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Starting System Principle of Operation: Solenoid: Notes

The Solenoid performs the following functions:

Pull the pinion to engage the flywheel
Hold the pinion engaged with the flywheel during starting rotation.
Complete the electrical circuit from the battery to the brushes of the starter.
Cause the pinion to retract from the flywheel.

Fig 1: Identifying Solenoid Switch Assembly Components

G04730686

Courtesy of BMW OF NORTH AMERICA, INC.

Two windings are used to pull and hold the pinion engaged to the flywheel.