Originally Posted by the.Santorini

Swapped out the alternator and no more whining noise.

I've seen a few other posts around here about Bosch alternators and modifications needed to get them to work. The Bosch alternator to get is AL0787X. Exact fit without modification and despite it being a bit larger in size it went right in without hesitation. Ironically it even had the Mercedes star etched into it though advertised a just a Bosch alternator on Amazon.