Good vom 20K ohms per volt sensitivity. Put on highest range. Meter from each copper bar to armature shaft. Have not seen a short in this area myself ever.. What are symptoms. If short in this area I would think commutator bars would be very burned. Not just light purple. And brushes burned, too. More common might be open commutator. Look for loose bars and solder joints burned off. Check continuity from each bar to adjacent bar. Used to use 110 volt and 50watt light buld. Could use for short testing too. BE CAREFUL this little setup can fry you. Maybe stick to VOM. That was 50 years ago.
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