I'm plugged into 30amp service. The light fixtures bear a warning label that says use only 12v lamps type 912 or 921. I removed one of the lamps, brought it with me and bought the identical bulb (912). The fuse box is arranged as usual, power hogs on their own fuses, everything else arranged by room on 15 amp fuses. These light fixtures are on opposite ends of the trailer, and every other appliance, electrical outlet, and type of light fixture works without a hiccup. The only visible wiring I find anywhere in the trailer is in the front basement compartment, powering the jacks.