Reverse Light Wire

[Griz 44]

Looking to hookup backup camera in my buddys 2002 7.3 F350 Dually....

Where can I find the reverse light wire near the dash?

Thanks

[ffdono14]

Cant you just tap into the wire all the way in the back near the tailgate? Why do all the extra wiring? Unless using the switch, which is what i did, i think tapping it would be easier.