problem solved for $30 at dealer
took the car to Laural Mercedes in Westmont Il..mechanic John Kostal replaced fuse #5..that was it. As they also hand wash the car there, which is about $25 where I live...I think the service was really $5.
anyway, i highly recommend Laural..they could have jacked up the bill with a charging system check, etc for a lot more $$..but they didn't . as a new merc owner, i also found out about the 24 hour road service, which I had assumed was only for original owners, but extends to all owners.