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Inspect circuit,clean,and tighten

connections.Repair or renew faulty wiring

Faulty external charging circuitWarning light

flashes

intermittently

Inspect,repair,or renewFaulty rotor,slip rings,or brushes

Check and renewDefective diodes

Check and adjust tension or renewLoose or worn alternator drive beltWarning light

is lit during

operation

Inspect and test circuitry,Repair or renewAlternator’s internal connections

Check and renewDefective rectifier or rectifying

diodes

Check and renewDefective starter

Check and renewFaulty rectifier or rectifying diodes

Check and renewFaulty starter

Check and renewDefective voltage regulatorWarning light

is normal but

battery is

discharged

Check and renewFaulty rectifier or rectifying diodes

Check and renewDefective monitor and warning unit

Inspect and repair or renewFaulty rotor slip rings or brushes

Inspect system,clean and tighten

connections

Faulty external charging circuit

connections

Warning light

dims

Check and repair or renewDefective alternator

Inspect system,tighten connections and

repair or renew faulty wiring

Loose connection or broken cable in

charge system

Check and adjust belt tension or renewAlternator drive belt is slippingIntermittent

or low

alternator

output

CountermeasuresCausesProblems

10-18

TYM T390 Service Manual

Other manuals for TYM T390