Why is there a noise coming from my alternator?
Why is there a noise coming from my alternator? Noise from the alternator could be caused by a faulty rotor shaft, rectifiers, bearings, slip rings, stator winding or brushes. You will need to carefully inspect each of these components and replace them. One sure way of confirming that the noise is coming specifically from the alternator is to use a vacuum hose. What kind of alternator does a GM 3.8L have? This article covers the majority of 3.8L Buick, Chevy, Olds, and Pontiac equipped cars and mini-vans. To see if this alternator test article covers your specific 3.8L GM vehicle...