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Found 1 result

  1. Bkosmo
    I have a 2002 gmc sierra 2500hd 8.1 with 7pin trailer plugs in the bed and at the bumper. There is no 12volt power to either plug for top off of trailer batteries or 12 volt trailer accessories...ie winch. I know that gmc has 2 12volt posts at the fuse box and 40 amp fuses to those corresponding posts ( left post controlling the 12v trailer charging and the right post controlling trailer brakes). I have power at both posts, both fuses are good and the trailer brakes work but still no 12v power at either plug. Any one have any suggestions?
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