12v key on problem

Re-read my post re: "the path." I've recommended a work-around for many guys. Electrically cut the IGN1 "run" wire coming out of the bulkhead. Use that to trigger a Bosch style relay, and feed the power terminal with a fuse/ breaker from the starter relay. Connect the engine bay end of the cut "run" wire to the switched contacts. You can add a switch in series with the trigger/ coil circuit to make a simple anti-theft feature