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Message: <blockquote data-quote="wan520i" data-source="post: 454208" data-attributes="member: 1625">moots,  Is there a 140 amp alternator for E39? if you are happy with 90 amp alternator, suggest you just go ahead change those parts. About the slip rings, are they so badly worn? do you really need to take care of it? I mean normally carbon brush is much easier & faster worn compare to slip rings, doesn't it designed such way? Eventhough your slip rings are worn, I believe it still can be used (to conduct cuurent), and I think there are some springs at another end of the carbon brush to push them onto slip rings right? You noticed the battery light flickered twice when you floored the accelerator..., this probably due to the carbon brush had shorten that caused the springs lose some force to push it? another possibility is due to dirty contact between the two..? just my .0002 cents, come on, you are much much better & capable engineer for DIY, me just kay-po-chee la. Err..., btw, do they have 140 amp alternator in aircraft as well? hehe...</blockquote>