okay I have a new battery, a new alternator, I've tested the ground wire and the positive wire. I can still not find out why my battery is not charging. I can drive it around for few days after putting the battery on my bench charger but it still goes good with in a few days or a day off long driving with starts and stops. Any suggestions would be more than helpful. Contact me at cwagener12/yahoo/com. or of course post on here thank you and God bless BMW