5R110 to ZF6 wiring? | Ford Power Stroke Nation Mar 16, 2013this wire away from the PCM connector. Splice onto the side of the wire that is in the harness. Send this wire and another wire down to the reverse switch on your manual trans. Ground the other wire somewhere on the fender, up by your battery so it will stay clean. Electric shift - Find the connector on the PCM closest to the front of the truck again.