What do I need for a proper under-dash rewire?

Its the old adage; how do you eat an elephant, one bite at a time. Same thing goes for the wiring harness, one fix/wire at at a time.

When I went through mine, i removed all the harness tape and used little zip ties to maintain the original configuration. I inspected every wire and connector. If the wire was still flexible, not heat damaged, I kept and/or repaired. All splices were done with solder and heat shrink tape.

One thing I also did was I found a wiring diagram. Enlarged it and put it on a piece of cardboard so I could easily reference the diagram while working on the harness.

You can do it, It really is not that hard. One wire at a time.

Rod

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