It turned out to be some worn wires on my main harness inside the frame rail. If I were you I would check where the wires go in toward the front and where they come out at the rear crossmember on the pass side. Maybe they are just scuffed up and hitting the metal of the frame. I had my entire harness pulled out from the frame. A few large sections were replaced and tapped up. I chose to waterproof it and zip tie it up to the frame rather then putting it back inside.
So far all good.
Hope this helps.