Reverse light wiring

You need to post the destructions. What does the EZ book say. It should show you at least in general. It's a switch. EZ should show a power wire for them, and that goes to the switch, and the wire leading to the rear for the lights, and that goes to the switch. Since EZ is GM / Ford all the time ALL the time, they may not provide wiring through the bulkhead for this, you'll have to add wire