Automotive fan circuit for High and Low speed fans. Adjust the potentiometer to control the fans.
The Potentiometer acts as the Thermistor to send voltage to the relays.
The relays are calibrated to activate and deactivate at a specific voltage(Temp)
Typically the vehicles ECU, PCM, etc. would be programed to send power to standard relays at a given Temperature.
I will upload a dual fan setup that could be used for aftermarket applications, that doesn't require calibrated relays.
