A-B11001995MA-AI SWITCH - IGNITION SELOne New Aftermarket Replacement Ignition Selector Switch for Murray and Fits Craftsman Lawn Tractors This ignition selector switch (ignition sel) is the key operated electrical switch that controls engine starting and stopping on Murray and Fits Craftsman riding lawn tractors. When the key is turned, the switch sends power through its terminals to the ignition circuit to start the engine; turning it off interrupts that circuit to stop the engine. Over