I have a 2013 Sierra 1500 with 1400 miles in it ..I just noticed that when I start the truck the needle on the gage is above 14v. When I'm driving it it goes between 9 And 14 v is this normal on these or is my alternator already going bad ? Do far this truck isn't built as good as my 02 that had 198k on it . I'm starting to regret trading it in on this new truck .