A circuit that will effectively protect your car from theft. It can be triggered from the vibrations that will inevitably cause anyone attempting to break into the car. It will also detect a door opening as long as it is connected with the courtesy light by sensing the voltage drop across the car battery when the light is turned on. It can operate from 6 or 12 VDC. It has entry and exit delays and the alarm duration is adjustable. It resets automatically after an alarm. Suitable box: 2019.