I bought a wiring diagram from LMC, when I bought two wiring harnesses. One harness for the lights and one for the engine.
The wiring diagram didn't cover the engine wiring, at all. I called them to complain, but it did no good. The people who take the orders don't know much about our trucks....only how to get our money.
You may want to drop an email note to
www.wiringharness.com. They build correctly-coded harnesses for our trucks, with the correct fasteners, plugs, connectors, etc. Plus, they're easy to talk to if you call them. Sure made the difference for me. They build beautiful stuff!
The actual name of the company is: M&H Fabricators, Inc.