What is the function of a starter solenoid?

The starter solenoid's primary function is to act as a switch that sends power to the starter motor when the ignition is engaged. When the driver turns the key or presses the start button, an electrical current flows to the solenoid, which then closes a circuit. This action allows a larger amount of current from the battery to flow directly to the starter motor, enabling it to turn the engine over and start the vehicle.

The solenoid is crucial for this process because it allows a smaller control signal to manage a larger load without requiring a heavy-duty switch or direct interaction with high currents by the ignition system. This design ensures safety and efficiency in starting the vehicle while protecting the ignition system from high-current draw.