Abstract: An anti-theft device for motorized vehicles consisting of three relays and a number of switches controlled by the relays that are wired into the existing electrical system of the vehicle. The first relay energizes in response to an electrical signal generated by the existing electrical system and controls the sequencing of the disarming steps. The second relay disarms the device when energized by a signal generated in the existing electrical system but only after the first relay has been energized. The third relay activates the alarm and/or disables the vehicle starter when energized. The third relay will energize when there is an attempt to start a vehicle without following the prescribed sequence of disarming steps and is prevented from sounding an alarm and/or disabling the vehicle starter by the second relay when the second relay is energized. A connector consisting of a male-female pair that is installed with the pair disconnected.