 10
12
11 11
13 14
15 16 16
17
2
12
18 X 19
3
17
13
21
20 12 X H
4 22 22
72192
1 - 14‑pin data harness connector (to port engine)
2 - 14‑pin data harness connector (to port inner engine)
3 - 14‑pin data harness connector (to starboard inner engine)
4 - 14‑pin data harness connector (to starboard engine)
5 - Gauge power relay
6 - Warning horn
7 - Blue ERC connector (CAN P)
8 - Green ERC connector (starboard)
9 - Brown ERC connector (port)
10 - Gray ERC connector (starboard inner)
11 - Black ERC connector (port inner)
12 - CAN X terminator
13 - Multiple helm link harness (outer)
14 - Multiple helm gauge power link harness
15 - Quad‑engine, lower‑helm harness
16 - Lanyard stop switch connectors
17 - Multiple helm link harness (inner)
18 - Ignition key switch connectors
19 - Quad‑engine, upper‑helm harness
20 - Accessory power connector
21 - CAN H terminator
22 - Junction box connector
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-25
Helm Harnesses - Multi-Helm
Second Station Delivery Harness Kits
These kits are used on multi‑station boats in situations where the upper station is not installed and the vessel needs to be
transported. The new CAN architecture and purpose‑built harnessing prevents simply disconnecting the upper station.
Kit General Installation Instructions
IMPORTANT: If the CAN terminators are not connected in the proper locations, the control system will not function correctly.
The adapters, weather caps, and terminators can be installed at either the lower helm or the upper helm. General instructions
are:
1. Choose a location to install the kit: lower helm or upper helm.
2. Disconnect all extension harnesses from the helm harness (upper or lower, as decided previously).
3. Connect the adapter harnesses to the open connectors on the helm harness and extension harnesses.
4. Install the CAN terminators on the appropriate adapter harnesses closest to the lower helm.
a. If the kit is installed at the lower helm, install the terminators on the adapter harnesses connected to the lower helm
harness.
b. If the kit is installed at the upper helm, install the terminators on the adapter harnesses connected to the extension
harnesses.
5. Install the weather caps on all remaining open connectors.
Connections for Single‑Engine Configurations
Kit Installed at the Lower Helm
1 - CAN 2‑pin weather cap
2 - 2‑pin CAN terminator (blue)
3 - Global wake weather cap ‑ helm
4 - Global wake weather cap ‑
extension
5 - Gauge power weather cap ‑ helm
6 - Gauge power weather cap ‑
extension
7 - 6‑pin delivery harness (brown/
yellow) ‑ helm
8 - 4‑pin delivery harness (blue/
white, green/orange) ‑ helm
9 - 6‑pin delivery harness (brown/
yellow) ‑ extension
10 - 4‑pin delivery harness (blue/
white, green/orange) ‑ extension
3 5
6
8 7
9
1
1
2 2 2 1
10
4
71425
Page 3B-26 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Kit Installed at the Upper Helm
1 - CAN 2‑pin weather cap
2 - 2‑pin CAN terminator
(blue)
3 - Global wake weather
cap ‑ helm
4 - Global wake weather
cap ‑ extension
5 - Gauge power weather
cap ‑ helm
6 - Gauge power weather
cap ‑ extension
7 - 6‑pin delivery harness
X P H
(brown/yellow) ‑ helm
8 - 4‑pin delivery harness
(blue/white, green/
orange) ‑ helm
9 - 6‑pin delivery harness
(brown/yellow) ‑
extension
10 - 4‑pin delivery harness
5 3 (blue/white, green/
7 orange) ‑ extension
8
6
1 1 1
9
2
2
2
4 10
71425
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-27
Helm Harnesses - Multi-Helm
Connections for Dual‑Engine Configurations
Kit Installed at the Lower Helm
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑ helm
5 - Gauge power weather cap ‑
4 extension
7 6 - 6‑pin delivery harness (brown/yellow)
6 ‑ helm
7 - 4‑pin delivery harness (blue/white,
green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/yellow)
2 3 5 ‑ extension
9 - 4‑pin delivery harness (blue/white,
8 green/orange) ‑ extension
2
2
2 9
1
2 9
2
2
8
3 3
6
7
71685
Page 3B-28 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Kit Installed at the Upper Helm
4 X
7
6
5
8 2 2 2
3
2
9
1
9
