The model 091-160 Safety Lock 4 by Kussmaul Electronics prevents the theft of vehicles that have been parked with the engine running. The engine is often not shut down in order to drive the alternator to obtain the electrical power for lights, computers and other electrical devices. While the driver is called away from the vehicle, the vehicle is at risk for being stolen. The Safety Lock 4 permits the engine to run even when the ignition key is removed. With four separate, high power circuits, this device may be installed on most of the newer, more complex vehicles. When in use, the Safety Lock 4 will immediately stop the engine when operation by an unauthorized person is attempted.