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Charging Indicator

  1. If light is on with ignition "OFF", check for shorted positive diode. If light is not on with ignition "ON" and engine not running, check for burned out bulb, open in light circuit or open in field.
  2. If light is on with engine running above idle speed, check for no alternator output, shorted negative diode or loose or broken alternator belt.
    Fig 1: General Motors "S" Models Instrument Cluster
    G09337570Courtesy of GENERAL MOTORS COMPANY