I replaced the battery in my 2007 Mercedes-Benz SL 55 and now the red battery light on the dash stays on.
Have alternator tested should be charging at 14 volts.
Also check alternator fuse.
Looking for a Used SL-Class in your area?
CarGurus has 2,982 nationwide SL-Class listings starting at $2,900.
Search Mercedes-Benz SL-Class Questions
Mercedes-Benz SL-Class Experts