Problems Causes Countermeasures
Intermittent
or low
alternator
output
Alternator drive belt is slipping Check and adjust belt tension or renew
Loose connection or broken cable in
charge system
Inspect system,tighten connections and
repair or renew faulty wiring
Defective alternator Check and repair or renew
Warning light
dims
Faulty external charging circuit
connections
Inspect system,clean and tighten
connections
Faulty rotor slip rings or brushes Inspect and repair or renew
Defective monitor and warning unit Check and renew
Faulty rectifier or rectifying diodes Check and renew
Warning light
is normal but
battery is
discharged
Defective voltage regulator Check and renew
Faulty starter Check and renew
Faulty rectifier or rectifying diodes Check and renew
Warning light
is lit during
operation
Loose or worn alternator drive belt Check and adjust tension or renew
Defective diodes Check and renew
Faulty rotor,slip rings,or brushes Inspect,repair,or renew
Defective starter Check and renew
Warning light
flashes
intermittently
Faulty external charging circuit Inspect circuit,clean,and tighten
connections.Repair or renew faulty wiring
Alternator’s internal connections Inspect and test circuitry,Repair or renew
10-19
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