You don’t have to be a wiring guru to understand the principle of an electrical relay.
Quite simply, relays are essentially switches that can be remote-controlled.
They work by using the principles of electro-magnetism.
When energized by a simple 12-volt source, the magnet will either turn the electrical switch on or off.
Want more information about how relays work? Read this, Relay Case: How to Use Relays and Why You Need Them
Wiring a relays is pretty basic, but can be confusing to folks without a ton of electrical experience.
The folks over at Dorman made this quick, one-minute video that walks you through a typical automotive relay’s wiring procedure.
It’s a quick watch, and very useful in understanding what you’ll be working with when installing a relay.