I'd personally Verify battery voltage, if also small the motor will not likely crank. Maybe you have a parasitic draw draining the battery. - Nick at Pelican Pieces picador good day I am getting the same issue with my 2011 w204 [c300 sport 4matic] I adjusted the battery yesterday and https://spencerdvdie.blogstival.com/50665701/mercedes-ignition-switch-options