Assuming you don't mind the reverse lights coming on along with the backup lights when using the aux switch. I don't see an issue since I am using aux 4 for additional light when I am messing around behind the truck.
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Tomorrow I will move some wiring around and connect aux 4. If the stock reverse lights come on too, so be it. Hopefully they wont.
dataustin- can you tell me exactly how you ran your wiring from the passenger footwell to the rear bumper?
Kinda. So you connected the rear lights to the wires in the engine bay that connect to the footwell wires?