i was driving my jeep home tonight and i looked at the battery guage and it was holding just outside the red and the trip was about 25 miles with no movement of guage and wouldnt move when i turned lights on or off witch it normaly does do these guages get stuck sometimes its had that battry and alternator replace in the past six months

 

Sounds like the alternator isn't charging, check the belt tension and battery cables and go from there.