Item Type: Radiator Cooling Fan Relay KitMaterial: PlasticApplication: Works for 7/8 inch Fans, 10/12/14/16/inch FansHow to wire Single Terminal Fan Thermostat Switches:1.These switches should be used in conjunction with a relay.2.The switch should operate the relay and the relay should provide power to the fan since an electric fan typically draws a lot of current. When the switch closes to ground (within 170-210°C) the relay is energized and powers the fan. And the switch will open and break the ground circuit when the temperature drop.3.The relay de-energizes and cuts power to the fan.Installation Precautions:(1) Turn off the engine, and after the water in the engine radiator has cooled to room temperature, replace with a new cooling fan temperature switch.(2) Please avoid using external high temperature sources after installation.(3) When installing, avoid sprinkling water on the surrounding automobile parts.Direct Connect:(Fan will Opera when the ignition is "on")1.Attach the positive fan motor wire (Blue)to a 12V positive ignition controlled sourcee.g. fuse box.Note:We recommend the use of a 20 Amp inline fuse(not included) for each fan.2.Attach the negative fan motor wire(Black) to a suitable ground.Note:Connect directly to battery negative terminal if possible3.Reconnect the batteryRelay:Black Wire: ThermostatBlue Wire:Fan (Blue Wire On Fan)White Wire: AUX Side On Circuit BreakerRed Wire: Ignition Switch W/30A-40A BUSS FUSE