Mercedes 320 SC, 2013. New battery dead in a week

Asked by Nov 23, 2015 at 03:43 PM about the 2003 Mercedes-Benz C-Class C 320 Sport Coupe

Question type: Maintenance & Repair

Hi,  my old battery drained out rapidly,  
within a week or two sometimes if the
car wasn't driven,  so I had a new one
installed and it  too was dead within a
week.   Had it recharged and same
issue again.   It's infuriating.   Help?   
Before first battery went I noticed the
indicator lights were all flashing when
it was parked and locked but not
caused by a break in.   Anyone else
had this problem, or got any advice for
me.

4 Answers

150,545

Parasitic drain. Watch this video. Eric knows his stuff - https://www.youtube.com/watch?v=KF1gijj03_0

7 out of 7 people think this is helpful.
150,545

http://www.popularmechanics.com/cars/how-to/a5859/how-to-stop-car-battery-drains/ -is another good one

6 out of 6 people think this is helpful.
150,545

This is all under the assumption your alternator and battery cables are good, have a good ground- http://www.aa1car.com/library/battery_runs_down.htm

5 out of 5 people think this is helpful.
555

Fordnut is spot on with the alternator and battery cables. Those are common culprits.

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