Anything we say is only a guess. But here's how to find the fault.: Have you changed anything? Using a voltage meter or something to indicate electric power... Start from the truck connection then the trailer terminal, then the lights. Electricity isn't hard. It's very much like water plumbing. Start from the source and look for the blockage. Remember, like water plumbing, you need a line for the waste. In trailer electrics, this is the ground. |