Okay, if you found that pulling the harness caused issues, make the areas you move smaller. Take the harness between two hands about 3inches apart and tug on it, any change? Yes look at the wires in that area for hourglass marks in the insulation, it's possible for a pinhole to let in moisture and air over time and corrode the wire apart inside the insulation. No change, move farther down the harness. When you find the area you can remove any wire loom or tape around the harness and test each wire by giving it a good tug, a good wire will be fine, one that is corrode will pull apart and break, then you have the area to repair.
I would also check any connectors or connections that move when you move the harness. Chryslers are bad for poor grounds and corrosion in connectors. Reason I say this is that you know that most of your harness is okay, installing a used one could repair the issue but if it was one of the connections to the harness the problem would still be there.
Wednesday, August 25th, 2021 AT 7:59 PM