WIRING NIGHTMARE

I used to build harnesses from a schematic one of one thing for a motor controller company.
There is a couple ways to do it, build a new right next to the old one in the car then remove the old one.
Or take the harness out of the car and nail it to a piece of plywood, cut off the wrapping then replace the wires one by one. Something like this.

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got it that makes it easey