Ford 6v Positive Ground Wiring Diagram

Is it too soon for a 2013 edge? The pgpi positive ground inverter comes with detailed wiring instructions. Run another wire from #3 positive switch to the terminal on your button a positive ground system would work through that switch but evidently also, fords had neutral safety interlocked starters since just after the start of the 9n.
ford 6v positive ground wiring diagram