Mercury MerCruiser MCM 454 Mag MPI User Manual

CHARGING SYSTEM SERVICE MANUAL NUMBER 23
Page 4C-10 90-861326--1 MARCH 1999
5. If reading is between 6.0 and 7.0 volts, rotor field circuit probably is open. Remove regu-
lator and inspect for worn brushes or dirty slip rings. Replace brushes if less than 1/4
in. (6 mm) long. If brushes and slip rings are in good condition, disassemble and perform
rotor test as outlined under “Component Testing - Rotor” following.
72785
f
g
a
b
c
d
e
a-Excitation Wire - PURPLE
b-Sensing Wire - RED/PURPLE
c-Tie Bar
d-Voltmeter (0-20 Volts)
e-Ground
SENSING CIRCUIT
1. Unplug RED/PURPLE lead from voltage regulator.
2. Connect positive (+) voltmeter lead to red/purple lead and negative (–) voltmeter lead
to ground terminal.
3. Voltmeter should indicate battery voltage. If battery voltage is not present, check sens-
ing circuit (red/purple lead) for loose or dirty connection or damaged wiring.
72786
e
a
b
c
d
a-Output Wire - ORANGE
b-Excitation Wire - PURPLE
c-Sensing Wire - RED/PURPLE
d-Voltmeter (0-20 Volts)
e-Ground
Downloaded from https://needmanual.com/!
Index

Mercury MerCruiser MCM 454 Mag MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 454 Mag MPI
Category	Engine
Language	English