jeff20578

a long story short, my brand new car battery wont keep a charge. all interior lights, alarm and night settings were left off overnight. the alternator was checked and ok. what could cause this???

thanks

some more info that may help: battery was tested and is fine. i kept the car in the garage for a week and it started up just fine and decided to leave my car outside in my driveway overnight and the battery was dead. I can easily jump it in the morning and it will start threwout the day but not the following morning.

Ghostteck

thats sucks to hear man.. i was going to say the alternator but if thats checked out fine im not sure good luck on finding the answer

Howitzer

Uh, only thing I can think of is the Alternator. Its gotta be.

schulrog

hmm something is drawing a lot of power and not turning off properly when the car goes to sleep. I'd make a list of all electrical mods done to the car since you got it and go through them step by step.. perhaps you can locate what's causing this.

jeff20578

no mods done to the car, 100% stock

schulrog

oh. hmm hard call then

NoName545i

check and see if your battery connection is loose... i had this problem and turned out the connector was loose according to my dealer

luigi524td

If your charging system output is better than 12V at idle, your battery may not be able to hold a charge. It is not unusual for a battery to show OK and even show 12v when checked with a VOM.

But it only takes one bad cell to prevent the same battery to stay sufficiently charged even just overnight.

Ghostteck

I agree with Noname if its not your alternator open up the trunk and check to see if the battery is connected properly

za3879

I'm having a similar problem. Check my thread just under this one...