Mercury MerCruiser MCM 454 Mag MPI Service Manual page 368

SERVICE MANUAL NUMBER 23
5. If a voltmeter reading of 14.5 volts or above is now obtained, voltage regulator is faulty
Index
90-861326--1 MARCH 1999
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and must be replaced. If voltmeter reading is below 14.5 volts, inspect brushes and slip
rings for wear, dirt or damage. If brushes and slip rings are good, alternator is faulty
internally. Disassemble alternator and test components, as outlined under "Alternator
Repair," following.
a - Ground
b - Brush / Regulator Assembly
c - Brush Terminal
d - Jumper Wire (Solder Connection Ground)
a
d
c
b
CHARGING SYSTEM
72971
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