I know when sometime along the way I will have to replace the 59 year old wires in my 49 two ton. There is missing covering and some corrossion. I did a search on the site for info, but didn't find out much. I did find a post that said that the light trucks and the heavy trucks were the same except for the tail lights and license plate light of course. I looked at some of the on line parts sources and the wiring harness ranges from about $130 to as much as $600, but not a lot of info. Not sure what you get for your money. Anyone buy a harness they would recommend or did you just replace the wires individually yourselves? Not going to buy it too soon, but lining up sources.