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Carbon Pile Load Generator Test

NOTE: Ensure battery is fully charged when performing this test.
  1. Ensure fusible link between starter and generator is okay. Ensure connections are clean and tight.
    NOTE: Blown fusible link may be caused by an internal generator failure. Verify no external arcing or shorting of fusible link with other wires and/or components is present. If no problems are found, replace generator.
  2. Install carbon pile load tester and voltmeter across battery terminals, and connect clamp-on ammeter to one of the battery cables. Start engine and raise engine speed to 2000 RPM.
  3. With engine at 2000 RPM, observe voltmeter. If voltage is uncontrolled or is greater than 16 volts, generator is bad. Replace generator. If voltage is less than 16 volts, turn carbon pile load tester on.
  4. While maintaining engine speed at 2000 RPM, adjust carbon pile tester to obtain a maximum current reading on ammeter. DO NOT allow voltage to fall to less than 13 volts. If generator output current is within 15 amps of rated output, generator is good.
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