I was making an hour and a half drive back home tonight when I got about half way my alt stopped charging. I was driving down the road and my voltage was sitting at 14.8 as usual when all the sudden it dropped to 12. I thought maybe my volt meter is messing up and then I looked on my 80prs and it was saying the same thing. So I went ahead and drove the rest of the way and during that time it went from 12 to 11.7 but after I got back home and turned my car off the batts floated back up to 12.2. So two questions are my batts fine and did my regulator go out or what it the deal?