Please check below wires for setup:1. check is there two red trigger wire on the camera extension wire. 2. If you find it, connect one of the trigger wire to the reverse bulb wire together with the camera power wire.3. Connect the other red trigger wire to the pink wire labled "back car" on our unit. 4. The RCA socket need to plug into the "CAM" hole on the back of our unit chassis. 5. When you reverse the car, the reverse bulb wire give power/signal to both camera and our unit.