Abstract: An anti-theft device for an automotive vehicle is provided. It is positioned on top of a battery for an automobile or the like which is provided with positive and negative terminals. The anti-theft device is located within a housing having upper and lower sections. The lower section has an opening for receiving the positive pole and a battery clamp.The anti-theft device receives a positive pole of the battery. The battery clamp fits over the positive pole. The anti-theft device includes a key actuated switch connected by a main power source to a new positive pole. This main power source is switch controlled.A constant power supply is connected to a resistor and by electrical connections to the key actuated switch through the positive pole of the battery. By timely use of the key actuated switch, the anti-theft device can be turned on and off to secure the automotive vehicle.