e89. ELECTRICAL SYSTEM DOES NOT MAINTAIN A CHARGE (CONT)
POSSIBLE PROBLEMS
KNOWN INFO
2.
Does engine oil pressure
indicator light go out before
the OIL PRESS gage reaches
20 PSI?
YES
NO
TEST OPTIONS
REASON FOR QUESTION
Visual Inspection
Engine oil pressure indicator
light illuminates.
OIL PRESS gage operates.
Engine starts.
Alternator belts OK.
Battery(ies) OK.
Faulty engine oil pressure
switch.
Faulty relay K11.
Faulty dashboard cable
assembly.
Faulty engine control cable
assembly.
Faulty alternator ground strap.
Faulty alternator.
Faulty voltage regulator.
Faulty 100 AMP alternator to
reverse polarity relay 12 vdc
cable.
Faulty 200 AMP alternator to
terminal block 12 VDC cable.
Faulty 100 AMP alternator to
reverse polarity relay 24 VDC
cable.
Faulty 200 AMP alternator to
terminal block 24 VDC cable.
If oil pressure indicator light
remains illuminated, oil
pressure switch is faulty.
Replace engine oil pressure
switch (para 7-40).
TM 9-2320-365-20-1
2-1012 Change 1
