anti theft and dash issue
 

2002 jeep grand cherokee i was driving last week when i noticed my dash was doing crazy things. All the lights were on and nothing was registering (fuel, speed RPM Temp) i was able to drive it home go to work come back and it started fine and drove fine other than the dash issue. i looked under the hood and messed with the battery cable, the positive was loose and spun right off i reconnected and tightened but when i went to start the vehicle it runs for 2 seconds and shuts off, the dash seems to still be having the same issue. please help i am no idea where to start 4.0L 136000 miles. i am using the original key also my windows don't work now and they did before as long as the door was closed im guessing the wire was a little short from the factory.... did i say help please