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Generator Functional Check

  1. Ensure battery is in good condition and fully charged. Check connections at battery and generator. Repair as necessary. Turn off all electrical loads. Connect voltmeter to generator output. Run engine at 2500 RPM for 30 seconds. Check voltage output.
  2. With engine at normal operating temperature, voltage should be 13-15 volts. With cold engine, voltage should be 14-16 volts. If voltage is not as specified, replace generator. If voltage is as specified, connect inductive ammeter to battery charging cable. Connect carbon pile (VAT 40) across battery.
  3. Run engine at 2500 RPM. Adjust carbon pile to obtain maximum output from generator. If value is within 15 amps of rated output, generator is okay. If value is not within 15 amps of rated output, replace generator. Run engine at idle. Adjust carbon pile to obtain maximum output from generator. If value is about 45 amps, generator is okay. If value is not about 45 amps, replace generator.
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