Originally Posted by BimmerFan52

I think you're on track. What kept bothering me was not only were you not charging the battery, but the car won't stay running on the alternator alone.
Floating grounds will create havoc in any electrical system.
Did good alternator output require both the engine and alternator be grounded? Did you try just the engine grounded or just the alternator grounded?

Check alternator ground wire connections and engine ground wire, which is to left of passenger strut tower when looking at engine. Follow it down to block and check the connection there also.

Once you can keep the alternator generating voltage you'll quickly know if you still have battery charging issues.

Originally Posted by gwf545

There is a good chance that your remanufactured alternator is also bad. See my recent bad experience post here: https://5series.net/forums/topic/124...elts-replaced/

The integral regulator on the alternator will cause all sorts of problems if it is bad. The remanufacturer does not alway replace the regulator. The voltage will bounce all over the place and cause systems to behave badly or simply shut down. My remanufactured alternator was worse than the original in that regard.

Originally Posted by JerzyBoy973

It's fixed!! The parts vendor had a lot of problems with his alternator supplier and these reman units. So he switched suppliers and gave me a brand spanking new unit. SHE CHARGES!!!

Originally Posted by BimmerFan52

HOORAY !!

Now do your duty! Get out there and give it a good thorough Italian Tuneup !