I've check all fuses, all is good. lights work on truck, but are not on any trailer that I hook up to the truck. I've followed the wiring up to the fuse box, I find no power any where. It got me stumped
check the ground wires for the rear of the truck ,when there's no strain on the wires or the light system they will work right but it takes more power to operate the lights when their hooked to a trailer,i run across this problem a lot especially on some of the dodge rams,and its real hard to find sometimes,i have looked over this problem several times before and then went back over it and find it,good luck.
