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I'm working on an '02 f-350 and the tail lights, turn signals and fender markers stoped working. Trailer functions work and the flashers/ emergencies and brake lights work. How can that be unless the PCM controls it? All connections look good. Any ideas? Joseph
 

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No the PCM doesn't have any controll over those lights.

Trailer turn signals work and not the ones on the bed?
 

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Might sound like a stupid question, does the truck have a Light Control Module?

Not use if it applies, just sounds like a similar issue I had with a Crown Vic a couple of years ago, ended up being the LCM.
 

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I'm working on an '02 f-350 and the tail lights, turn signals and fender markers stoped working. Trailer functions work and the flashers/ emergencies and brake lights work. How can that be unless the PCM controls it? All connections look good. Any ideas? Joseph
^ check the GEM
 

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< pissed off pumkin.
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Fuses, and GEM. Also sometimes called a body control module, or BCM.

Dan
 
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