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 TM 10-3930-644-14&P
I. ELECTRICAL SYSTEM (CONT)
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Ammeter shows
Inoperative alternator.
Repair or replace.
discharge dur-
ing engine op-
Faulty regulator controls.
Replace regulator.
eration.
Shorted circuit.
Check for faulty circuit and repair.
Fan belt loose or broken.
Adjust or replace belt.
Excessive bat-
Shorted batter, cell.
Replace.
tery water
usage.
High regulator setting.
Adjust.
Starting motor
Broken connections.
Reconnect or replace wires.
failure.
Faulty switches.
Check ignition switch or starter button.
Battery dead or low charge.
Replace or recharge battery. Check for low
regulator setting.
Commutator dirty.
Clean.
Worn brushes.
Replace.
Broken drive.
Replace.
Ammeter shows
Shorted circuits.
Trace wiring for shorts.
heavy discharge
with- engine
Defective voltage regulator.
Inspect for closed contacts. Adjust or replace
stopped.
regulator.
Defective ammeter.
Replace.
Ammeter shows
Loose alternator drive belt.
Readjust.
rapid fluctuate-
tion.
Shorted or loose connections.
Trace wiring. for breaks or looseness.
Dirty, loose, or worn alternator
Clean and lighten brushes. Replace If worn.
brushes.
Defective alternator.
Repair or replace.
Voltage regulator out of adjust-
Readjust.
ment.
Horn does not
No current to horn.
Check for broken wire or dead battery.
blow.
Faulty horn button.
Check for faulty ground or replace horn button.
Defective horn.
Replace.
Defective horn relay.
Replace.
Hon blows
Grounded horn wire.
Eliminate ground. Check for frayed wire.
continuously.
Shorted horn.
Replace horn.
Defective horn button.
Replace.
Faulty relay.
Replace.
2-115
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