21 replies to this topic

[Dan Webster]

white is common on that motor black is high and red is low if you have nothing between black and white or red and white then you have a bad motor.

[Northern-Tech]

  You mentioned that you had an open ground. Not the ideal situation. If the motor was grounded, it should trip the breaker / blow the fuse, but with no ground wire to do this, it wont happen. Check for ground by isolating the incoming power leads, ( shut off breaker first pls ), and checking each wire  to ground by using multi -  meter, set to ohms ( put one  lead on the casing of the motor, making sure you have good contact with the frame ) . Ideally reading should be infinity, or it may say O/L ( overload ) on the meter. (  Normally you would use a " megger " to test the winding, and put a higher voltage on than the motor normally runs. However, since Im assuming you dont have one, you can use a meter ). This only puts in the 9v battery power, but it may show up. If its grounded, its shot.

Note: the windings may be good, but if you have an ohm reading to the case of the motor, the motor is toast.              Pls get that ground wire fixed.

(In canada, if the wire does not have a ground wire, (older wiring ) you can install a Ground Fault receptacle, as an option. Might be the same in US. )