New to forum, serious headache with my new (to me) X5

[Brandon002]

I recently bought a used, 2004 X5 4.4i from a dealer. I basically stole this car from them. It was all fine and dandy for three weeks, until my battery light came on. I replaced the battery and the light remained, so I did the secret menu in the OBC and saw that voltage was down to 11.something at idle. I replaced the alternator and all was great for about 4 days.

Last night I got on the expressway and whomped on it a bit coming off the on ramp. A few minutes later the battery light illuminated again. I turned around and started driving home at highway speed. Everything was fine aside from the battery light being on.

Exited the highway and a few minutes later the battery light went off, but the ABC, Brake and 4x4 lights came on along with a message stating "self level susp inactive". I got the car home, parked it. About 30 minutes later I went out, started the car up and got no error messages. Drove for 10-15 minutes with no issues. This morning it still has no warning lights.

I did listen for the tick-tick-tick from the transfer case when shutting the car off and it is not present. The voltage is around 13.9-14.1 at idle with the headlights, radio and heater on.

Does anyone have any idea what could be causing these problems? I'm at wit's end here.

The new alternator was remanufactured unit and when I got home I did notice a slight whine coming from it, which disappeared after I let the car sit for a while. Could these problems be caused be a voltage spike or drop from a faulty reman alternator? Someone help, I absolutely love this truck when it's running great. It's the newer 315hp model, has the sport pack, premium pack, shadowline trim, titanium grill, nav, heated front and rear seats, pano roof. I just wish it was a mechanical problem (easy to diagnose) and not an electrical one (which I hate working with).

I have read so many different things online, but figured I would ask as I can't seem to find anyone that had the suspension warning along with the other lights.

Help a long time BMW owner and new X5 owner out guys!!