Recently my alternator gave out and I had it rebuilt. The car has been driving fine since then which was a few months ago. Today the battery light started flashing and everytime I step on the gas I hear a whining noise. The belt was also replace along with the alternator.
Was wondering if anyone had any input to what they think it is? a pully maybe?
Its a 2005 BMW X5 3.0

Heres the video of the sound.

https://www.youtube.com/watch?v=mNueSFr-TXM