This test requires both a fully charged battery and a generator test stand to operate the generator. The generator can be tested quicker and easier while it is still on the vehicle. Refer to Generator Not Operating Properly

1. Ensure that the carbon pile is off before making the connections as shown.

•	The ground polarity of the generator and battery must be the same.

•	The battery must be fully charged.

•	Use a 30-500 ohm resistor between the battery and the L terminal.

2. Slowly increase the generator speed and observe the voltage.
3. If the voltage is uncontrolled and increases above 16 volts, the rotor field is shorted, the regulator is not working properly, or both. A shorted rotor field coil can cause repeat regulator failure.
4. If the voltage is below 16 volts, increase speed and turn on and adjust the carbon pile to obtain maximum amperage output. Maintain the voltage above 13 volts.
5. If the output is within 15 amperes of the rated output, the generator is good. If the output is not within 15 amperes of the rated output, replace the generator.