[Shane826]

Bill- Disconnect one of the wires to each tail light at the refrigerator. Attach new tail light wires and a reverse light wire to each disconnected wire. SLOWLY pull the wires from the tail light end, which will then pull the new wires with it. Viola, you now have back up wires.

This may be even easier to do in two sections; one through the rear shell and one down the lift arm to the refrigerator cavity.