i change the battery and i change the alternator and the damn thing still loose all the juice when i leave it over night. if i run it, it is good for the day and i really don't have to worry about it, but when i am home for the night, and it is not run for a atleast 5 hours it dies. and when i am in work,which is 8 hours, i come out and its dead. can anyone tell what is going on. i am loosing hope in the bmws and i am getting angry. if you have anything, anything at please help me out.