Dear X Heads,

I own a 2003 e53 X5 that was well maintained with low miles. 106K. I recently changed the batter now a chain of events have developed soon after. Headlights blown 2x, AC AUx Fan motor blown, Brake Lights blown and just recently my AC Fan stopped working. Im beyond frustrated. Im a diyfer and have gotten my hands dirty already. But can someone please tell me what it can be?

Thanks in advanced.

RUddy