I bought a 3 in one back camera (two ultrasonic sensors and one camera in center), as in pic. In order to avoid 13 mm hole I cut the wires. there were 4 wires black, white, green and yellow. I reconnected all the wires but camera stopped functioning. Why it happened that by reconnecting wires the camera is not functioning. My second question is ho can I use back up rear view camera as front view camera?? )