Wiring Diagram. Terminal 86 = 12V trigger. Terminal 85 = Ground trigger. ... Once you activate the relay with 12V power and ground, the relay will power the accessory.

If you are unsure which wire is which coming out of the electric fan, find the fan manufacturer's supplied wiring diagram. ... The Right Way to Hook Up a Relay to 12 Volt Power.

It has 2 terminals and 4 connectors and you can look at the DPDT relay as the equivalent of 2 Single Pole Double Throw SPDT relays. DPDT relay applications 1. Change motor direction with DPDT relay.