jpilk99, this thread might have similar problems / help, related to your situation. Since it came out about the same time yours did, I may have mixed up his problem with yours. But I usually try to make my answers generally correct, so that probably still applies.

https://xoutpost.com/bmw-sav-forums/...ising-bit.html

Hope you get good test results.

I was servicing my cooling system and took out the aux water pump. I connected it to 12v and nothing happened.
I guess it's dead...
I just ordered Hella auxiliary pump for $140 CAD from Rockauto
Another option would be Airtex for $350, but I think that's a bit too much.
I took apart the dead pump and it looks like it's easily rebuildable if you know what to do :)