STARTING AND ELECTRICAL SECTION - 7
Page 8 / 22 90-899883183 DECEMBER 2007
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 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
Accessory relay kit 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.
An accessory relay kit connected to this location can provide up to 40 amps of accessory power.
The key switch will power‑up the relay in the "accessory" position and "run" position.
Relay With Power Harness
ADDITIONAL RELAY KIT
An additional 40‑amp relay kit can be installed and connected to a junction box at the dash gauge
connection location. This location will power up with the key in the "run" position only.
The use of both relay kits will result in a maximum of 80 amps of key controlled power at
the helm. This multiplies out on dual engine and dual helm applications as long as the power wires
to the helm are adequate to carry the total current demand.
Accessory relay harness
GAUGE CONNECTION
The gauge connection of the boat harness connects to the analog gauge harness.
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