Grinding noise from alternator area?

[blue thunder]

Never had this noise before. I think it is coming from alternator but not 100% sure. A grinding noise that comes on and off every few seconds. Not a squealing noise. I have a new belt and I adjusted the tension a few times but the noise persists. Has anyone had the bearings go bad in the alternator? Someone said that could be the issue. I may take it to the store to have it tested if it makes the noise there. Any ideas what this noise is would be appreciated.

Mike