Before I spend a few hours poking wires and checking voltage, does anyone actually know the color of the wire for the backup lights.

I'm installing the apline nav in the bracket used by the bose amp
and want to tap into the reverse lights there.

Or, better yet, is there a connection at the HU I can make?

 

Hmm, I found the wire at the driver's footwell. There, it's light green. I think that it's the same continuous wire to the back right light, then possibly to again to the left one.

At least it's a start, light green.