Quote:
Originally Posted by andrewwynn
See if the E39 will let you use the hidden menu like E53 to verify realtime voltage.
A single dip below 12v will put E53 into a minor version of limp home mode (many things disabled but engine performance still ok).
If the voltage is dropping as described your alternator Already has failed.
Usually the cause is dirty or worn slip rings or brushes. I'd you have the Valeo model there is a slip ring kit for $20 that is about 6/10 difficult and takes maybe 60-90 minutes to perform (on alternator already removed from the car off course)
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It wouldn't crank when she got back home so that's not a minor dip in voltage
The alternator is 21 years old and has 240k miles on it. Its the factory alternator. I think it deserves a new one not a rebuild at that point.
It earned its rest
