e39 540i Sport, alterator dead... - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 08-16-2009, 10:48 AM
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e39 540i Sport, alterator dead...

I searched and searched, cant seem to find out if there is a part # for a new voltage regulator, or if it is even possble. Please help, I have done several of these but I can not find out if this one is possible. Thanks fellow Bimmerphiles!
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#2 (permalink) Old 08-16-2009, 11:23 AM
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What is the year of your 540i? I'm also not finding a part# for the voltage regulator for the 540i. I went to real oem where they had a diagram of the parts for the alternator but there was no description of the parts, part#'s, or price which is very unusual because it's been in my experience that the website is usually spot on.

You may have to purchase an entirely new alternator unfortunately (or rebuilt). I found this on Turner Motorsport with a $100 core deposit. It might be your best bet unless you want to go junk yard diving and try to get lucky.

Click Here for Turner Motorsport link.
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#3 (permalink) Old 08-16-2009, 11:27 AM
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Shes June of '02. I might not be possible, it's the liquid cooled one.
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#4 (permalink) Old 08-16-2009, 11:37 AM
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Right, and I'm assuming a 140amp as well. This is the diagram I found on realoem but it didn't have any corresponding parts #'s



Part#2 is the voltage regulator I believe.
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#5 (permalink) Old 08-16-2009, 04:04 PM
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Thanks for the help. I have EtK 2009 program. That is the diagram for the air cooled alternator I have the liquid cooled. Good luck...here is your voltage regulator
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