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.

When installing an electric fan, it's important to use an electrical relay so you don't tax your charging system too much. Most factory fans pull a lot of amps from the charging system ...

A fan center consists of a transformer with screw terminals which is solder connected to the coil of a relay, both of which are mounted together on a plate. It is not uncommon to find these on modern ...