Slave Solenoid Identification; Types; Standard Type Slave Solenoid; Switch Type Slave Solenoid - MerCruiser GM4 Service Manual

Slave Solenoid Identification

Types

There are two types of slave solenoids ("standard" or
"switch") used on MerCruiser engines. These en-
gines use a standard type solenoid; do not substi-
tute a switch type solenoid. The other engines use
a slave solenoid to energize the starter motor sole-
noid. Some model engines use the small terminal on
the "switch type" solenoid for ignition by-pass during
the starting of the engine. Because of this, be sure to
use correct type of slave solenoid for replacement.

Standard Type Slave Solenoid

a
c
OFF OR RUN POSITION
a
c
STARTING POSITION
a - From Key Switch (12 Volts In Start Position)
b - To Ground
c - 12 Volts From Battery
d - 0 Volts From Starter
e - 12 Volts To Starter
Index
4A - 6 - STARTING SYSTEM

Switch Type Slave Solenoid

c
b
d
STARTING POSITION
a - From Key Switch (12 Volts in Start Position)
b - Mounting Bracket and Ground
b
c - 12 Volts from Battery
d - 0 Volts To Starter
e
e - 0 Volts To Ignition Coil
f - 12 Volts To Starter
g - 12 Volts To Ignition Coil
74581
b
a
OFF OR RUN POSITION
b
a
c
e
d
g
f
74582
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