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I always suspected my battery was being drained in this car and I can confirm now that I got a new battery.
After a few days of sitting, the car would not start and needed to be jumped.
What are some common areas where this problem could be occurring? Ill do the proper battery drain test using the meter but if I can single out some common problems, it would be more efficient to start with those.
I always suspected my battery was being drained in this car and I can confirm now that I got a new battery.
After a few days of sitting, the car would not start and needed to be jumped.
What are some common areas where this problem could be occurring? Ill do the proper battery drain test using the meter but if I can single out some common problems, it would be more efficient to start with those.
Had this issue on mine when the car is in the garage: for a few months at a time without starting.Ate a few batteries when i learned that if you turn off the anti theft ie switch on dash with tow hook icon,it solved my issue.
1999 Mercedes C43, 03 SL500, BMW 540i/6. Alfa Spider
I've been having the same issue with battery drain. A one year old battery and after sitting two weeks, battery is completely flat ( not even dash lights). I'll give this a try.
Have you tried testing each fuse to see what the current draw is when the car is off?
Test the fuse/fuses that power the tow/anti-theft features when the car is turned off. If current draw is minimal then the problem may be with a different module or accessory.
I suspect that the current draw would be 50 to 150 mA (just a rough estimate).
My W209 CLK had the same problem. The seat module ended up being defective and would drain the battery within 24 hours.
biggest thing for me was my radio i sat in my car off once for 30 minutes and the radio flicked on for a couple seconds and turned off. turned out the radio wasnt fully turning off when the car was off. a work around i found was to actually turn the radio off before i turned the car off and the drain stopped
So some things in my car aren't connected yet since I'm still sort of working n the car. Passenger seat wires are disconnected and a few things behind the center console where the radio and ac are. Would this cause battery drain?
It's possible that not having some modules connected could cause a battery drain.
For example, if a W202 is driven with the climate control module disconnected, then the auxiliary fan will be constantly on while driving...even if the engine is cold and A/C is not turned on.
I would suggest connecting everything back to stock configuration and then see if the problem persists.
If it does, remove each fuse and use a multi-meter to measure the current draw between the fuse's terminals.
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