How to wire a relay

Relays are high-current switches that are controlled by a small switch or trigger. Relays allow you to use a low current device like a switch or computer to switch large currents like that of a headlight, pump, blower motors or heater.  In this article we show you how to wire a normally open 5-pin relay to control virtually any accessory.

Pin configuration:

• Pin 86 - Coil
• Pin 85 - Coil
• Pin 30 - Common Pin
• Pin 87a - Normally closed pin
• Pin 87 - Normally open pin