Hi I’m new to hear , and I need some help please , so I have a 2010 w212 350 cdi , so the battery light came on so I managed to get the car home . The next morning I started it and went to a local garage and they tested the battery, and it was 10v so I went back home and as I got to my street all warning lights came on , so garage said it was an alternator, so I have changed the alternator today , but started the car and after a couple of minutes..... battery light on again and same thing happend , getting a new battery tomorrow so hopefully it’s that ,,,, but does anyone on hear know of any thing else this can be if it’s not the battery?? Thanks in advance