chirping alternator

I recently replaced the 2 idler pulleys and belt simply due to age. This noise has come up since then. I have tried to get the tensioner to make noise an d cannot get it to make a peep. It is still strong and smooth to move. I even took it off and sprayed the inside of the tensioner works with Kwiklube. Reinstalled it with no difference.

I guess I will just have to bite the bullet and change the alternator. Will probably give up on it for now and deal with it early next year.

Thanks for all the suggestions. -- Mick