Just bought a teardrop trailer, with trailer hooked up remote for power locks will not work & ac continues to run with ignition off, ac stops when I unplug trailer. I tow boats all the time without issue, even boats with trailer brakes. I bought the trailer from an individual that towed with a Cadillac & never had a problem. Is this a LC problem? I called the trailer manufacture but they had never seen this. They did say possible voltage regulator on the truck. Help appreciated.