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Factory fog light issues

SarahsGMC

By SarahsGMC
in Ask A GM Technician

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SarahsGMC Senior Enthusiast

SarahsGMC

Posted
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Both fog lights weren't working bulbs fine fuses fine so I hooked up a multimeter on driver side light plug it got up to .51 amps I crawl out from under truck and magically my passenger side is on but driver side still off... Now there's ice all over the backing of the lights and one of the prongs on the light seems to have a little rust could it be that? But that doesn't explain why magically the one light came back on. Could there be a wiring issue somewhere else? I'm only assuming this is a weather issue I just want to cover all my bases.

 

 

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TimmyG Senior Enthusiast

TimmyG

Posted
Posted

I would guess something is loose/dirty

 

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Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

I am not sure why you would measure current flow(amps). Chances are you have a bad connection on the right side. That bad connection can be in one or more of the connections in the wires going to that fog light, as well as the socket itself, or even inside the actual bulb. You may find that the bulb is blown, but, it is only a break in the filament, and by shaking the bulb, it makes a connection, and "welds" itself back on, completing the circuit.

 

You should be testing for voltage at the connectors, not amps, or checking for continuity with either a continuity tester or an ohm meter. Disconnect battery before testing resistance with an ohm meter (or remove power from circuit).

 

Any time you get all lights in the circuit going out, it is not likely the bulbs. It is likely some single item that effects both bulbs at the same time. Try checking charging voltage as well. It may be overcharging, that will take out bulbs with very little symptom.

SarahsGMC Senior Enthusiast

SarahsGMC

Posted
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Posted

well i pulled the working bulb and plugged it into the driver side and it worked so it looks like its a bulb issue, they look to be factory bulbs so this doesnt surprise me

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