So take a piece of plywood and lay out the original harness - with everything labeled. Some guys posted pictures in the FABO thread called "Wiring Nightmare"
Then lay your new harness out next to it. Use the new as the base and make it match the original., Copy and Add/transfer wires as needed.
Great idea! I was thinking of returning this harness or maybe even selling it, then ordering the mopar specific one I found last night for only 60 bucks more than I paid for this one.