Table 5-4. Troubleshooting - Direct Support (Con't).
TEST OR INSPECTION
ALTERNATOR AND CHARGING CIRCUIT (Con't)
17. OVERCHARGED BATTERIES (Indicated by high water usage) (Con't).
Test for high voltage regulator setting or faulty voltage regulator (para 7-91 ).
Adjust voltage to proper setting (para 7-91). Replace voltage regulator if voltage setting
cannot be lowered,
Perform "full field" test to determine if problem is in alternator or voltage regulator (para 7-91).
If voltage does not increase noticeably (.3V or more) during test, alternator is faulty and
should be repaired or replaced.
if voltage increased noticeably during test in Step 1, the problem is either in the diode trio or the
voltage regulator. Remove diode trio and test for proper functioning (para 7-91).
Replace diode trio if test shows one of the diodes is faulty.
Remove and inspect voltage regulator. Check for printed circuit path that has burned open
Replace voltage regulator.
19. SHORT LIFE OF VOLTAGE REGULATOR.
Check that alternator and battery connections are correct. Reversing polarity, even momentarily,
will damage the voltage regulator.
Notify operator and unit maintenance personnel about proper procedures.
Inspect voltage regulator before installation for defects or damage in shipment or handling.
Replace voltage regulator if damaged or defective.
Tighten mounting bolts and alternator drive pulley.
Check for worn or sticking bearings by removing alternator drive belt and rotating alternator by
Repair or replace alternator.