Starting Motor Circuit
The magnetic switch coils are magnetized when the ignition switch is closed. The resulting plunger (2) and pinion drive lever (1) movement causes the pinion to engage the engine flywheel gear and the magnetic switch (4) main contacts to close, and cranking takes place. When the engine starts, the pinion overrunning clutch (7) protects the armature from excessive speed until the switch is opened, at which time the return spring causes the pinion to disengage. See Fig 1 .