malfunction of Electric consumers
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Newbie
Joined: Sep 2012
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Mercedes W204 C200K
malfunction of Electric consumers
this information always appears on cluster of w211 E240. the main battery runs out quickly after a night. I checked the charging to battery, it is ok, but I could not find any reason that the main battery runs out quickly, even it is new battery. Someone can tell me why?
Thread Starter
Newbie
Joined: Sep 2012
Posts: 12
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Mercedes W204 C200K
I switch off all consumer and key off car, the battery voltage drop about 0,23V after 2hours. When I connected the das to car and saw that the discharge value was about 8A, it is so much, so after 1 night the battery is exhausted and can't not start the car. Someone has any good idea to help me
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Joined: Mar 2006
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From: Louisiana
03 E500 and Corvette
Voltage isn't the key here amperage is. What you must do to confirm current draw is have an ampmeter that will measure about 10 amps. Put it in series correctly connected to the Neg. terminal of the batter, Close the trunk wait about 15 min then check for current draw. If you have .075 amps or so you are ok but my guess is you are 2 to 3 amps which will kill the battery. Disconnecting the neg terminal will work to prevent it going dead over night. Check my post about being stuck away from home.
Thread Starter
Newbie
Joined: Sep 2012
Posts: 12
Likes: 0
Mercedes W204 C200K
Voltage isn't the key here amperage is. What you must do to confirm current draw is have an ampmeter that will measure about 10 amps. Put it in series correctly connected to the Neg. terminal of the batter, Close the trunk wait about 15 min then check for current draw. If you have .075 amps or so you are ok but my guess is you are 2 to 3 amps which will kill the battery. Disconnecting the neg terminal will work to prevent it going dead over night. Check my post about being stuck away from home.
1st- How can we measure amps if we close the trunk?where can I have to measure
2nd- we suppose that the measured amp is about 2 or 3 amp, what can we do next? which part is faulty? I checked and see that all electrical consumers are switched off after removinf key from car/
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
You will need an ampmeter good for about 10 amps two long wires with clips.
Remove the negative battery cable and do not connect this cable to the battery.
Connect the two leads from the ampmeter one to the neg cable on the battery and one to the neg cable that is not connected. Make sure you have the polarity correct on the ampmeter to prevend damage to the meter.
Some meters have a diode to protect them and I dont know what you are using.
Then close the trunk on the wires to the ampmeter with the meter outside the trunk, wait about 15 min and then read the meter. If you have more than my guess .05 amps you have a problem. The reason you use a 10 amp meter is you can pull 3 to 5 amps before the timers time out.
Other option would be go get in trunk lock yourself in and use flashlight to read the meter, but I would NOT recommend that.
Remove the negative battery cable and do not connect this cable to the battery.
Connect the two leads from the ampmeter one to the neg cable on the battery and one to the neg cable that is not connected. Make sure you have the polarity correct on the ampmeter to prevend damage to the meter.
Some meters have a diode to protect them and I dont know what you are using.
Then close the trunk on the wires to the ampmeter with the meter outside the trunk, wait about 15 min and then read the meter. If you have more than my guess .05 amps you have a problem. The reason you use a 10 amp meter is you can pull 3 to 5 amps before the timers time out.
Other option would be go get in trunk lock yourself in and use flashlight to read the meter, but I would NOT recommend that.
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MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
I wish you the best on your choice of resolution.
Newbie
Joined: Feb 2013
Posts: 2
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From: Botswana
2000 E320
Hi All. Similar problem. Bought new front battery, new rear battery and new alternator. turns out that water got into the bcm somehow at some stage [kids i presume]. contacts were slightly corroded, and used some contact cleaner about 9 usd. Alternator and batteries cost around 800 us. expensive lesson. check the bcm and use a decent electronic contact cleaner before spending huge cash on something quite simple.
