Electric Cooling Fan Relay Wiring

Next splice together both black wires from the relays tab 85 and connect them to the thermostat switch.

Electric cooling fan relay wiring.

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. It shows the components of the circuit as simplified shapes and the capability and signal contacts between the devices. And if a relay fails you will still have one fan running. It uses a 40 amp electric relay and electric fan sensor.

You could use one relay. See all 8 photos. Use a blade terminal for the relay and a barrel connector for 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.

Cut another piece of the 10 gauge wire long enough to go to the fan. The first part of the installation is to install the electric fan to your radiator and remove the mechanical fan. Then connect switched power usually from your ignition switch to the blue wires on both relays tab 86. Use a female terminal on the other end and attach it to the switch terminal of the relay.

A relay kit our part number ccfkrl will include everything you need to properly wire up your electric cooling fans with the exception of additional wiring needed to complete all of the circuits. 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. However two relays will divide the load.