3
3
8 2 2 2
6
7
X H
71686
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑ helm
5 - Gauge power weather cap ‑ extension
6 - 6‑pin delivery harness (brown/yellow) ‑ helm
7 - 4‑pin delivery harness (blue/white, green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/yellow) ‑ extension
9 - 4‑pin delivery harness (blue/white, green/orange) ‑ extension
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-29
Helm Harnesses - Multi-Helm
Connections for Triple‑Engine Configurations
Kit Installed at the Lower Helm
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑
helm
5 - Gauge power weather cap ‑
4 extension
7 6 - 6‑pin delivery harness (brown/
6 yellow) ‑ helm
7 - 4‑pin delivery harness (blue/
white, green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/
2 3 5 yellow) ‑ extension
9 - 4‑pin delivery harness (blue/
8 white, green/orange) ‑ extension
2
2
2 9
1
8
6 2
2 9
2
3
2
8
3 3
6
7
71681
Page 3B-30 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Kit Installed at the Upper Helm
4 X
7
6
5
8 2 2 2
3
2
9
1
8 3 2 6
X
9
3
3
8 2 2 2
6
7
X H
71682
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑ helm
5 - Gauge power weather cap ‑ extension
6 - 6‑pin delivery harness (brown/yellow) ‑ helm
7 - 4‑pin delivery harness (blue/white, green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/yellow) ‑ extension
9 - 4‑pin delivery harness (blue/white, green/orange) ‑ extension
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-31
Helm Harnesses - Multi-Helm
Connections for Quad‑Engine Configurations
Kit Installed at the Lower Helm
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑
helm
5 - Gauge power weather cap ‑
4 extension
7 6 - 6‑pin delivery harness (brown/
6 yellow) ‑ helm
7 - 4‑pin delivery harness (blue/
white, green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/
2 3 5 yellow) ‑ extension
9 - 4‑pin delivery harness (blue/
8 white, green/orange) ‑ extension
2
2
2 9
6 2
8
3
1
3
8
6 2
2 9
2
2
8
3 3
6
7
71458
Page 3B-32 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Helm Harnesses - Multi-Helm
Kit Installed at the Upper Helm
4 X
7
6
5
8 2 2 2
3
2 X
9
8 3 2 6
1
8 3 2 6
9
3 X
3
8 2 2 2
6
7
X H
71459
1 - DTS link assembly (blue/white)
2 - CAN 2‑pin weather cap
3 - 2‑pin CAN terminator (blue)
4 - Gauge power weather cap ‑ helm
5 - Gauge power weather cap ‑ extension
6 - 6‑pin delivery harness (brown/yellow) ‑ helm
7 - 4‑pin delivery harness (blue/white, green/orange) ‑ helm
8 - 6‑pin delivery harness (brown/yellow) ‑ extension
9 - 4‑pin delivery harness (blue/white, green/orange) ‑ extension
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3B-33
Helm Harnesses - Multi-Helm
Notes:
Page 3B-34 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Clean Power
System Architecture
Section 3C - Clean Power
Table of Contents
Clean Power Circuits......................................................... 3C-2 2‑Pin Clean Power Harness....................................... 3C-2
Helm Power................................................................3C-2 4‑Pin Clean Power Harness with Dual Fuses.............3C-3 3
Junction Box Power....................................................3C-2 4‑Pin Clean Power Harness with a Single Fuse.........3C-4
Clean Power Harness Connections...................................3C-2 Clean Power Options.........................................................3C-5 C
Clean Power Harness Types.............................................3C-2
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3C-1
Clean Power
Clean Power Circuits
Clean power refers to a power supply connected directly to the battery.
There are two power circuits on the helm harness that are powered off the clean power source. They are helm power and
junction box power.
Helm Power
Helm power is used to power critical system components. This circuit is sometimes referred to as traditional clean power. Some
of the components powered are helm modules, steering system modules, electronic throttle and shift levers, joysticks, and
electric steering helms.
