battery e320 2003 - Mercedes-Benz Forum
 
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#1 (permalink) Old 03-06-2009, 06:14 AM
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battery e320 2003

i have not used my car for two months, now battery is dead as a nail, nothing works, can't even get the key to turn, i cannot open the trunk to get to the battery, is there a way to jump start or change the aux-battery, if so where is the aux battery.

any suggestions, thanks
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#2 (permalink) Old 03-06-2009, 06:21 AM
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If you can get into the engine bay there are /is normally a place you can hook up a charger as in the factory one near the fusebox and there is also the starter motor and the alternator which definitely have a [if you can reach them] a positive terminal .Starter for a jumpstart or even to get power to the battery so you can open the boot,alternator for the same except do not jump start.ok? Kevman
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#3 (permalink) Old 03-06-2009, 07:35 AM
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I would open the trunk with the mechanical key (the metal blade hidden into the plastic key) and charge the battery.

The AUX battery is isolated with a relay, of course you can find wires from the engine bay that are connected to the main battery at the trunk.
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#4 (permalink) Old 03-06-2009, 09:01 AM
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I worked on the injectors on my cdi and believe me, there no big cable in site where you can hook up the jumper. It is W210 that has a post for jump start, but not W211.
As DB said the blade key suppose to open the trunk, otherwise I would put small charger on fuse rail to charge the car enough to open the doors and than replace the big battery
Strange that the battery went flat in 2 months. We had our older MB parked several times for 5 weeks and they always started without jump.
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#5 (permalink) Old 03-06-2009, 05:13 PM
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There ARE posts in the engine bay (passenger side, by the interior airfilter box (at least my S211 has them)), and I do believe Diesel Benz is correct in saying they can be used for a jump start or charging, but I think the manual recommends connecting directly to the battery. Note, the manual states that the engine bay posts should NEVER be used for providing jump starts to other cars.

I'd go with Diesel Benz's advice. use the mechanical key to open the trunk and hook up a car electronics safe charger (which will control voltage spikes, have no sparking, and never go above 16V. I use a Swedish made CTEK 3600 myself) to the battery posts and charge the battery. The battery might need to be replaced if it can't hold a charge, though. In any case I'd be careful, if you jump start and have bad luck or do something wrong, it can cost quite a bit of money to replace MB branded black boxes...

E class interactive Owners Manual, Jump Starting: http://www4.mercedes-benz.com/e/cars...d13e47538.html

E class interactive Owners Manual, charging the battery: http://www4.mercedes-benz.com/e/cars...d13e46908.html (with the charger I use it's not necessary to remove, or even disconnect, the battery from the vehicle. Which is why I like it.)

Last edited by snugglecola; 03-06-2009 at 05:36 PM.
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#6 (permalink) Old 03-07-2009, 01:20 AM
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Originally Posted by snugglecola View Post
There ARE posts in the engine bay (passenger side, by the interior airfilter box (at least my S211 has them)), and I do believe Diesel Benz is correct in saying they can be used for a jump start or charging, but I think the manual recommends connecting directly to the battery. Note, the manual states that the engine bay posts should NEVER be used for providing jump starts to other cars.
My W211 does not have the jump start poles at the engine bay. I understand that all Wagons have those (do they assume wagons having cargo at the trunk ).

Some sedan owners claim they have the charge pole at the engine bay too. I'd really like to see a photo from a sedan. Or could it be on the smaller engines only where there is more room. Even EPC shows some of the parts for the jump start pole that definitely do not exist in my W211.

The on-line manual is "only" for current models that are a bit different because no AUX battery etc. It anyway shows the pole only for the wagon, for the sedan they advice to connect to the battery at the trunk.
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#7 (permalink) Old 03-07-2009, 04:33 AM
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Originally Posted by Diesel Benz View Post
My W211 does not have the jump start poles at the engine bay. I understand that all Wagons have those (do they assume wagons having cargo at the trunk ).

Some sedan owners claim they have the charge pole at the engine bay too. I'd really like to see a photo from a sedan. Or could it be on the smaller engines only where there is more room. Even EPC shows some of the parts for the jump start pole that definitely do not exist in my W211.

The on-line manual is "only" for current models that are a bit different because no AUX battery etc. It anyway shows the pole only for the wagon, for the sedan they advice to connect to the battery at the trunk.
I think you're right. Taking a closer look, it certainly does seem like only the wagons have the jump start posts in the engine bay. I don't see a logical reason for this difference in design though, but I'm sure it's something. I don't think MB would put the posts in the engine bay on the wagons, and not in the sedans (W211), for no specific reason?

I checked the owners manual for my pre-facelift car to compare with the on-line manual (written for the facelifted cars), and the instructions for charging the battery or jump starting seem to be the same regardless of the design differences between the cars. The "old" manual describes the engine bay posts only for the wagons (S211), as well.

Last edited by snugglecola; 03-07-2009 at 07:13 AM.
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#8 (permalink) Old 03-07-2009, 01:21 PM
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There is always free Road-Aid on a jump...1800formercedes
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#9 (permalink) Old 09-17-2010, 11:58 PM
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I took out my 2003 E320 blower motor filter under the hood. I found out there is a small battery. I think we might charge the car from there.
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#10 (permalink) Old 09-18-2010, 03:23 AM
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Originally Posted by ewong1 View Post
I took out my 2003 E320 blower motor filter under the hood. I found out there is a small battery. I think we might charge the car from there.
Charge the car or the battery? You can charge the AUX battery but it would not be connected to the main battery at the trunk and the main battery would not get charged from the front (when ignition is off, which should be the case if you try to charge the battery).

There are connectors at the front that allow charging the main battery but none that was intended for this (or jump starting), that is on a sedan model.
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