Let the wires that run from the capacitor to the motor.
How to test a attic fan motor.
A reading of zero means the fan motor winding is likely shorted and causing the breaker to trip or blow.
Switch the analog volt meter from ohms to volts.
Once done test that the motor still works by.
Step 1 test the fan motor.
How to test an attic fan motor.
Step 2 test the thermostat.
Step 3 test the connection between the thermostat and the power source.
Turn the attic fan off and unplug the motor from the thermostat.
As you probably know fan motors can be designed for several different purposes most common of these are single phase motors.
Disconnect the wires that supply power to the motor with appropriate screwdrivers.
How to test fan motor starting capacitors.
An infinite reading on the other hand may indicate an open motor winding.
If either of these conditions exists the fan motor needs to be replaced.
Create a parallel circuit by placing the leads on.