Question about Mercedes-Benz E350
Occasionally, battery in my 2008 350e drains over night
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Posted on Jan 02, 2017
SOURCE: Battery drain
When the car is shut off, there should be a very small load on the battery to keep the clock running, the security system on etc. But the amount of current is really small. If the battery is dying overnight, something is loading it;
Charge the battery right up.
Have ignition off, doors and trunk closed, no interior /exterior lights on and leave the driver door window open.
Take a fairly large automotive bulb like an 1157 or even a headlamp.
Disconnect the negative terminal on the battery.
Connect one wire to the negative terminal of the battery from the light, and the second light terminal to the negative battery cable you diconnected; connecting the light in series. Don't put the negative battery terminal on the battery.
The bulb should not light if all your ignition system is off and you have no lights turned on.
Turn on the lights or blow the horn by poking through the open window without opening the door, the test light should light and the horn sound.
If the light lights without anything being on, then you have something constantly draining the battery.
Go to the fuse panel and remove and re-install each fuse one at a time from every circuit. You may have to close the interior light door switch by pushing it with something while you are getting to the fuses so the circuit is in the off state all the time. Everything has to remain off.
When the light goes off when you removed a fuse, that is the circuit which is loading the battery. Check the fuse description for the circuit affected.
My guess is a trunk light that stays on even when the trunk is shut. If it is a lighting system fuse causing the problem, remove the trunk bulb and replace the fuse. If the light goes off, the trunk switch is defective keeping the light on all the time.
You can also place a battery charger on the battery (connect the negative back on the battery) and go and check the car in the dark. Is there a light on like a floor lighting in the interior? Do you have a light on under the hood that can't be seen during the day?
Always make sure you have a good charged battery, and that the terminals are really clean before you start analyzing the problem.
Does the alternator charge the battery? Check by measuring the volatge across the battery engine off, no charger connected; should be 12V or close.
Start the car, the meter should read 14V or so, but more than without engine running. If not, the alternator/charging circuit may be the real problem.
Posted on Aug 24, 2009
its the sensor in the brake pedal, happens mostly at cold nights since cold weather loosens up the pedal it causes the pedal to go down by itself if like you were braking, I used to roll up the matt and put it underneath the pedal and that would put pressure upwards while i was researching on how to do it myself found out is complicated and decided to take it to the mechanic for a 200$ fix.
Posted on Jan 25, 2010
One by one, disconnect the fuses until you see no change on a volt/ohm meter connected to the battery with the engine not running.
Posted on Mar 06, 2010
From what you're saying here, I believe that you simply have a bad battery. Most batteries only last 5 years, much less if they're left to sit in storage periodically. You really should charge the battery overnight and do a load test on it the next day. The person(s) you spoke to at BMW were probably sales staff and not actual technicians. Costco has very good batteries at reasonable prices.
Posted on Mar 24, 2010
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