The ignition switch in a car has numerous purposes. It allows a person to control the power of the many accessories of a car, preventing these accessories from draining the battery of a car when a car is parked. The switch is a switch that activated the main electrical systems of a vehicle provides power to the starter solenoid and the ignition system components. The ignition switch also has the primary function of connecting the starter to the battery. This allows the battery to send a powerful surge of energy to the starter when the car, thus allowing the car to be started. Switch and Key Will be tested to ensure proper function Steering column or column switches The ignition switch, used to start or turn off the vehicle. Normally activated by the ignition keys. It may also have an "Accessory" setting for operating many of the vehicle's features (such as the radio) without turning the vehicle on.