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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
ALTERNATOR ELECTRICAL SYSTEM
ELECTRICAL SYSTEM
28 ALTERNATOR
If a problem occurs in the charge system, check the
following abnormal conditions to locate the cause of the
problem. Only when inspection cannot be conducted
on the alternator installed on the engine, dismount the
alternator for inspection and repair.
28.1 On-vehicle inspection
28.1.1 Cautions in handling
Handle the alternator carefully. Incorrect handling can
result in alternator damage and malfunctions.
1. Do not connect the battery cables in reverse. Note
that the negative cable is a grounding wire.
2. Do not use a high-voltage tester such as a megger.
3. When charging the battery, disconnect the cables
from the battery terminals.
4. Do not disconnect the lead wire from terminal B of
the alternator while the engine is operating.
5. Do not ground terminal B of the alternator since it
is constantly applied with battery voltage.
6. Do not short or ground terminal L. (unit with
integrated IC regulator)
7. When using a steam cleaner, do not allow steam to
directly contact the alternator.
Overcharging
Voltage regulator adjustment value is
high.
Faulty battery.
Overdischarging
Voltage relay adjustment value is low.
Faulty alternator output.
Power consumption is extremely high.
Special load is used.
Faulty wiring.
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