Evaluating old Wiring Harness
You could put harness on plywood or pegboard. Unwrap and change out 1 wire at a time. Rewrap and install. Stole pic from web, but something like this.
You could put harness on plywood or pegboard. Unwrap and change out 1 wire at a time. Rewrap and install. Stole pic from web, but something like this.