DIY - Auxiliary Battery
Senior Member
Joined: Mar 2011
Posts: 396
Likes: 1
From: SF Bay Area
2004 E500
I left my lights on the other morning and came back to a drained battery (4th time since buying the car last year). After giving it a jump start, I got the red visit workshop light. The main battery has a standing voltage of about 12.0 volts and about 13.5 volts while running. I tried to check the aux battery, but was getting weird readings, which I don't know why it's wrong. I have not received any other message of certain components not working due to low voltage...is it likely my main battery is too low now?
Super Member
Joined: Jan 2010
Posts: 563
Likes: 31
From: The Villages, Florida
2006 E320 CDI
MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,670
Likes: 13
2006 E55, 2012 Bentley Continental Supersports Convertible, 2014 Kia Sorento SXL AWD
Anyone have experience with Carquest's auxiliary battery? I have one on order (they didn't have the right one in stock) and it will be delivered tomorrow... I know Carquest has an OEM main battery (bought one of those last month)...
http://www.carquest.com/webapp/wcs/s...82_?acesApp=0#
http://www.carquest.com/webapp/wcs/s...82_?acesApp=0#
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MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,670
Likes: 13
2006 E55, 2012 Bentley Continental Supersports Convertible, 2014 Kia Sorento SXL AWD
Well, I picked up the battery this AM... Installation took 5 minutes starting by removing the old battery and installing the new one... I think the hardest part about the dang install is getting that cabin air filter assembly just right...
Problem solved.... No more convenience features disabled BS....
Problem solved.... No more convenience features disabled BS....
MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,670
Likes: 13
2006 E55, 2012 Bentley Continental Supersports Convertible, 2014 Kia Sorento SXL AWD
Well, I guess I spoke too soon... The next morning I started the car and got the message again... Same thing that evening, this morning, and this evening. I had the alternator replaced in August following a car accident (which was when all of this mess started). The service advisor confirmed that the voltage regulator came with the new alternator and was change on this date. Both the main batter and auxiliary battery have been replaced since getting the car back (both batteries are from Carquest). I am beginning to think that the alternator, and both batteries weren't bad in the first place... The local stealership is going to run some diagnostics on it next Tuesday... Service advisor assured me they wouldn't charge me for the diagnostics since the problem wasn't correctly fixed in the first place. I am hoping they can attribute this to the accident and I can get refunded the cost of the alternator, since it wasn't covered in my insurance claim...
MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,670
Likes: 13
2006 E55, 2012 Bentley Continental Supersports Convertible, 2014 Kia Sorento SXL AWD
Well, my vehicle ended up dying at no other place than.... the MB dealer while I was test driving the 2014 S Class for the day last Friday... I returned the vehicle after a few hours only to find my E55 wouldn't start, all displays dead, no electronics working... I had an appointment scheduled for yesterday, but they worked me in early... I picked up my car yesterday and everything appears to be fine... Apparently some wire leading to the pre-fuse box was loose... Would have been nice if they found this when they replaced my alternator... Oh well, at least I won't have to worry about my batteries again for as long as I own the vehicle... And they didn't charge me again for the diagnostics...
Member
Joined: Jan 2014
Posts: 76
Likes: 11
From: 33N117W
2006 E55 AMG, 65 Nova
Hello AMGers...
Winters a coming. Checked my 2 battery's and the main was well at 12.55V but the aux was a dismal 10.3V bought one at the local but made sure it was a AGM and fit right. Thanks to the forum search all you do is remove and replace. Didn't have to jumper it. -- NO codes or other gizmos to go awray. Its all good.
Check yours TODAY!!!
Rob
Winters a coming. Checked my 2 battery's and the main was well at 12.55V but the aux was a dismal 10.3V bought one at the local but made sure it was a AGM and fit right. Thanks to the forum search all you do is remove and replace. Didn't have to jumper it. -- NO codes or other gizmos to go awray. Its all good.
Check yours TODAY!!!
Rob
Member
Joined: Oct 2012
Posts: 106
Likes: 2
From: Chandler, AZ
2001 M Roadster, 2005 E55 AMG Estate
This thread is invaluable if for no other reason than it lists the form factor needed for the aux battery. The pics are just gravy 
Thank you!!!
Was having electrical gremlins lately and woke up to a dead primary battery anyway. Figured I'd replace both. Neither sears nor autozone had the Aux battery info in their systems. But given the group size, Autozone actually did carry both primary and aux form factors. So All good! All gremlins gone!
Thanks MBWorld!
Thank you!!! Was having electrical gremlins lately and woke up to a dead primary battery anyway. Figured I'd replace both. Neither sears nor autozone had the Aux battery info in their systems. But given the group size, Autozone actually did carry both primary and aux form factors. So All good! All gremlins gone!
Thanks MBWorld!
Senior Member
Joined: Sep 2011
Posts: 384
Likes: 13
From: Sweden
E55 AMG V8 Kompressor 2004 E 55 AMG Type: 5,439 cc (5.439 L; 331.9 cu in) Supercharged V8 Powe
Please anyone how do I proceed if want to replace both batteries do I start with rear then front or other way or just disconnect both at one time in such case which one first?
I searched is so many threads but not a sinle one about this
I searched is so many threads but not a sinle one about this
MBWorld Fanatic!
Joined: Dec 2008
Posts: 4,411
Likes: 69
From: Socal, Chino
E55 2006 / CLS55 / S450 / Jag XKR2011
Reviving the old post. Not sure which one to chose. ET14B, ETX14 and ETX 14L.
Anyone knows ? thanks.
Anyone knows ? thanks.
