Thanks for your responses so far. I've tried another battery and same problem. Right now it works perfectly one day, starts up fine, runs great etc. but then i'll be out somewhere and the battery meter will go to zero. If I leave the vehicle running its fine which leads me to believe that the alternator is running it fine, but after the vehicle is turned off, it wont start again. So if battery is fine, and alternator is fine, all it could be is the wiring, but i've cleaned the terminals like 3 times!! Could this be an ECU problem!?
Black Jeep Society Member #398