C 30 P/U 2WD V8-379 6.2L DSL (1985)
Glow Plug System Diagnosis (Part 3 of 3)
CAUTION: The glow plug relays are automatically controlled. Do not attempt to bypass the relay terminals of the controller as the glow plugs will be
damaged.
1. Inspect all system electrical connectors and ensure terminals are free from corrosion and that connectors are fully seated.
2. Inspect engine harness ground stud, ensuring wire end terminals are free from corrosion and that stud nut is properly tightened.
3. Inspect relay terminal lugs on controller, ensuring wire end terminals are free from corrosion and that nut are torqued to 3.9-5.1 Nm (35-45 in lbs).
4. If glow plugs function normally but glow plug lamp fails to light, inspect connections and bulb in instrument panel jumper harness and repair as
needed.
5. If system fails to operate properly refer to wiring schematic and diagnostic charts.
