STARTING AND ELECTRICAL SECTION - 7
Page 6 / 22 90-899883183 DECEMBER 2007
IMPORTANT: For dual helm installation, both key switches used must be modified to operate
independently.
IMPORTANT: Cutting the black / yellow stripe wire disconnects the E stop circuit incorporated in
the the key switch.
• To modify the key switches, cut the black / yellow stripe wire at each key switch and cover
both open wire ends with heat shrink tubing.
Typical key switch
a - Black/yellow stripe wire
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 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.
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
TRIM SWITCH
The trim switch connection is only used on Mercury outboards.
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