X3 Battery Problems
I had a problem with my wifes 2005 X3 tht I thought I would pass along. About a year ago, I replaced the original battery. A month or two ago, we encountered a situation where when turning the ignition key to the "start" position, nothing happened. Everything else seemed perfectly normal.
After this happened several times, I looked at the battery & discovered that the positive terminal was loose. I tightened it, everything began to work perfectly again for a couple of weeks, when the problem returned. When I looked closer, what had happened was that the terminal was not quite pushed all of the way down on the terminal. Since there is taper in the terminal and on the battery post and the terminal not being fully down combined to cause the terminal clamping mechanism to bottom out before fully clamping the terminal.
This problem is made worse because of the long arm on the terminal back to the cable. This causes a lot of leverage on the connection everytime the car goes over a bump & eventually, the clamp walks it's way up the terminal.
In hindsight, this all seems obvious, but reading all of the posts of battery issues on X3s after replacing batteries makes me think I may not be the only one.