1974 240D Alternator repair or replacement - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 11-27-2013, 08:27 PM Thread Starter
BenzWorld Junior Member
Date registered: Oct 2013
Posts: 25
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
1974 240D Alternator repair or replacement

Hey folks,

Seems that the alternator on my '74 240D is on it's last legs and isn't charging the battery as it should.

Can you replace the voltage regulators in them? (and if so, are those easy to get from any parts place), or does anyone have a part number, or recommendation for a replacement?

Oh yah - and what ampage is the standard alternator on the car?


Last edited by BenA105; 11-27-2013 at 08:31 PM.
BenA105 is offline  
Sponsored Links
post #2 of 4 (permalink) Old 11-28-2013, 06:25 AM
BenzWorld Elite
LWB250's Avatar
Date registered: Jan 2013
Vehicle: 82 300D,90 350SDL,90 300SEL,98 S420,97 SL500,94 S420 former W108/W112/W114/W123/W124/W126/W140/W220
Location: Tampa, FL
Posts: 4,951
Mentioned: 13 Post(s)
Quoted: 758 Post(s)
It's a standard Bosch alternator, and yes, you should be able to replace the regulator and brushes (the come as a complete assembly) for under $30.

It takes all of maybe 15 minutes to do in-frame if the back of the alternator is accessible.

If you can I would remove the alternator and have it bench tested. Low voltage can often mean a shorted diode, which replacing a regulator will do nothing for.

I believe the standard Bosch alternator is rated at 55 amps, but don't quote me. It should be easy enough to verify with Google.

LWB250 is offline  
post #3 of 4 (permalink) Old 11-28-2013, 07:56 PM Thread Starter
BenzWorld Junior Member
Date registered: Oct 2013
Posts: 25
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Thanks Dan.

Had a bit of a search online and came up with this alternator: Bosch Alternator in Canada - Canada W0133-1603777 Alternator Canada

Looks like the correct one?

Seems probably a more sensible solution just to replace the whole thing at this point!
BenA105 is offline  
post #4 of 4 (permalink) Old 11-30-2013, 05:16 AM
BenzWorld Junior Member
Date registered: Oct 2010
Vehicle: 1975 300D W115
Location: Nova Scotia
Posts: 36
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
I think that would work but it is 74 Amps (AL67X)instead of the stock 55 Amp(AL80X).

If you google "AL80X" you should find all kinds of them for sale. The 55Amp alternator is $40 cheaper on the same website you were looking at. You should try and replace the voltage regulator first, at least if it does not fix the problem, you will have a spare in you glovebox. I know on the 300D it is a bit of a pain to get the alternator out but I am not sure on the 240D.


Last edited by maclaveau; 11-30-2013 at 05:24 AM.
maclaveau is offline  
Sponsored Links

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

Quick Reply

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


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

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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

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