How much do you guys think is reasonable to pay for rewiring a boat trailer (21 foot Triton)? It has all of the existing wires run through the trailer, and all of the lights work......the dang thing blows a fuse(running lights fuse only) every time I hook it up to the truck. I have replaced everything I can get to, and cleaned up all visible connections....it has to be a bad wire somewhere, right? Ground wire problem???