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Alternator Performance Testing

  1. If battery is overcharged go to BENCH TESTING . If battery is undercharged, check alternator wiring harness connections and drive belt tension. Ensure battery is fully charged. Connect a voltmeter to alternator "B" terminal and ground. Connect ammeter positive lead to alternator "B" terminal. Connect ammeter negative lead to positive side of battery and start engine.
  2. With all accessories off, increase engine speed from idle to 2000 RPM and read meters. Voltmeter reading should be 14.2-14.8 volts at 77°F (25°C). Voltage reading will vary depending on regulator case temperature. Ammeter should read about 10 amps. Turn engine off.
  3. If voltage is higher than standard value, replace IC regulator.
  4. If voltage is lower than standard value, ground "F" terminal and start engine. If voltage at "B" terminal is greater than standard value, replace IC regulator. If voltage is less than standard value, go to BENCH TESTING .
  5. Load test with engine running at 2000 RPM and headlights and heater blower motor on. If current is less than 20 amps, go to BENCH TESTING .
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