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Armature & Field Grounded Circuit Test

NOTE: This test will determine if field winding insulation has failed, permitting a conductor to contact frame or armature core.
  1. Using a voltmeter, connect negative voltmeter lead to negative battery terminal and positive lead to commutator. Connect jumper wire between positive battery terminal and armature core. If any voltage is indicated, windings are grounded and armature should be replaced.
  2. Connect jumper wire between negative battery terminal and starter frame. Connect negative voltmeter lead to positive battery terminal and positive lead to field coil eyelet terminal. If any voltage is indicated, field windings are grounded and should be replaced.
Fig 1: Exploded View of Motorcraft Permanent Magnet Starter Motor Assembly
G90C08158Courtesy of FORD MOTOR CO.
Fig 2: Exploded View of Motorcraft Positive Engagement Starter Motor Assembly
G106403Courtesy of FORD MOTOR CO.
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