2010 police tahoe. I bought a pioneer reverse camera as well as headunit. I wired everything up and it does power on and work, however the reverse signal I had in the axes harness isn't powered up, I assume because something with the police wiring omitted it. So I need to find a wire up front to tap into the reverse signal.. I really want to avoid running a wire all the way back to the tail light to tap into. Not finding anything on where the pin is for either the reverse lamp or the trailer reverse lamp.. anyone know where the pins at up front?