Starting System: Description and Operation

The starting motor has field coils mounted in the starting motor (yoke) frame. The magnetic switch assembly and the parts in the starting motor are enclosed in housings so that they will be protected from dirt and water. In the circuit, the magnetic (motor) switch coils are magnetized when the ignition switch is closed. The resulting plunger and pinion clutch movement causes the pinion to engage the flywheel gear and the magnetic switch main contacts to close, allowing cranking to take place. When the engine starts, the pinion overrunning clutch protects the armature from excessive speed until the switch is opened, at which time the pinion will disengage.