Page 81 - REPOWER REFERENCE GUIDE (2020)

Engine Harness
Repower Considerations

Section 4D - Engine Harness

Table of Contents

Wire Color Code Abbreviations......................................... 4D-2 Power Trim System with an Outboard Remote
Engine Harness................................................................. 4D-2 Control.................................................................. 4D-22
Boats Manufactured 1985 and Prior...........................4D-2 MerCruiser Remote Control Only to the Harness
Boats Manufactured 1985 and Later—10‑pin, 14‑pin Assembly (Control Harness Assembly)................ 4D-23
Engine Harnesses...................................................4D-7 Transom Harnesses........................................................ 4D-23
14‑Pin Wiring and Rigging for Mechanical Engines...........4D-8 New Transom Harness Ground Connection.............4D-23 4
Overview.....................................................................4D-8 Sterndrive Carbureted Engines—Transom Harness
Serial Number Identification....................................... 4D-8 866727T01............................................................4D-24 D
14‑Pin Features and Benefits.....................................4D-8 Sterndrive MPI V6 and SB Engines—Fuel Tank
Applications................................................................ 4D-9 Harness 84‑864218.............................................. 4D-25
Boat Harness Installation Guidelines—MPI Sterndrive..... 4D-9 Sterndrive MPI V6 and SB Engines—Speed and
Boat Harness Connector to Engine............................4D-9 Steering Input Harness 84‑863736T.....................4D-25
Key Switch Connector................................................ 4D-9 Sterndrive MPI V6 and SB Engines—Speed Input
Trim Switch...............................................................4D-10 Harness 84‑863737T............................................ 4D-25
Neutral Safety Switch............................................... 4D-11 Sterndrive MPI V6 and SB Engines—10‑pin Transom
Lanyard Stop Switch.................................................4D-11 Harness 84‑863931A1..........................................4D-26
Optional E‑Stop........................................................ 4D-11 Sterndrive MPI V6 and SB Engines—14‑pin Transom
Warning Horn........................................................... 4D-11 Harness 865677T02............................................. 4D-26
Accessory Relay Connection....................................4D-11 Sterndrive 496 Mechanical Engines—Transom
Additional Relay Kit.................................................. 4D-12 Harness 865677T01............................................. 4D-27
CAN P (CAN 1) Connections (SmartCraft Only)...... 4D-12 All Sterndrive DTS Engines—Transom Harness
General Repower Information.................................. 4D-13 865677T01 and Trim Adapter Harness 865744T01
Repower of a 10‑Pin Boat with a 14‑Pin Engine..............4D-13 ..............................................................................4D-27
14‑Pin Wiring Diagrams...................................................4D-14 4.5L/6.2L Transom Harness.....................................4D-28
Helm Mechanical......................................................4D-14 4.5L/6.2L Transom Harness Wiring Diagram.................. 4D-29
Boat Wiring...............................................................4D-15 Transmission Harnesses................................................. 4D-30
Non‑DTS Single‑Station Instrumentation Installation Inboard Carbureted Engines—Transmission Harness
..............................................................................4D-18 866784T01............................................................4D-30
Analog Gauge Harness................................................... 4D-19 Inboard MPI Transmission Harness (except DTS)—
Drawing.................................................................... 4D-19 65769T01..............................................................4D-30
Diagram....................................................................4D-20 Inboard DTS Transmission Harness 865676T01..... 4D-31
4.5L/6.2L Remote Control Wiring Diagrams....................4D-20
Power Trim System with a MerCruiser Remote
Control.................................................................. 4D-21

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 4D-1