How to Troubleshoot Brushless Generator Armatures

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Things You'll Need

  • Voltage meter

  • Magnet


Replace any frayed wiring. The cost is minimal and the knowledge that the wiring is intact is priceless.


When measuring voltage protect yourself from electric shock by wearing rubber soled shoes and gloves.

A brushless generator's main parts include stator coils, stator plates, armatures, rotator shaft, rectifiers and an alternator. The rotor shaft connects to the alternator. Rectifiers hold the rotor shaft on to the alternator. The alternator acts as the DC power source for the main rotor. In a brushless generator the armature does not rotate. The stator coil surrounds the brushless armature producing electricity. When a generator is running correctly the voltage between the DC and AC power supply establishes equilibrium in voltage. Troubleshooting a brushless generator requires a magnet and a voltage meter.


Step 1

Find the armature in the brushless generator. The armature connects to the flywheel and the stator.

Step 2

Check if the armature spins when the engine starts. If it doesn't spin then the power supply to the armature is broken.

Step 3

Hold a magnet near the armature checking for a pull on the magnet. Check the magnetism in the armature. If there is no magnetic pull then the armature isn't producing the small voltage required for the stator to work properly. Do not check the magnetism of the armature with the generator running.


Step 4

Clamp the voltage meter onto the DC terminals; red (positive) connects to red and black (negative) connects to black. The current will read on average 10 volts. In the beginning of the electric cycle 10 volts is required for the AC current to reach the armature.

Step 5

Look at the wiring of the rotating rectifiers. If the rectifiers are not connected there is no electric supply to the armature.

Step 6

Set the voltage meter on the regulator of the generator and test the voltage. Connect the red clamp (positive) to the red terminal and the black clamp (negative) onto the black terminal of the generator to test the voltage. After a few cycles have completed a state of equilibrium occurs. This equilibrium produces the correct voltage output for the generator. If there is no equilibrium sustained then the DC and AC currents are not continuous.


references & resources

Tammy Bronson

Tammy Bronson has been a freelance writer since 1994. As a writer for Thompson Gale Publishing she wrote autobiographies and legal reviews. With Bronson wrote innovative informative articles about colleges and universities nationwide. She lives in the Greater Boston Area and has a Master of Arts degree in literature and writing from the State University of New York.