Christian picked up a Painless Performance electric fan relay kit with a thermostatic ... find the fan manufacturer's supplied wiring diagram. If you're still not sure, once you've completed ...

87 is the high-current output of the relay to whatever you want to turn on (e.g., an electric fan). 86 is the low-current voltage from a switch that turns on the device. 85 is the low-current ground.

A relay is used to activate a high-amp accessory with a low-amp switch. An accessory like an electric fan or electric fuel pump requires significant amperage. Sending that amperage through a ...

Revving the engine to increase fan speed in an attempt to cool the engine just makes more heat. What's needed to complement the radiator is a powerful electric ... with a relay and detailed ...