C 10 1/2 Ton Pickup 2WD V8-379 6.2L DSL VIN C FI (1982)
FIGURE 1 - G.P. CONTROL SWITCH TERMINAL LOCATIONS
GLOW PLUG CONTROLLER CHECK FOR PROPER FUNCTION
Engine Cold, Ignition Switch Off
1.
First connect a VOM between the negative side (blue wire) of the power relay coil and ground.
CAUTION: Do not short the positive terminal to any metal object.
2.
Monitor the VOM when the ignition switch is turned on. Turn the ignition switch on.
3.
The VOM should read about 2 VDC for approximately 4 to 10 seconds, depending on the engine coolant temperature.
NOTICE:
If the engine is hot, you may get a continuous voltage reading of about 12 VDC (the battery voltage).
