Page 91 - REPOWER REFERENCE GUIDE (2020)

Engine Harness

Use the power trim adapter harness for the single helm harness connection on the remote control to the power trim pump.

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Power trim adapter harness

For dual helm installation, use a power trim extension harness from the upper and lower helm to a Y‑harness.
An adapter harness connects the Y‑harness to the power trim pump.
Neutral Safety Switch
Quicksilver remote controls for mechanical shift (cable) models are equipped with a microswitch to prevent accidental starting
in gear. Do not remove this switch from the remote control.
Lanyard Stop Switch

Purple and purple/white wires are connected together through a normally closed stop switch only with a MerCruiser remote
control.
When the lanyard is pulled and the switch is tripped, the circuit is opened and the power to the engine, ECM, or ignition system
is interrupted and the engine is shut off on MerCruiser remote control equipped boats.
If a lanyard stop switch is not used, or an E‑stop switch is used, these two wires must be plugged together for the engine to run.
Optional E‑Stop
The E‑stop lanyard switch connection is used on Mercury outboards and can be used on MerCruiser MPI engines.
The black and black/yellow wires are connected together through a lanyard switch that is normally open. When the lanyard is
pulled and the switch is tripped, the circuit will close and ground the ECM to shut the engine off.
When this connection is not used, the wires should be kept separate and capped.
Warning Horn
The audio warning horn and connections are included with the Mercury harness assemblies. (Another horn is also supplied with
the engine for those using custom wiring systems.)
Accessory Relay Connection
The 14‑pin wiring system is able to provide up to 15 amps of accessory power to the helm through the purple wire (key
controlled) or the red wire (constant on) circuit. This harness is fuse protected on the engine with a 15‑amp fuse on the engine.
If the fuse is blown, the engine will not start or continue to run.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 4D-11