73-87 Chevy _ GMC Trucks > Crew Cabs

clearance light help

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bigchevyc30:
ok so my clearance lights on the top of my dually have stopped working and i replaced the bulbs and they still wont work can anyone tell me which fuse could be blown or where a inline one would be located for the clearance lights cause my dually just doesnt look the same at night with out the top lights. if you know what i mean the truck looks its best at night

Jason S:
Have you checked the ground on the lamps? 

bigchevyc30:
where would the ground be cause i took off the edge lights and it just looked like on the driver side they went down the door support

Irish_Alley:
dont know about yours or our clearance lights but some lights ground them self with the screws or base. but since all the lights are out i done see there only being one ground i would think its the power, and since they are activated with the headlight switch/ parking lights then i would check that first then try to trace the power wire from the lights to the switch to see if there is 12v at both ends.

Jason S:
Okay, I pulled my 1979 GMC shop manual (close as I could get) and it shows the clearance lights as having a ground clip to the body under the light.

Later model trucks had a dedicated ground that ran back down the pillar, which if it was not grounding would make all the lights go out..

Presuming 1979 and 1980 were the same setup, the power wire is shown to route through the A-pillar and plug directly into the headlamp switch. The best that I could find is that the clearance lamp power wire is brown with a spade terminal to go into the top of the headlamp switch.  I don't see anything showing a fuse inline or otherwise for the clearance lamps. 



If your park and tail lamps are working, then check the connection at the headlamp switch.  It may be the lead from the switch or the switch itself.

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