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CM rotors operate on AC, as I believe all of the name brands do.
Output voltage should be noted, on the bottom.
AC is used, so the motors don't burn up, if the rotor seizes.
DC views coils as pretty much, as a straight wire that offers very little resistance.
Unless the controller has a broken wire to one of the terminals, it IS putting out.
Otherwise, the dot would not be moving.
I would suspect corrosion, or hardened grease inside the rotor.
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