K 20 3/4 Ton Pickup 4WD V8-379 6.2L DSL VIN J FI (1983)
SKETCH 2 - WIRING HARNESS
Procedure
1.
Wait for a minimum of 15 minutes, or sufficient time for the controller to cool off.
2.
With the key in the off position (engine stopped), check for battery voltage in the brown wire that goes from the alternator to the
glow plug controller.
3.
If a voltage is present, disconnect the brown wire from the alternator. Again, check for voltage in the brown wire. There should be
none. (If the key is "ON", a low voltage - approximately 3 volts - will be present).
4.
Turn the key on. If the glow plugs heat, the condition was with the alternator.
