AUTO THEFT PREVENTION DEVICE

摘要

A security system for motor vehicle ignition or starting circuits wherein a lock switch unit is connected between essential circuit elements such as the primary coil and the distributor. The system has a special provision for the defeating attempts to bypass the lock switch by cutting the conductors to and from the switch and shorting the circuit between the essential circuit elements. This is accomplished by means of a cable extending between the lock switch unit and an essential circuit element and comprising a plurality (e.g., 20 or more) of discrete identical insulated conductors. A first group of these conductors is connected between the switch unit and one essential circuit element, a second group between the switch unit and another essential circuit element and a third group is grounded at one end. If the cable is cut through by a thief, he would be unable to distinguish the conductors of the three groups and would thus be frustrated in an attempt to bypass or short circuit the lock switch.