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Generator Output Test

  1. Ensure generator belt tension is correct and battery voltage is above 12.4 volts. Start engine and check if generator warning light goes out. If generator warning light goes out, go to step 3). If generator warning light does not go out, go to next step.
  2. Turn ignition switch to ON position. Using voltmeter, backprobe generator terminals. Check voltage at all 3 generator terminals. Voltage at "B" and "S" terminals should be 12 volts. Voltage at "L" terminal should be 1 volt. Start engine and recheck voltage at all 3 generator terminals. Go to next step.
  3. Voltage at all 3 terminals should be 14.1-14.7 volts. If voltage is as specified, check wiring between battery and generator "B" terminal. If voltage is not as specified, check wiring to all generator and connector terminals. If wiring and terminals are okay, replace generator.
  4. Disconnect connector from generator "B" terminal. Turn on all accessories and depress brake pedal. Using an ammeter, measure amperage between generator "B" terminal and connector. If amperage is 65 amps or more at 2500-3000 RPM, charging system is okay. If amperage is not 65 amps or more at 2500-3000 RPM, go to next step.
  5. Check drive belt tension. See BELT DEFLECTION  under ADJUSTMENTS. If belt tension is okay, replace generator.
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