How To Test Ac Fan Motor With Multimeter. If your fan motor is a 120V it will most likely have four colored wires black blue red yellow etc as well as a white wire a black wire and two brown wires. Test both the white and the white-brown wires.
If you want to do a quick test of the blower resistor you can check the resistance of each of the resistors with a multimeter as follows. Check the connection bar for terminal U V and W. Using the red multimeter probe touch the white-brown wire continuously.
Check the motor winding resistance or ohms reading with a multimeter.
Set your multimeter to Ohms. Keep the multi-meter set for 30000-ohms and touch one test lead to one terminal and the other to another terminal. You should test the windings for a short to ground in the circuit and open or shorts in the windings. Check the connection bar for terminal U V and W.
