An easy way to check your feilds is to unhook them from the controller and then use machine room 110vac to power them up. Then take voltage reading across each feild. If you have a 4 pole motor you should read about a 30 volt drop across each feild. A six pole motor about 20vac drop. On gearless jobs you will be able to test at the lugs. On smaller motors we will use large neddles and poke the thru the wires. If you have a shorted feild it will read a much lower voltage drop.
