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2,293 Posts
Blue Angel,
Silicone Sam and Ansimp are right on the money.
As you can see with my hand drawn thingy that there is always power going to the fan and until the fan gets turned on there will be power coming out of the fan too. When the sensor reaches its temperature limits and activates, it conducts to chassis ground via its own threads. That’s why you only see one wire going to this type of sensor.
The easiest way to hook up something is to take the power off the leads on the connector going TO the fan. This is what I did. I hooked up an amber LED pilot light to my circuit. Mine was not polarity sensitive. Some are and will be marked which lead is +. LED pilot lights are much easier to use and see than going with a discreet resistor and small LED. No fuss no muss.
I like the LED pilot light and it works well.
Tim.
Silicone Sam and Ansimp are right on the money.
As you can see with my hand drawn thingy that there is always power going to the fan and until the fan gets turned on there will be power coming out of the fan too. When the sensor reaches its temperature limits and activates, it conducts to chassis ground via its own threads. That’s why you only see one wire going to this type of sensor.
The easiest way to hook up something is to take the power off the leads on the connector going TO the fan. This is what I did. I hooked up an amber LED pilot light to my circuit. Mine was not polarity sensitive. Some are and will be marked which lead is +. LED pilot lights are much easier to use and see than going with a discreet resistor and small LED. No fuss no muss.
I like the LED pilot light and it works well.
Tim.
