Simply replacing the generator and battery on principle is not the answer. You need to have the generator load tested, THEN replace it if it proves to have a bad diode, and replace the battery to prevent failure of the replacement generator.
In the unlikely event the noise is still there with the new generator or if it tests okay with low ripple, unplug the small connector on the side while the engine is running. If the noise is still there, it's not related to the generator. Look at the ignition system instead.
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Tuesday, June 5th, 2012 AT 3:17 AM