Abstract: A vehicle anti-theft device is disclosed. The anti-theft device provides a key operated switch that makes or breaks the electrical continuity of four electrical circuits. These electrical circuits are essential to the operation of the vehicle; therefore their discontinuity prevents vehicle operation. A lock housing carries a lock having a rotating spindle. The spindle carries a perpendicular drive pin which engages a bushing having a helix shaped groove in its interior surface. A tab-like raised key sliding in a keyway slot in the housing prevents the bushing from rotating. Therefore, rotation of the spindle creates an axial movement of the bushing. A male contact block, carrying four U-shaped solid contact pins may be extended by the axial movement of the bushing to engage a female contact block carrying eight female socket contacts which are connected to eight in-coming wires. When extended, each U-shaped pin creates electrical continuity between a pair of wires.