I've aquired a 73 F250. The previous owner tore off the stock bed and put on an old home made Flatbed. He cut all the brake/tail/signal light wires just about 2 feet from where they were connected to the lights on the original bed. I'd like to connect these to the existing lights on the flatbed but I'm not sure which wires go to which lights. Even with a circuit tester it's confusing. Get some really strange results when using the tester and a little logic. Does anyone know where I might find an online diagram (Color coded) that would show me which wires were which? Thanks much.