You may have a short in the trailer wireing that caused the 15 amp fuse in the fuse box under the hood that is for the trailer turn lights,unplug the trailer and see if it still blows,if so the problem lies with the truck,if it does'nt blow the problem lies with the trailer.Beyond that i will need your response to help.
If they camper was wired for an older/other make of truck it might be different check to see if the yellow(left side turn/brake) wire maybe connected or crossed with the green(right turn/brake) wire,also see if the plug in wiring under the rear bumper is a stock plug in or if some one tried to go cheap and use"scotch-locks" on the tail light wires and crossed something under there,the parts store sells a plug in tester for your truck's particular plug that will tell you if the truck has the issue or if it's the camper,also check the ground,hope this helps,and good luck
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