What is a main relay?

A main relay is an electrical component in a vehicle's ignition system that controls the power supply to various electrical systems. It acts as a switch, allowing or interrupting current flow from the battery to the ignition switch and other essential components when the ignition is turned on. This relay helps ensure that electrical systems operate efficiently and can prevent damage from potential overloads. In addition, it plays a crucial role in improving the vehicle's overall reliability and performance.