I'm going to attempt to hard wire my Garmin backup camera to my 2014 A122BH, and it would be great if I could easily tap into the wires running to the back.
Here's a photo of the wires just under the bumper that I assume lead up to my rear lights:
Ideally I'd have it on constant 12V, so I could see behind me, but if none of those are constant, I'd at least like it on a line that's on when the headlights are on.
According to this diagram from eTrailer, red might be the one:
Trailer Wiring Diagrams | etrailer.com
Thanks!