Service Battery charging system

you must have the 4.6L engine.that alternator is computer controlled,not by a regulator on the alternator,and can only be tested while mounted on the vehicle.have it tested.most parts houses will test it for free.Must have a full charge on the battery to test it.

im having the same problem,I havent brought a alternator just yet,im waiting for it to get shipped to me!...but my battery lights stay on and it saying service battery charging system on my car!....after you put your Alternator on your car stevieray1...did your car over shut down on you!

Hey guys, I have a 2006 Buick Lucerne and I'm having that exact problem with my car right now. The battery is just dying on me while I'm driving. I bought a new battery yesterday and now today it's dead. I had went to auto zone they charge the battery for me and then did an alternator test and said I neede a new alternator. But you guys said the problem was still continuing after getting alternator replace??

I'm having a similar problem myself. I also have a 2006 Lucerne and last week the Service Charge System light came on. I replaced the alternator and the car started right up. I turned it off and when I went to start it again it kept clicking. I replaced the starter thinking that was the problem but it's still clicking. Had my battery tested and its 100% charged. Why could the problem possibly be as to why the car still will not start. Every time I turn the key it's just a fast clicking!! Do you think it's something with the computer and it needs to be reprogrammed? I'm desperate for help!