A starter solenoid is an electromagnetic switch that engages the starter motor’s gear with the engine’s flywheel. When the ignition key is turned to the “start” position, the solenoid receives power from the battery and completes the electrical circuit to the starter motor. This causes the starter motor to engage the flywheel and turn the engine over.
A faulty starter solenoid can prevent the engine from starting. Symptoms of a bad starter solenoid include: