Hyundai 20G-7, Service Manual

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3-10
TROUBLESHOOTING
Charging system defect is almost caused by lack of pan belt
tension and faulty function of wiring, connector, and voltage
regulator.
One of most important thing during troubleshooting of charging
system is determining the reason between overcharging and
lack of charging. So, prior to inspection of alternator, check the
battery for charging. Faulty alternator causes the following
symptoms.
1. Faulty battery charging
1) IC regulator fault(Short circuit)
2) Field coil fault
3) Main diode fault
4) Auxiliary diode fault
5) Stator coil fault
6) Brush contact fault
2. Overcharging : IC regulator fault(Short circuit)
Other faults such as voltage adjusting problem except above
symptoms rarely happen.
Refer to the following troubleshooting table.
Symptom Remedy
With ignition switch ON,
charging warning lamp
does not illuminate
Fuse cut off
Bulb burnt out
Loose wiring connection
Bad connection of L-S terminals
Replace
Replace
Retighten
Inspect and replace wiring,
Replace voltage regulator
Possible cause
With the engine started,
warning lamp is not
turned off (Battery needs
often charging) Loose or worn drive belt
Fuse cut off
Fuse link cut off
Faulty voltage regulator or alternator
Faulty wiring
Corrosion or wear of battery cable
Correct or replace
Replace
Replace
Inspect alternator
Repair
Repair or replace
Overcharged
Faulty voltage regulator (Charging warning lamp illuminates)
Voltage detection wring fault
Loose or worn drive belt
Loose wiring connection
Short circuit
Fusible link cut off
Ground fault
Faulty voltage regulator (Charging warning lamp illuminates)
Battery out
Replace
Replace
Correct or replace
Retighten
Repair
Replace
Repair
Inspect alternator
Replace
Battery is discharged
CHARGING SYSTEM