That is what I don't know, and why I asked the question. I image the basic wiring would be the same, I guess I could follow out the other wiring and see where it goes. But I was planning to buy a wiring harness, which I can't find for the 6400. The bed is 14 feet long, not 8 like the pickup, so the wiring harness won't be long enough and I don't want to splice under the bed somewhere, I'd rather buy wire and run every wire myself.
