As the key is turned, the starter solenoid then closes two contacts or metal points together. In doing so, the solenoid relays electrical currents from the ignition to the starter motor. That begins a ...

Essentially, a solenoid is a compact electromagnet that can be used as a mechanical or electrical ... like starter solenoids also use the plunger to open or close a circuit, acting as a relay ...

The starter motor can draw several hundred amps of electrical current during this operation, and it relies on the integrity of the solenoid contacts ... underhood starter relay, faulty ...

Several years ago, Paul Rako, in collaboration with the late, great Bob Pease, wrote a terrific article about the finer theoretical and practical points of electromagnetic solenoid-driver circuits.