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MAINTENANCE
© 2020 Indmar Marine Engines
the alternator to overheat and fail. It is critical that all electrical
connections are clean and tight.
These types of failures are not
covered by Indmar’s Limited Warranty.
3.
POSITIVE CIRCUIT FAULTS:
A bad connection or open circuit
between the alternator output terminal and the positive battery
terminal will force the charging current to follow a parallel route
through the diode trio and out of the alternator. This heavier
than normal current flows though the diodes and will cause
them to overheat and fail. Consequently, if you have replaced
an alternator because of bad diodes, and the replacement fails
for the same reason, there is likely a bad connection between
the alternator BAT (B+) terminal and the positive side of the
battery circuit. Have your dealer do a voltage drop test to check
the entire circuit. Also, never remove a battery cable when the
engine is running. This will cause the diodes to overheat and
fail. Never use the alternator to bring an undercharged battery
to a fully charged condition. The excessive current draw can
overheat the diodes and cause them to fail.
These types of
failures are not covered by Indmar’s Limited Warranty.
4.
NEGATIVE (GROUND) CIRCUIT FAULTS:
The primary
mount of the alternator serves as the negative ground for the
alternator. This connects the alternator to the engine block
which is in turn connected to the negative post of the battery
via a ground stud on the engine. The ground stud on the
engine holds all of the wiring harness grounds and battery
ground with one nut and it is known to occasionally become
loose, disconnected or corroded. When the alternator loses
its ground, it can become damaged as it surges and could
cause catastrophic damage to the voltage regulator within the
alternator. It is important to keep the ground wires, stud and
nut clean and tight and check it often.
These types of failures
are not covered by Indmar’s Limited Warranty.
5.
OVERLOADED:
Never use the alternator to bring a dead
or undercharged battery to a fully charged condition. The
excessive current draw can overheat the diodes and cause
them to fail. If you have a dead battery, use a battery charger
instead. If you experience a battery that is constantly being
discharged, look for the cause, such as bad battery or
aftermarket accessories, or defective electrically operated
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