MagnumR01

I need a wiring diagram or help knowing about a no start no air heater on 01 Renegade sedona on the Magnum R series chassis. Cat 3126 B with Allison. No power to chassis fuse and relay. But when I get the ignition wire going into it jumped to power auto tranny control comes on to N. The air heater comes on and she will run. I just don't know where this 14ga ignition wire comes from that goes into the chassis fuses by the battery bank. I assume it's shorted somewhere upstream.

I have a no start. No power to my chassis fuse and relay panel. The 14 gauge ignition wire going into is the culprit. I give it power by jumping wire and when I put the key in and turn it air heater comes on and she will start. So where does this wire come from since it powers ecm and tranny.