My po bypasses the original wiring with extension cords and a surge protector in place of the fuse box. The 12 volt
system was ignored and wired up the rear lights with a flat4 utility trailer harness then used conduit to run the wire from the bumper to the tail light on the outside. All of the interior lights were vanity bars hard wired into extension cords. The ac was drained into the sink. Entire pieces of rotten subfloor were covered with bondo, drilled over plywood, and in one spot mortar I think. Mounds of caulk, duct tape and not so "great stuff".