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Field Coil Current Draw

  1. Connect a jumper wire between one field terminal of alternator and negative terminal of a fully-charged battery. Connect ammeter positive lead to the other field terminal of alternator. Connect ammeter negative lead to battery positive terminal.
  2. Connect a jumper wire from negative terminal of battery to alternator end shield. See Fig 1. Slowly rotate alternator by hand. Observe ammeter reading. Field coil draw should be 2.5-5.0 amps at 12 volts.
  3. A low coil draw is an indication of high resistance in field coil (brushes, slip rings or rotor coil). A high coil draw indicates possible shorted rotor coil or grounded rotor. No reading indicates an open rotor or defective brushes.
Fig 1: Connections for Field Coil Current Draw Test
G10019Courtesy of CHRYSLER MOTORS.
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