Got into my 2001 WJ 4.7 to take my boys to a movie. Heard a constant dinging and saw a light lit up that read "Check Gauges". The only gauge I saw that looked off was my Battery Gauge, it looked low. Saw the movie got in the jeep, it started but on the way home the needle just kept dropping. Got home pulled it in the garage, shut it down and tried to restart 3 minutes later...dead. Sounds like the alternater to me. any other thoughts? Charging the battery now, hopefully enough to get me the 16 miles to work at 5 tomorrow morning. I can work on the altenator there if needed. Do I need a Mopar one or will a napa/autozone one be good enough?