Aux Battery replacement

Mar 11, 2014 | 09:10 PM

Xattica

Thread Starter

Member

Joined: Sep 2012

Posts: 209

Likes: 5

From: Puerto Rico

2016 AMG GTS Stage 3

Aux Battery replacement

Hi,
Is time to change the OEM Aux Bat. Panel has the ugly red message. I have been reading about the replacement. But don't have the final answer.
Do I need to disconnect the negative from the main bat? Or I can just replace the aux battery?

Thanks.

Mar 11, 2014 | 10:04 PM

211.070

Super Member

Joined: Jun 2012

Posts: 714

Likes: 7

From: Atlanta, GA

2005- E55, 2007 GL450, 94 B3000

It is not necessary to disconnect the main battery during the AUX battery replacement.

Mar 12, 2014 | 12:44 AM

James M

Senior Member

Joined: Jan 2010

Posts: 333

Likes: 3

From: JHB, South Africa

03 E55 AMG

You don't need to touch the main battery, just whip the aux out and replace.
Before you replace the aux, I suggest you either go to a battery shop and have them check that it is not your alternator or voltage regulator. If you have a multimeter then just check it yourself. The aux battery should give a reading of 12V or slightly more when disconnected from the car, if the reading is around 10.5V, then chances are it is your aux battery. When connected to your car with the engine running, the aux battery should read around 14.4V, if not then you may have alternator issues.

Mar 12, 2014 | 06:07 AM

gmphertford

Member

Joined: Oct 2013

Posts: 78

Likes: 1

S Class

When you have replaced the battery u may have to clear faults codes to get rid of red light off dash. Check alternator after to make sure charging.

Mar 12, 2014 | 07:42 AM

novae500

MBWorld Fanatic!

Joined: Jan 2009

Posts: 3,182

Likes: 15

From: Northern VA

W211

See that this is an 05 and if the aux battery hasnt been changed, it would be a good time to change it now.

Mar 12, 2014 | 08:08 PM

Xattica

Thread Starter

Member

Joined: Sep 2012

Posts: 209

Likes: 5

From: Puerto Rico

2016 AMG GTS Stage 3

Thanks a lot!
Tomorrow I will check the whole system! I have been reading about get the Aux bat on autozone or pep boys. Any recommendation?

Thanks again.

Mar 12, 2014 | 08:18 PM

Toadster

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Joined: Dec 2011

Posts: 4,066

Likes: 37

From: Folsom, CA

2005 E55 AMG

check the parts thread -pretty cheap < $70 online shipped

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Mar 13, 2014 | 10:52 AM

ArmoE55

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Joined: Jan 2011

Posts: 2,159

Likes: 160

2006 E55

How difficult is it to replace the Aux battery? With simple tools, is it a DIY?

To be honest, I don't even know where it's located under the hood hahaha. Is it under a cover?

Mar 13, 2014 | 01:33 PM

#10

Toadster

MBWorld Fanatic!

Joined: Dec 2011

Posts: 4,066

Likes: 37

From: Folsom, CA

2005 E55 AMG

Quote:

Originally Posted by ArmoE55

How difficult is it to replace the Aux battery? With simple tools, is it a DIY?

To be honest, I don't even know where it's located under the hood hahaha. Is it under a cover?

very easy - with basic tools, it's under the passenger side filter cover - one simple nut to access that

http://e55-amg.blogspot.com/2013/03/...t-ordered.html