Re: Backup Cam - tie into backup light?
When installing a wired camera system, the camera gets its power from the positive lead on the reverse light. This then powers the camera and then the monitor comes on. It should be pretty similar for a wireless system.
One thing to consider doing is powering the camera independent of the reverse light and instead use a 12v switch to turn it on and off. I did this in my Yukon so I could see what was happening back there whenever I wanted to.
2013 GC TrailHawk V8
It's the TV for a 24' Ultralight travel trailer