<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> A starter solenoid (or starter relay) is the part of an automobile which switches a large electric current to the starter motor, in response to a small control current, and which in turn sets the engine in motion . Its function is thus identical to that of a transistor, but using an electromagnetic solenoid rather than semiconductor to perform the switching . In many vehicles the solenoid also engages the starter pinion with the ring gear of the engine . </P> <P> An idle starter solenoid can receive a large electric current from the car battery and a small electric current from the ignition switch . When the ignition switch is turned on, a small electric current is sent through the starter solenoid . This causes the starter solenoid to close a pair of heavy contacts, thus relaying a large electric current through the starter motor, which in turn sets the engine in motion . </P>

What is the difference between a starter relay and a starter solenoid
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