- Mercedes-Benz E-Class: Warning Lights
Important information to help you understand your Mercedes-Benz
Red battery message ( Visit workshop)
Welcome to the site.I would consider my test valid even with out STAR.
Ad Hoc Test Method
1) Verify Alternator, diodes and regulator fully functional.
2) full load test of the main bat showed voltage 12.6 or better engine off
3) Main battery full load cranking amps passed and full amperage load passed
4) Aux battery verifed at 12 V+ with engine running.
5) Aux battery verifed at 10 V with engine off.
Given the Aux battery is a 12 V AGM battery voltage should be above 12V when off. The 10 v indicated 1 cell is dropping out.
There were no other messages in FSS other than visit workshop. All convience items worked normal.
The alternator / regulator test verified the alternator was charging, diodes all functional (no wave pattern on scope missing).
Therefore the conclusion was the Aux battery has failed 1 cell and therefore needs replacing.
Now consider it takes me 2 days to drive to a MB dealer and 200 miles plug about 8 hours of my time. Given I don't have a Star machine I think my test are valid.
I agree the MB Star system would come to the same conclusion and had MB had dealers closer I would have used them. But given MB has been building cars since 1800's and alternators still use diodes and regulators coupled with not everyone owning a Star system there are other methods of testing electrical equipment.
I still consider my Ad Hoc method a valid test method.
But are we having fun and learning something new every day.
1 wanted $185
the other wanted $140. So I drove 100 miles to get the $140.
It is the correct battery but with the old one on the shelf I really think there is a generic in store battery we can use as replacement. Next time the car will be out of warranty and I will use the generic. Next week I plan to go to local supplier MB battery in hand to see if I can find a replacement. I really think there is one that will work.
Did partsplus cancel your order also.?
Last edited by locomercedes; Dec 27, 2008 at 03:19 PM.
The interstate looks like a good choice as replacement. I did a local store check and found one within 5 miles. My car is still under warranty but they would not warranty this battery. The owners manual states bat's are not warrantied but since this car has the sbc brakes I was wondering.....???
but guess it isn't.I still plan to take my old MB battery in hand to a local shop to find a direct fit replacement. Given I have to drive over 100 miles to get one and no one will ship I will have to find a better replacement.
Last edited by vettdvr; Dec 27, 2008 at 03:52 PM.
On another note, I just came from Walmart and they do have an Everstart maxx motorcycle battery 14BS, AGM technology for $70 with 3 year free replacement and 9 years prorated warranty. I opened the box and looks like it would fit. Everstart batteries are made by Johnson Controls, which incidentally tried to acquire Fiamm batteries (the maker of the aux MB battery) last year. http://www.reuters.com/article/merge...AS867720070430
I replaced the auxillary battery under the hood and the red message at the cluster check battery disappeared, thanks for all the ideas and the suggestions. The auxillary battery was the problem for that message.
thanks again.
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I also found a battery I think will work Interstate CYTX 14-BS and Delco GTX 14-BS. IT looks like the size is the 14-BS and the other letters determine if agm or lead/acid.
I pulled the caps off of the FIAMM bat and found acid so it looks like a lead acid battery to me.
The only thing I didn't measure was the metric bolt size in the wiring harness.
The FIAMM has a threaded post and I am not sure the others have threads but use a nut in the post that slides into the open slot.
" AGM (Absorption Glass Mat) sealed battery technology was originally developed in 1985 for military aircraft where power, weight, safety, and reliability were paramount considerations.
AGM battery technology has continued to develop and offer improvements over other sealed battery technologies. AGM technology has become the next step in the evolution of both starting and deep cycle sealed batteries for marine, RV, and aviation applications. This "next generation" technology delivers increased safety, performance, and service life over all other existing sealed battery types, including gel technology.
In AGM sealed batteries, the acid is absorbed between the plates and immobilized by a very fine fiberglass mat. No silica gel is necessary. This glass mat absorbs and immobilizes the acid while still keeping the acid available to the plates. This allows a fast reaction between acid and plate material.
The AGM battery has an extremely low internal electrical resistance. This, combined with faster acid migration, allows the AGM batteries to deliver and absorb higher rates of amperage than other sealed batteries during discharging and charging. In addition, AGM technology batteries can be charged at normal lead-acid regulated charging voltages, therefore, it is not necessary to recalibrate charging systems or purchase special chargers. "
Last edited by locomercedes; Dec 28, 2008 at 10:36 AM.
Next time I will buy this autozone battery and save the $90 from the MB tax. Note this is also cheaper than (if you could) mail order and Autozone is within 2 miles of my home vs driving 200 miles to the dealer for the battery. So consider this battery next time you need one. Hope this helps others who will need this battery.
Next time I will buy this autozone battery and save the $90 from the MB tax. Note this is also cheaper than (if you could) mail order and Autozone is within 2 miles of my home vs driving 200 miles to the dealer for the battery. So consider this battery next time you need one. Hope this helps others who will need this battery.
I just received mine today and installed it
OLD BATTERY:

NEW BATTERY:

Notice the build dates. My old battery was exactly 5 years old. Also notice the design on the top is slightly different, but size wise is otherwise the same.
After following the disconnect/reconnect procedure, I got 2 error messages ( headlight cornering and ESP). I normalized the ESP (complete wheel lock right, then left). Success! All the error messages (including the red battery message) are gone.
Last edited by locomercedes; Dec 30, 2008 at 08:14 PM.






in this pic i had to remove the pad that was between the bars and i had to bend the contacts straight the screws were a perfect fit into the holes
this confirms all it is is a glorified motorcycle battery
Last edited by Nickthegreek; Jan 17, 2009 at 03:10 PM.


in this pic i had to remove the pad that was between the bars and i had to bend the contacts straight the screws were a perfect fit into the holes
this confirms all it is is a glorified motorcycle battery
After buying a bat from the dealer for $140+ I found another good choice from Autozone would be the Autozone GTX 14-BX FG AGM for for $69.99.








Did you notice the OP solved his red battery problem by only replacing the aux battery?