I just purchased a 1999 Palomino Yearling, the thing needs a lot of work. We cannot figure out why the 12V electrical does not work. The battery is good but even when we have the camper plugged into the house, all of the 12V lights do not work (internal and external lights) but all the electrical outlets work perfect. One of the fuses does keep blowing repeatedly. We tried tracing the wires from that fuse to see if there is a short but the wires go out the flooring and into the frame under the camper, we don't know where they came out. What can we do?