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What is the start solenoid?

What is the start solenoid?
Update Time:2017-05-22
In a car or truck, the starter solenoid is part of an automobile starting system. The starter solenoid receives a large electric current from the car battery and a small electric current from the ignition switch. When the ignition switch is turned on, the small electric current forces the starter solenoid to close a pair of heavy contacts, thus relaying the large electric current to the starter motor.