The spark method of armature testing won't detect a shorted armature winding. Only if it is shorted to the frame (second test). If the armature coil windings themselves are shorted to each other (insulation failure) the only true way to test is a growler. You will get better results testing your armature segments (between commutator bars) if you use an ohmeter set to a low scale. Again this is not a definitive test but rather shows continuity. The growler requires the armature to be separate from the motor.
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