What's killing my alternator(s) - 280SE 4.5? - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 07-06-2014, 07:47 AM Thread Starter
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What's killing my alternator(s) - 280SE 4.5?

I've posted aspects of this question before, but the bottom line is, what's killing my alternators?

I have a 1973 280SE 4.5 purchased in August, 2011. It took some doing to get it running properly, including a new Bosch AL72X 55 amp alternator.

This alternator failed after one year and was replaced under warranty in August 2012 with the same model alternator. Then one month later, the alternator failed again and was replaced as bad out of the box. A new Beru external voltage regulator also was installed.

Things have been fine up until two weeks ago. My battery overheated and leaked. I replaced the battery, and replaced the voltage regulator with a Bosch OEM part -- accomplished all that one week ago.

Things were fine and I drove the car extensively two days ago, with no evidence of any problem. Then yesterday when I started the car, the alternator light came on. I tested at the battery with a multimeter and found that the alternator is not charging. I checked the connection between the alternator and the battery, and there's no apparent problem there. This morning I re-tensioned the belt, with no result -- alternator still not charging.

So the question remains, what's killing my alternators?

Thanks....

Last edited by ross220sb; 07-06-2014 at 07:58 AM.
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post #2 of 4 (permalink) Old 07-06-2014, 11:17 AM
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cables between alternator and regulator fals connected ???
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post #3 of 4 (permalink) Old 07-06-2014, 12:46 PM Thread Starter
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Yep -- I think I have ruled out all the obvious stuff (unless there's a short in the cable). I plugged the old (bad) voltage regulator back up to see if the alternator would then overcharge -- to rule out the new regulator -- but still got the same no charge result.
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post #4 of 4 (permalink) Old 07-06-2014, 12:48 PM Thread Starter
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Also verified that the connection between the battery and the junction and the alternator is live.
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