Junction Box Power
Junction box power is used to power non‑critical components that are connected through the junction box or junction box
connector. This circuit is sometimes labeled as or referred to as gauge power. On multiple engine applications, this circuit is
powered from the starboard side.
Clean Power Harness Connections
! WARNING
Avoid serious injury or death from the loss of DTS electrical power. The DTS power harness must be securely fastened with
cable ties to one of the battery cables near the battery. If not properly secured, the DTS power harness could be pulled off the
battery, resulting in the loss of electrical power and a loss of throttle and shift control.
IMPORTANT: Do not extend the lead length of the clean power harness.
Do not connect the clean power harness through a battery switch. Clean power must be connected directly to the starting
battery.
1. Connect the ring terminals on the clean power harness directly to the starting battery.
2. Fasten the clean power harness to one of the battery cables with a cable tie.
3711
Clean Power Harness Types
2‑Pin Clean Power Harness
Overview
The 2‑pin clean power harness has a single power circuit and is fused at 5 amps at the battery.
72671
Application
1. Outboard and MerCruiser gas: Used on single‑engine, single‑helm (SESH) and dual‑engine, single‑helm (DESH)
applications, where the 14‑pin data harness is less than or equal to 10.7 m (35 ft). On these applications, the 2‑pin
connector is located on the engine and is used to power the helm power circuit. Junction box power is supplied and fused
at the engine.
Page 3C-2 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021
Clean Power
2. Diesel: Diesel applications use a 14‑pin T‑harness with a 2‑pin connector to connect this harness. On these applications,
the harness supplies power to the junction box circuit.
70763
Architecture
2-pin harness connected at the engine
e a - 14‑pin data harness
b
b - 2‑pin clean power harness connector
a c - 2‑pin clean power harness
d - Battery
c
d e - Negative engine battery cable
f - Positive engine battery cable
f
26984
2-pin harness connected at a T-harness (diesel only)
a - 14‑pin data harness
b b - Clean power harness
c - Clean power T‑harness (2‑pin)
a c
72670
4‑Pin Clean Power Harness with Dual Fuses
Overview
The 4‑pin, dual‑fuse clean power harness provides two power circuits to the engine and helm electronics. Although connected
to the engine cranking battery, these circuits are separate from the main power cables that connect the starting battery to the
starter and alternator, to reduce electrical noise. One circuit is fused at 7.5 amps (red/white and black/white wires) while the
other is fused at 5 amps (red and black wires).
The dual‑fuse clean power harness connects directly to the engine cranking battery using two ring terminals. A 4‑pin connector
at the other end of the harness connects to the clean power T‑harness or to the thrust vector module (TVM), depending on the
application. Refer to the appropriate architecture diagram.
70755
90-8M0161677 eng MARCH 2021 © 2021 Mercury Marine Page 3C-3
Clean Power
4-Pin Clean Power T-Harness
IMPORTANT: A T‑harness must not be used in applications with an engine rigging center.
For some applications, the clean power harness connects to the 14‑pin data harness via a T‑harness. The T‑harness can be
inserted at either end of the 14‑pin data harness, according to whether the cranking battery is closer to the engine or the helm.
The T‑harness is optional on systems with a thrust vector module (TVM).
Application
1. All outboard and MerCruiser gas DTS systems
2. Joystick and electric steering systems without a rigging center
3. All triple‑engine and quad‑engine applications
Architecture
Connected at the T-harness
a - 14‑pin data harness
b b - Clean power harness
c - Clean power T‑harness
a c
72672
Connected to the TVM
a - 14‑pin data harness (from engine)
b c b - Thrust vector module (TVM)
c - Clean power harness
d - 14‑pin data harness (to helm)
a d
72673
4‑Pin Clean Power Harness with a Single Fuse
Overview
The 4‑pin, single fuse clean power harness has a single 30‑amp fuse at the battery. The harness connects directly to the
engine cranking battery using two ring terminals. A 4‑pin connector at the other end of the harness connects to the engine
rigging center or vessel interface panel (diesel applications).
72009
Application
The 4‑pin, single‑fuse clean power harness is used on applications that use a rigging center and on diesel applications that use
a vessel interface panel (VIP).
Page 3C-4 © 2021 Mercury Marine 90-8M0161677 eng MARCH 2021