Question about 2003 Mercedes-Benz E-Class

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Battery drain overnight on a mercedes e320 2003

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Unseen things can sometimes brain your battery. A trunk light that doesn't go off when the trunk is closed. Open the trunk and touch the bulb quickly, it should not be hot yet. If it is it's stuck on. The same goes for the glove compartment light.

There could be a problem with the alternator or even a battery that just won't hold a charge as opposed to an actual power drain. Fully charge the battery and then disconnect it for the night. Next morning reconnect it. If the charge is holding it will start just fine. If it doesn't then your battery is suspect.

Posted on May 03, 2015

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Posted on Jan 02, 2017

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Hello! I have a s500 2001Benz and our battery keep dying overnight why is this..


You have an excessive power drain from some electric component in the car and it is draining the battery power rapidly. That is, assuming you have a sound battery that is holding its charge.

You need to have some tests run to identify the source of the drain and rectify it. You will need to either have Mercedes do this or a competent auto electrician who is familiar with Mercedes systems.

The battery will not last very long if it is being constantly discharged like this due to the excessive power drain.

Furthermore, if the battery is old and on the way out it will not hold its charge for very long even if there is no excessive power drain. When the car is idle and everything is in working order, there are still systems on the car that drain a small amount of power constantly so you still need a sound well charged battery.

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1 Answer

I have a 2002 cl 600 Mercedes and just recently


Batteries have a service life of 2-5 years. It seems like your battery is in need of replacement. Have it tested, or if it is more than 3 years old, just get a new one.

Aug 30, 2014 | Cars & Trucks

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Battery drains over night I'm my mercedese E 200. What can cause it


take the positive and neg cable off then touch the positive cable to the positive pole....if you see a spark theres a wire somewhere grounding out on the frame or on a metal ground somewhere.....

Apr 16, 2014 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

Battery drains if the car sit overnight


Hello

Best thing to do is check whats using the power. If you can't find it then i suggest taking it to a mechanic. If your have anything left own over night it will diffecntly cause drainage problem.

Apr 10, 2014 | 2003 Mercedes-Benz S500

1 Answer

Battery keeps drainig overnight


You have a slow drain of power inside the car wiring. It could be a relay sticking closed, a short to ground somewhere, or a component using power when it should be switched off like a courtesy lamp.
The fuses have to be pulled to find the circuit with the drain.

Jan 21, 2014 | 2005 Mercedes-Benz C-Class

1 Answer

I have a 87 300e benz. Radio was left on and drained battery overnight. Tried jumping it today but wont start.


charge battery fully do not jump it turn key on for 30 sec than offf ,car should start

Nov 14, 2010 | 1987 Mercedes-Benz 300-Class

1 Answer

My mercedes sat for 10 months while I recuperated from injuries. The battery was completely dead. Remote didn't even work. We were able to jumpstart it with battery cables but it won't keep running. Dead...


You will burn out your alternator if you keep on doing this.The alternator is not a charger. If you have a dead battery you should always charge it overnight on a charger.To keep the battery fresh all that you have to do is disconnect the terminals.Yes this is normal because the car has clocks and alarms that drain power even when the key is off. If you let the battery set to long while it is drained it will not take a charge.

Jul 06, 2010 | Mercedes-Benz C230 Cars & Trucks

1 Answer

I have 1989 300e mercedes. If i drive and let sit overnight it will not start. Battery dead. I replaced the battery and alternator. If i charge battery for less than 5 minutes it will crank and start up....


Do the fans run properly and shut off when cars is off? If not they may be draining the battery. A bad stock antenna could drain battery because of the control module. Also the central locking pump if it keeps running (its supposed to shut off after 30 seconds) but if it fails it will drain the battery.

Disconnect each system 1 by 1 or pull fuses 1 by 1 to find out. I would believe its your neutral safety switch tho. Its on the transmission.

May 07, 2010 | 1989 Mercedes-Benz 300-Class

1 Answer

My alternator and battery tested good.


Something is draining the power. You have an open circuit somewhere. The sooner it drains(1-2 hours) the bigger the load, the more heat you should be able to detect from the drain. If it takes a lot longer(like overnight) then it will be a little harder to detect. Try unhooking things one at a time. Your alternator could be working properly when the car is running, then shorting when its off. That would make the drain fast. A light staying on under the hood or in the trunk, or dome light would make it drain slower. Or it could be just a wire shorting to ground.

Feb 17, 2010 | 1987 Mercedes-Benz Mercedes Benz 190 Class

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