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

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post #1 of 4 (permalink) Old 11-27-2013, 09:27 PM Thread Starter
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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 09:31 PM.
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post #2 of 4 (permalink) Old 11-28-2013, 07:25 AM
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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.

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post #3 of 4 (permalink) Old 11-28-2013, 08:56 PM Thread Starter
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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!
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post #4 of 4 (permalink) Old 11-30-2013, 06:16 AM
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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 06:24 AM.
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