2003 dodge neon battery light came on and car soon stalled ..had the battery and alternator checked at 2 different location and they said both were good. i charged the battery and started the car .. voltage read 13.9 .. all good ! .. after driving the car for 5 minutes the battery light came on .. i checked the voltage again .. 10.8 .. not charging ! .. im guessing something in the alternator is getting hot and kicking out ? .. any thoughts ?