Electric Cooling Fan Relay Wiring

Use a blade terminal for the relay and a barrel connector for the fan.

Electric cooling fan relay wiring.

Finally run a fused constant power to both of the red wires on the relays tab 30. Then connect switched power usually from your ignition switch to the blue wires on both relays tab 86. Electric fan relay wiring diagram wiring diagram is a simplified tolerable pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes and the capability and signal contacts between the devices.

The first part of the installation is to install the electric fan to your radiator and remove the mechanical fan. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay tab 87. Next splice together both black wires from the relays tab 85 and connect them to the thermostat switch. See all 8 photos.

Primary cooling fan dual fans with dual relays single speed on off using ground switched devices only for primary activation using dual relays for two fans is not required. And if a relay fails you will still have one fan running. Cut another piece of the 10 gauge wire long enough to go to the fan. The positive wire coming from the electric fan will connect to one of two red wires on your relay while the negative wire needs to go to ground.

It uses a 40 amp electric relay and electric fan sensor. Use a female terminal on the other end and attach it to the switch terminal of the relay. You could use one relay.