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Does anyone have a diagram of the physical routing of the wiring? I am thinking about making my own harnesses and the current harnesses I have have been butchered, rerouted, and required a lot of patching to make them safe and useable. They is no good as models.

That's a tall order. The best thing is to go to the TMs for wiring. Look at TM 9-2320-212-20 pg 2-17

Thanks for your reply.

The TM shows the schematic, which I have used to rework the existing pieced-together harness. It would be helpful to know how the harness is routed from the firewall back and how the wires are routed to the rear lights and trailer plug. I know which wires go where, electrically, but not how they are bundled and routed.

Centaur,

Try TM9-840. There's no specific section on what you're looking for, but there are pics of the wire routing throughout the manual. I believe most of what you're looking for is in there.

regards,
bob

Wiring coming out of the left side of the firewall is for use on the left side of the engine and the left headlight and the horn.
Wiring coming out of the right side of the firewall is for the right headlight and on to the rear tailights, gas tank sending unit and trailer
plug. You'll probably have to splice in a wire for the license plate light. There is one wire on the right side that goes back to the brake light
switch by the master cylinder on the left side. That I know of, there's no wiring going to the rear along the left frame rail.
Hopefully there's still some clips for wiring along the inside of the right frame rail that previously held wiring.

Bottom line here is you do what you gotta' do with the materials available. A multi-meter and a test light will come in very
handy when tracing down hot leads.

Jerry

Thanks to Bob and Jerry for their posts. They were very helpful.

Jim