Get under your car and pull the voltage regulator out of the alternator and inspect. You need a short shaft philips head to remove it. Location is the rear of the alt.

Go to partsshop on this site to see a picture.

What lights are lit up on your dash? ABS will not function without enough voltage.

Good luck.

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E