Go Back  MBWorld.org Forums > Mercedes-Benz Sedans > S-Class (W221)
Consumer Battery Not Charging >

Consumer Battery Not Charging

Notices
S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Consumer Battery Not Charging

 
Old 05-21-2013, 09:39 AM
  #1  
Member
Thread Starter
 
Join Date: Jun 2010
Posts: 116
Likes: 0
Received 1 Like on 1 Post
2007 s600
Consumer Battery Not Charging

I have a '07 S600 with a draining consumer battery.
I finally went ahead and replaced both consumer and starter batteries.
Charged them both reading 12.79 Volts holding steady.
Started the car and at the starter battery voltage reads 14.49 Volts from the alternator.
At the distribution box, the consumer battery reads only 11.99 Volts and starts dropping gradually until it reads 9.3 Volts. Accessories start to shut down one after the other.
Now if I rev it to 1500 rpms for 2 seconds the voltage goes up to 13.49 Volts and stays there. The consumer battery begins to charge then at idle.!?!?
I don't know what to do next.
Do you think a fuse or relay is fried or is it the voltage distribution box acting up and not linking the charge ??
It seems you have to rev it to excite the charging of the consumer battery.
That should normally be charging at startup, correct?
Thanks to all for any help on this issue.
Attached Thumbnails Consumer Battery Not Charging-terminal.jpg  
greekviking is offline  
The following users liked this post:
Stanley Davis (04-15-2019)
Old 05-21-2013, 01:00 PM
  #2  
Member
Thread Starter
 
Join Date: Jun 2010
Posts: 116
Likes: 0
Received 1 Like on 1 Post
2007 s600
I remember I accidentally touched the positive cable from the consumer battery a split second to the chassis. It sparked but no fuses were blown anywhere I could see. However, inside that prefuse box are numerous fuses that are not visible to us.
Do you think one of these fuses could be blown preventing the charging of the consumer battery at idle?
When you rev the motor up a bit, the higher rated fuses work and charge the consumer battery?
Attached Images  
greekviking is offline  
Old 06-20-2017, 04:12 AM
  #3  
Newbie
 
Join Date: Jun 2017
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Mercedes s class w221
Hi mate how did you solve the problem? I got the same problem on S class w221 2008 S 320 cdi. I don't know what to do I have change the bough battery front and rear.Have you solve the problem?
Danny blackpool is offline  
Old 07-20-2018, 01:48 PM
  #4  
Newbie
 
Join Date: Jul 2018
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
S550
S550 problems

Originally Posted by Danny blackpool View Post
Hi mate how did you solve the problem? I got the same problem on S class w221 2008 S 320 cdi. I don't know what to do I have change the bough battery front and rear.Have you solve the problem?
Did anyone ever figure out the fix ? Was the prefuse box the culprit?
Baulan Roth is offline  
Old 07-20-2018, 04:43 PM
  #5  
Member
 
Join Date: Mar 2018
Posts: 98
Received 10 Likes on 10 Posts
2007 C216 CL600
It could be the "Vehicle power supply control unit" (Bordnetzsteuergeršt) that controls the charging of the batteries.
It is an active module that decides which battery is charged when.
Jaap is offline  
 

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Consumer Battery Not Charging


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: