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Ok, found problem. The yellow wire is a bias wire that shades the stator field to force the motor to run the right direction. It's blown open.
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Bench tested motor 8534942, put 115 volts to red and blue wires, motor ran consistently backwards.
There are 4 wires, one for ground, red and blue for power and a yellow wire. Have no idea what the yellow wire is for. Tried shorting it to either the red or blue wires, made no difference.
Hope someone has seen this before.
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