When the switch reaches a predetermined temperature, it closes the circuit to the relay. This energizes the relay sending 12 volts to the fan. When the temperature decreases below the set point of the sensor, the circuit opens and the voltage is no longer applied to the fan.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Disconnect the sensor electrical lead and unscrew the sensor.
- Install the sensor or relay and connect the electrical lead.
- Connect the battery cable.