Replacement wiring harness

Rebuilding your harness isn't rocket surgery.

Pull the harness out and lay it on a piece of plywood. Separate it all out and outline it with finishing nails. Unwrap and start replacing/repairing one wire at a time. If you spend a little time figuring it out, you can add additional circuits that you'll need.

Here's a wiring harness I was working on for a 53 Chrysler Windsor.

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BTW, this is the method used to build short run production harnesses. I've seen this used for military electronics.