Alternator Failures? - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 04-15-2016, 08:43 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Feb 2010
Posts: 5
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
(Thread Starter)
Alternator Failures?

My 2010 E350 4Matic battery runs down after two weeks. I am now on the second alternator and battery has run down again. Car only has 40,000 miles. Put a volt meter on the the alternator and it is charging at the rate of 13.2 volts. My 2016 C300 puts out 14.3 volts and my 2006 BMW puts out 14.3 volts. When the new alternators were installed they would put out 14.3 for a while and then it would drop back after about a week. Shouldn't the car be putting out 14.3 all of the time? I took the car to O'Reillys and they checked the alternator and their equipment indicated an internal regulator failure. I have taken the car to Mercedes and they can't find anything wrong and they said that my car does not have to put out 14.3 volts all of the time. I DISAGREE! Why do my other cars (including my 1970 SS396 Chevelle put out 14.3 volts all of the time?
dbuchholtz is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 04-15-2016, 09:04 AM
BenzWorld Elite
 
Kajtek1's Avatar
 
Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Posts: 31,792
Mentioned: 9 Post(s)
Quoted: 1127 Post(s)
13.5V is battery maintaining voltage.
On deeply discharged battery the charging voltage will go to 14V, but 14.5V some manufactures use for fast charging is shortening the battery life.
When you measure 13.2V on alternator what was battery voltage showing?
I would do a test with turning all lights, blower and rear defogger and observe how voltage change.

Kajtek1 is offline  
post #3 of 3 (permalink) Old 04-15-2016, 09:59 AM
BenzWorld Elite
 
Date registered: Mar 2007
Vehicle: 2000 SL320, 2001 CLK320
Location: Cape Town, South Africa
Posts: 1,845
Mentioned: 5 Post(s)
Quoted: 216 Post(s)
13.8V is standard industry output of an alternator, likewise the charge voltage of an AC/DC charger on normal charge.
rorypff is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome