Direct Drive Starter Motor; Identification; Electrical Circuit Description - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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SERVICE MANUAL NUMBER 23

Direct Drive Starter Motor

The starter identification number is located as shown.

This is a general description of the positive current flow, from the battery and through the

system until the starter motor cranks.

The starter motor is designed to operate under great overload and produce a high

horsepower for its size. It can do this only for a short time, since considerable heat

accumulates and can cause serious damage. For this reason, the cranking motor

must never be used for more than 30 seconds at any one time. Cranking should not

be repeated without a pause of at least 2 minutes to permit the heat to escape.

90-861326--1 MARCH 1999

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Identification Number

Battery to the solenoid switch (on starter) (RED battery cable).

Solenoid switch to circuit breaker (RED).

Circuit breaker to wire junction (RED-PUR).

Wire junction to wiring harness plug (RED-PUR) terminal 6.

Wiring harness plug to 20 amp fuse (RED-PUR).

20 amp fuse to ignition switch terminal I (RED-PUR). At this point ignition switch is turned

Ignition switch terminal B to terminal S.

Ignition switch terminal S to neutral start switch (YEL-RED). NEUTRAL START

SWITCH MUST BE AT NEUTRAL POSITION.

Neutral start switch to wiring harness plug terminal 7 (YEL-RED).

Wiring harness plug to starter solenoid (small terminal) (YEL-RED). Also ensure that

black (small terminal) wire is grounded.

Starter solenoid is now "closed," completing circuit between large terminal (RED-PUR)

and other large terminal (YEL-RED), causing starter motor to crank.

STARTING SYSTEM

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