Diagnosis By Symptom

Noise from a generator may be due to electrical or mechanical causes. To determine if an objectionable noise is caused electrically, carefully unplug the four terminal connector with the engine running. If the noise stops, it is caused by the electrical operation of the generator. Electrical noise level may vary with current demands, and is a normal operating characteristic. The electrical noise level may vary slightly from generator to generator, but replacing the generator may not reduce the overall noise level.

If the noise does not stop when the four terminal connector is removed, it is caused by something else and may or may not be due to the generator itself. Assure that the drive belt is in good condition and that the mounting bolts are properly tightened. Check the generator pulley to see that it is tight on the generator shaft. Assure that electrical connections to the generator are not pulling the generator into a bind, and that no hoses or other engine objects interfere with the generator components that could cause driver or passenger noise. If all other possible causes have been eliminated and the generator is still thought to be the source of the noise, try removing the generator belt and loosen all generator mounting bolts. Tighten all mounting bolts to the proper "Specifications," refer to "Fastener Tightening Specifications". If the noise still persists, repair or replace the generator.