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The rotor from your core alternator has to be good for the alternator to work. Here a multi-meter is used to test the continuity of the windings of wire that wrap around the rotor. Touch the test leads as shown to the two points on the rotor and you should have a complete circuit. These two points are where the brushes make contact with the rotor, so they may need to be cleaned up with a piece of fine sandpaper.