2002 GMC Truck Glow plug controller

2002 GMC TRUCK
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BUSMECHANIC
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Electrical problem
2002 GMC Truck 87000 miles

I have a 2002 GMC 3500 bus with a 6.5l diesel I have changed the glow plug controller and I still don't have power going to the glowplugs it is a emissions style controller I have power at the main stud power at the yellow signal wire with key on ground on the black signal wire nothing on the blue and weak ground and the pink signal wire!
Jun 25, 2009 at 12:14 PM
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MICKEY-D
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You could have a poor ground from battery to engine, and engine to frame, and firewall. the grounds are very important in this system. One or more shorted glow plugs could create a problem also. Pull the glow plugs out and test them.
Dec 31, 2009 at 11:52 PM