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The Scion xA Starter converts battery power into the mechanical movement that cranks the engine and begins combustion. This electric Starter consists of an externally mounted solenoid connected to the battery by heavy gauge wire. The ignition switch is set to START, which causes the solenoid to complete a circuit with a relay and a safety switch so that the vehicle is not in gear prior to the Starter turning. A rotating armature has current flowing through field coils or permanent magnets around it, and the armature and the Starter drive on the shaft are run by electromagnetic force. The drive gear interlocks with the flywheel or flexplate ring gear, rotating the crankshaft of the Scion xA until the engine fires. Then an overrunning clutch releases the drive to save the system. Other designs use an arrangement of reduction gears between the armature and drive that provides additional torque, as is applied in the single Starter style outlined in the Scion xA. All in all, this small unit incorporates electrical, mechanical and protective components to ensure that every Scion xA starts the engine under normal circumstances.