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Hello Dewey, I can think of three reasons that could cause your problem. The truck pigtail is improperly wired, the trailer pigtail is improperly wired, or the trailer wires are contacting each other that they shouldn't.
You need a "test light". Then you turn on the circuit you want to wire in, tail lights, brake lights, blinkers and poke around the back of your light sockets until the test light comes on. Then you splicew into that wire and run it to your plug in. If you don't know which wire is what on the trailer, hook it up and with the wire fastened into the truck harness, try it on the trailer harness wires until you get the proper lights working. Process of elimination. Hope this helps.
In case you weren't aware, you can buy an adapter that plugs into your harness in the area in front of rear bumper, up under vehicle, that will do all of what your trying to accomplish, with a whole lot less work, and they are not that expensive, plus you don't have to touch wires in behind panels etc. Does that sound good to you, or do you still want other instructions? Also, does this trailer have brakes that need to be hooked up as well in this plug? Sorry for all the questions but, want to make sure we get it right the first time. If no brakes on trailer, all you need is right signal, left signal, & running light working, and we need to know if your brake lights are same bulb as your signal lights.
taillights on what? Everything - needs to be grounded is the FIRST thing to remember. Try etrailers.com for parts or tech assistance or Google "Hoppy" trailer light kits. Good luck
Check ground wire to the trailer. On the vehicle and the trailer. Make sure you have a good ground as lighting will seek any path for ground which will feedback and cause lights to act really weird.
I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired--- brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.
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