Have weatherking furnace, Pilot lites

I am thinking the fan is bad if you can disconnect the fan motor leads and ohm them out. White is common Red is low speed Black is high speed. You might have other colors like blue which would be med speed and maybe orange witch would be med low. There is a small run capacitor on the fan so replace both fan and capacitor at same time. After you ohm out the motor of course. You should have resistance on all leads. Use white as the main one and check each speed. Replacing the motor isn't too tuff little hard getting it out of squirrel cage