For the last three days I have had to jumpstart my X5 after work. First thing I did was check the battery. I have an OEM BMW battery currently installed, it has an indicator on that shows a color of its current state (yellow = replace, black = insufficient charge, green = fully charged. My battery is showing black/green. With the help of a volt meter I found it reads well over 10 volts when the car is off and close to 14 volts when the car is running. I am under the impression this battery is ok and that my Transmission position switch might be faulty. When I purchased this car over a year ago, the owner told me that when he bought it, the car did not start. He cleaned the position switch with contact spray and cleaned the corrosion off the plate it grounds to. After that was done the car ran ever since ( a year and seven months ). I noticed that sometimes the light on the auto shifter never goes off. Would replacing this switch fix my battery drain? Through little research I found multiple threads on a ac blower resister? And suggestions will be appreciated!