K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Volt Meter Gauge: Testing and Inspection
Alternator Indicator Lamp
DELCOTRON CHARGING SYSTEM
Fig. 1 Charge Indicator Lamp Wiring System. Delcotron Charging System
Before performing diagnostic procedures, ensure system wiring is good, alternator belt is tight, and battery is fully charged.
1.
Check drive belt for wear and proper adjustment.
2.
With ignition switch On and engine Off, charging indicator lamp should be On.
3.
If indicator lamp is not On, disconnect wiring harness at alternator. Ground ``L'' terminal using a fused five amp jumper wire. Refer to Fig. 1 for
wiring schematic of alternator.
4.
If lamp lights, replace alternator. If lamp does not light, check for a open between the grounding lead and the ignition switch. Reconnect wiring.
5.
With switch On and engine running at a moderate RPM, lamp should be Off. If not stop engine, turn switch On, then disconnect wiring harness at
alternator.
6.
If lamp goes out, replace alternator.
7.
If lamp stays On, check for a grounded ``L'' terminal wire in harness.
