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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.