Mercury MerCruiser Service Manual page 340

Instrumentation and Controls
IMPORTANT: The key switch at the station being used should be the only key switch in the run position. If both station key
switches are in the run position the engine cannot be turned off with the key switch and the lanyard stop switches will not
function.
• If a momentary stop switch is added, the stop switch will override the key switch and the engine will shut off when the stop
switch is activated.
• If a stop button is desired on a dual helm installation, the black wire and black/yellow stripe wire can be clipped at the key
switch and connected to a normally open momentary button switch. Any marine momentary push button, rocker style
switch or toggle switch could be utilized to create the stop switch. Label the switch on the dash after installation.
• To install a momentary stop switch:
a. Cut the black wire at the key switch and cover the cut wire at the key switch with heat shrink tubing.
b. Install an eye terminal on the black wire from the connector side. Cover cut wire ends with heat shrink tubing.
c. Install an eye terminal on the black/yellow stripe wire from the connector side. Cover cut wire ends with heat shrink
tubing.
d. Connect the black wire and the black/yellow stripe wire eye terminals to a momentary switch.
a
b
Trim Switch
The trim switch connection on the helm harness is only used on Mercury outboard remote controls.
MerCruiser models require a separate trim harness from the trim control to the power trim pump connection. A Y‑harness is
available with adapters to connect the dual helm power trim harnesses together to connect to the transom harness. DTS
models do not need the separate trim harness.
Use the power trim adapter harness for the single helm harness connection on the remote control to the power trim pump.
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 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.
Page 4D-10
d
c
25137
Power trim adapter harness
© 2016 Mercury Marine
Typical key switch with momentary stop switch for MPI models
a - Black wire with eye terminals
b - Black/yellow stripe wire with eye terminals
c - Eye terminals connected to momentary switch
d - Momentary switch
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90-8M0099748 eng DECEMBER 2015