What does the ignition switch control in a motor vehicle?

The ignition switch is a critical component in a motor vehicle's electrical system, primarily functioning to control the power supplied to various onboard systems, including the chassis. When you turn the ignition switch, it connects the battery to the ignition system and also powers the vehicle's accessories, such as the dashboard lights, radio, and other electronic components.

By managing this power distribution, the ignition switch ensures that the essential systems are operational when starting the vehicle and that they can be turned off when necessary to conserve battery power when the vehicle is not in use.

Understanding this function underscores the importance of the ignition switch in the proper operation of a vehicle, particularly in terms of safety and vehicle readiness.