Thanks for all the help. I had the battery checked at NAPA and my ohm meter. It came back within reasonable readings. Took the starter off and tested by connecting battery charger to posts on starter and it did spin, so ruled out the starter. I got frustrated and called Mercedes on Call and they just replced the battery and it fired up. Tech told me that he gets at least 2 of these calls for roadside assist a day. My first guess was the battery, but when I got a good reading, I started to look elsewhere. Thank GOD for simple solutions. was begining to think I had locked the engine.
The Benz is back....
Thanks again this is a great forum.