S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Alternator problem

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Old Dec 28, 2007 | 04:44 PM
  #1  
kor's Avatar
kor
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MB S320CDI 2001, VW Golf Variant 2001, BMW E36 328I cabrio 1998
Alternator problem

Hello all,
I had a problem with my w220 (diesel). Alternator seemed not to be charging the battery. (voltage to low<11 V)
Today I have charged the battery.
Started the car and the voltage over the battery poles was around 14 V with running engine.
Now I suspect I have an alternator problem. Loose contacts, worn brushes or something like that.

Does anyone now of a way to check/replace the brushes without taking the alternator out first?
Or are there suspect point for intermittent contacts?
Reason for this question is that taking out the alternator is a terrible job because it is a watercooled one and I would have to disconect loads of tubes and let away the cooling fluid..
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Old Dec 30, 2007 | 11:19 AM
  #2  
srknutson's Avatar
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2004 S500 & 2011 Mini JCW
I would also check the voltage regulator before taking the alt. out.
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Old Dec 30, 2007 | 11:31 AM
  #3  
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kor
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MB S320CDI 2001, VW Golf Variant 2001, BMW E36 328I cabrio 1998
Hello srknutson.
will try to do that.
(after finding out how to take it away without taking out the alternator)
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