I have a Trande XL 90 furnace and the blower stopped turning. When I take the blower out of the furnace and leave it on the floor, it works fine but as soon as I install it in the furnace it stops, buzzes and heats up. If I ground the blower to furnace after removing it from it, it stops and buzzes. Think one of the windings in the motor got grounded. Any thoughts?