Bench Check - Generator

Generator Bench Check:

TOOL REQUIRED:
J 39200 Digital Multimeter
The following bench check may be used to simulate operation on a vehicle. Use the bench check to verify operation of a generator that has been repaired.
1. Mount generator in suitable test stand according to test stand manufacturer's instructions. Test stand must be capable of driving generator assembly at 6,500 RPM.
2. Make electrical connections. Be sure the carbon pile is turned off. Ground polarity of generator and battery must be the same. Battery must be fully charged. Use a 50 ohm resistor between battery and "L" terminal of generator.
3. Slowly increase generator speed and observe voltage using the J 39200.

Important: The battery must be fully charged when performing this test.

4. If the voltage is uncontrolled, and increases above 16 volts, repair or replace the generator.
5. If the voltage is below 16 volts, increase speed and connect and adjust carbon pile to obtain maximum amperage output. Maintain voltage above 13 volts.
6. Use an ammeter to check amperage. If output is within 15 amperes of the rated output, generator is good.
7. If output is not within 15 amperes of rated output, repair or replace the generator.