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Q: tralier coupler on 2002 GMC Sierra 1500

getting no power to my factory trailer coupler to make my boat trailer lights work...is there a fuse somewhere?
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Which lights are not working - all of them? There is not one fuse that would take out ALL of the trailer lights. If everything is dead there may be a problem where the trailer harness plugs into the junction block at the rear of the truck.
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