What is the purpose of a relay on a wiring harness?

Employing a relay system serves multiple purposes in your electrical circuit. Firstly, it keeps the high current portion of the circuit away from the switch, ensuring the switch doesn't have to handle heavy loads, thereby prolonging its lifespan. Secondly, the relay efficiently pulls the current directly from the battery to power your KC lights, ensuring a stable power supply for optimal performance.

Additionally, the relay offers the flexibility to tie your lights into a secondary 12-volt circuit, such as your high/low beams or ignition. This integration allows for seamless control and synchronization of your lights with other vehicle functions, enhancing convenience and functionality. By using a relay, you not only optimize the performance of your lights but also enhance the overall efficiency and safety of your electrical system.