I have a 91 190E, it's been well maintained and has 140,000 miles.
In Dallas where I live you have to have a smog inspection which was done last week. When I got home I noticed the battery light on very dim, the brake light on very dim and when you put in in gear the ABS ligh also comes on.
It starts and runs fine. I haven't driven it too far till I find out what the problem is. Anyone have any ideas?

alternator brushes worn, battery not getting good charge electical system will fail if it dosnt have enough power to maintain it, replace alternator or carbon brushes, also check the tention of the belt first