A-B1695630-AI WIRE-STOPOne New Aftermarket Replacement Wire Stop Fits Briggs & Fits Stratton Engines This aftermarket replacement Wire Stop (also called a stop wire or kill switch wire) connects the stop button or kill switch to the engine block, providing the ground path that shuts down the ignition when the operator releases the bail or presses the stop switch. It is a key safety and ignition component used on Fits Briggs & Fits Stratton (B&S) small engines found in lawn