this is a new one, these things are usually bullet-proof. Run a resistance check on the coil after making sure wire is not connected to frame when yo do so.... resistance should be nil; check resistance between wire and frame, again with no obvious connections between wire and frame.. this should be very high resistance or no conductivity at all... if there is low resistance you have a shorted coil; when you reassemble the thing, run an extra ground from the motor frame to the chassis... make sure to polish and clean contact spots... no grease, corrosion or paint... just shiny metal. If there is no short from the coil wire to the motor frame, the thing should still work. A dremel tool with wire brush will help clean contact areas.
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