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Units Without Field Relay

  1. With ignition ON and engine OFF connect voltmeter positive lead to No. 3 regulator terminal and connect voltmeter negative lead to "F" regulator terminal.
  2. If voltage is not  between 0.9 volt and 2.0 volts, regulator must be replaced.
    Fig 1: Typical Transistor Regulator Internal Circuits (Without Indicator Light Or Field Relay)
    G09333240Courtesy of GENERAL MOTORS COMPANY
  3. If voltage is between 0.9 volt and 2.0 volts, operate engine for 15 minutes at 1500 RPM with headlights ON. Measure temperature of air VV from regulator cover (ambient temperature). Connect voltmeter between ground and No. 3 regulator terminal. Check voltage against specifications given in table.
  4. If voltage is not  within specified range, regulator must be replaced.
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