Aux Battery Help
Thread Starter
Member
Joined: Apr 2002
Posts: 229
Likes: 1
From: Bay Area, CA.
2001 CLK320, 2003 E320
Aux Battery Help
I was hit with the Red Battery warning and it ended up to be the Aux Battery. I replaced the Aux today the red warning is still on.
When the engine is running the rear battery indicates a charge but the aux battery doesn't.
I'm thinking it's one of the relays..
Any help is greatly appreciated.
When the engine is running the rear battery indicates a charge but the aux battery doesn't.
I'm thinking it's one of the relays..
Any help is greatly appreciated.
Last edited by 2001CLK; Aug 25, 2012 at 02:40 AM.
Senior Member
Joined: Mar 2011
Posts: 396
Likes: 1
From: SF Bay Area
2004 E500
How did you determine the problem was your Aux Battery? How do you know your aux battery is not charging when the engine is running? I've got the Red Visit Workshop Battery message also, but haven't figured out how to check the aux battery voltage properly; the main is 12.0 volts standing/14.0 volts charging. Wondering if my main is just too low.
Last edited by spinn; Oct 1, 2012 at 11:30 PM.
MBWorld Fanatic!
Joined: Feb 2011
Posts: 1,752
Likes: 175
From: London, UK
W212 - E63 AMG
I have the same problem.
New aux relay got rid of the battery drain problem 6 weeks ago (or maybe 2 months) and the red message, but now the car drains and dies overnight and the aux battery shows the same voltage before and after a jumpstart.
FML.
New aux relay got rid of the battery drain problem 6 weeks ago (or maybe 2 months) and the red message, but now the car drains and dies overnight and the aux battery shows the same voltage before and after a jumpstart.
FML.
