warning bells?
 

My 2012 5.3 Silverado is getting strange. Last weekend I heard what sounded like the door dinger going off. Then I noticed my voltage meter was normal and then down to 12v. I would shut it off and restart it and it go back to 14.5 v for a while. I changed the alternator and the voltage is stable now. But now when I hit the brakes the bell dings 4 times each time. No check engine lite comes on.What can that be?

Bad battery or loose battery cable(s) or ground wire(s).