[Gearhead202]

Or if you do not want to do this yourself bring it to a shop and ask them to perform a "load test on the battery" and if that comes back in check then have them do the same thing for the alternator. But make sure when they do the one on the alternator they turn on the High beams, rear defroster, and the air conditioning. So the maximum load on the alternator is being excerted then it should tell you.