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Hi my name is Robert.....
I would start by checking the plugs on each side, check the trailer side first, pull the plug and make sure all the wires are tight and not touching or corroded, if a wires was touching another inside the plug it could create a short, I would also check the truck side as well. Make sure the main ground is also clean and tight, then I might check your connectors at the lights or everything on that circuit, make sure all the wires are water tight and not loose. Many times the problem can be at the tow plug it's self.... Hope this helps some... Robert
Hi... Was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me...
The only way to do that is to ohm out each wire with a volt meter, you would need a long jumper wire with alligator clips you would hook one probe to the wire and then clip the other wire to the other probe and then go to where the wire is and touch it and see if you have continuity through the wire.... Robert