- Buick Ownership
The battery on my 09 LaCrosse CXL gave up the ghost Wednesday. I did a jump and got it to the parts store and replaced the battery with a new AGM style. On the way to the parts store my battery in the DIC was reading 14.4V. Which I thought was right. Then today just for satisfaction, I look again and see that it starts out at 14.1 V then slowly drops down to about 12.7V. I'm freaking out that my alternator is bad or starting to go bad. But I've searched some and I see something about a "smart" system that may be applying here. Does the 09 have it where it knows the battery doesn't need a full 14.4V to charge so it's only sending 12.7V? I don't want to drop $300 for a new alternator overnighted if I don't have to.