Please Help? I have a 05 c230, my problem is that the electrial system drains itself after about 10 days of not driving or starting the car. The car has seen roadside twice to be started and the battery was replaced once my them. It was also serviced by my mb dealer for this issue, There answer was we replaced the battery and did an electrial system check that found nothing wrong. I have checked the ALT voltage myself to make sure it was charging which it was, when I park the car I now make sure all the ACC's are turned off and no aftermarket ACC's have been installed. I'm at my wits end a 30+ thousand dollar lemon, it also has had the A/T seal leak, several NAV/Audio issues, SRS sensor failure, and a few more all in 7000 miles and 14 month any help would be greatly valued[/FONT]

 

Search on electrical problems in this forum....I remember a long thread that included canbus and seat modules draining the battery.