Once the engine engages, a spring brings the pinion gear back to the starter, where it remains idle until you need to restart the engine at some point. The solenoid also sends a pinion gear forward, which is the device the starter uses to turn over the flywheel. The solenoid uses that small amount of juice to close two heavy-duty contacts that allows a large jolt of electricity to pass through the starter. When you turn the ignition key, a small amount of electricity goes to the solenoid.
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