Starters - DELCO-REMY: Operation

In the basic starting circuit, the solenoid windings are energized when the switch is closed. This causes the plunger and shift lever to move the drive pinion into the flywheel ring gear. The solenoid main contact closes, causing cranking to occur. When the engine starts, pinion overrun prevents armature damage due to excessive speed until the switch is opened. This permits the return spring to disengage the pinion from the flywheel.