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If it only happens when the trailer is connected then it is in the trailer. So do the interior lights work when the truck is disconnected and how is the battery in the trailer? If the lights don't work and the battery is dead you probably have a grounded power line in the trailer. Start looking for a frayed or pinched wire in the trailer.
Jim
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96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages,Dark Toumaline, add a leaf,Dale's TYMAR,and HX hose, downpipe, coolant filter with coolant eye
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