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1982 Oldsmobile Cutlass Calais 2D Coupe

1982 Oldsmobile Cutlass Calais
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June 24, 2012, 7:25 pm

Dave D
 

Question: Problem with headlight/parking light switch.

I have a 1991 Oldsmobile Cutlass Calais, 2.5 engine. The parking lights come on automatically when I start the engine. If I turn on the headlights or parking lights with the engine off, I hear a humming sound coming from the fuel tank. I still hear the humming sound even when I remove the fuse to the fuel pump which is located inside the tank. I have check all the lights including tail lights, stop lights, high and low beam - all work fine. The headlight/parking light switch is not difficult to replace. But before spending $70 on the part, I would appreciate your thoughts. Thank you for your assistance.


July 4, 2012, 2:30 pm

Elizabeth K
Expert Mechanic

My wiring diagram for the vehicle is not readable, but it sounds like there is a short between the ignition switch circuit, fuel pump circuit and headlight circuit. Since there's so many different parts involved, the trouble is most likely occurring at a major junction like the fuse box or relay center, or possibly the ignition switch. Looking at a wiring diagram and identifying all the circuits that are experiencing a problem would be the first step.


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