How to Wire a Relay for Off-Road LED Lights – Extreme Lights What Is A Relay?Do I Need A Relay?How to Wire Your Light Using A RelayA relay is an electrical switch. It allows a low current “switch” circuit to control the electricity flow of a high-current circuit.See more on extremelights 12 Volt Relay Wiring Diagram | Free Wiring Diagram Assortment of 12 volt relay wiring diagram. A wiring diagram is a simplified traditional pictorial depiction of an electrical circuit. It reveals the components of the circuit as simplified shapes, and also the power and signal connections in between the tools. How To Wire A Relay A wall switch relies on someone to flip it which will then control a light or some other type load. A relay is switched by electrical power and not a human. This is done by energizing a coil which is internal to the relay and by energizing the coil, the relay changes state just like a wall switch would. Wiring Diagrams - how-to-wire-it This page is dedicated to Wiring Diagrams that can hopefully get you through a difficult wiring task or just to learn some basics in how to wire a 2-way switch, 3-way switch, 4-way switch, outlet or entertainment component diagrams you don't see a wiring diagram you are looking for on this page, then check out my Sitemap page for more information you may find helpful.