D439E Service Manual 3. Engine Electrical System (D439E)
129
Troubleshooting
Alternator
Troubles Possible causes Corrective action
Fuse is broken. Replace the fuse
Bulb is broken. Replace the bulb
Loose wiring connection Retighten the loose connection
Charge warning lamp is
not turned on when
ignition switch is ON
state.
Wrong connection of L-S terminals
Check and replace wiring or
replace the voltage regulator.
Drive belt is loose or worn. Replace the drive belt
Fuse is broken. Replace the fuse
Fusible link is broken. Replace the fusible link
Voltage regulator or alternator is defective. Replace the alternator
Wiring is defective. Repair or replace the wiring
Charge warning lamp
does not turn off even
after the engine is
started. (When battery
needs to be charged
frequently).
Battery cable is corroded or worn. Repair or replace the battery cable
Voltage regulator is defective (charge
warning lamp is on)
Replace the voltage regulator
Battery is overcharged.
Defective of voltage sensing wiring Replace the wiring
Drive belt is loose or worn. Replace the drive belt
Wiring connector is loose or circuit is
short.
Retighten the loose connection or
Repair the wiring.
Fusible link is short. Replace the fusible link
Poor grounding Repair
Voltage regulator is defective (charge
warning lamp is on)
Check the alternator
Battery is discharged.
Battery is exhausted. Check the battery
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