The answer to 'why is my generator buzzing noise' is that a buzzing or humming noise from your generator is often caused by a problem with the alternator or voltage regulator. This can be due to a loose connection, worn bearings, or a malfunctioning voltage regulator. The buzzing noise may also be a sign of an electrical issue, such as a short circuit or a problem with the generator's windings.
If the buzzing noise is accompanied by a loss of power or the generator is not producing the expected voltage, it's important to address the issue promptly. Continuing to run the generator with a buzzing noise can lead to further damage and potentially dangerous situations.