I would ignore the red wire on the RCA cable. The rca goes from HU to camera, then the other plug goes from camera to ground and your reverse power wire. I forget where I ran mine too, I think I ran it into the cab and tapped the power wire for the headunit. then the reverse sensor wire goes from the hu to the wiring harness under the dash and you will be good to go. I see no reason to be powering the rca.