I just bought a '54 3/4 ton. One of the break lights works on and off and the reverse lights don't work at all. I looked at the wiring under the truck and it appears to be spliced in a few places. I need a new wiper motor anyway so I'm thinking of converting to 12 volt. This is my first old truck and I've got no wiring experience. How hard/costly/time consuming would it be to completely rewire this vehicle and convert to 12 Volt?