5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
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!
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.
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