I just got a 02 Montero sport and now the battery is dead. I checked that Alternator and it's putting out 14+ Volts. The battery is no good apperantly however when I yanked my optima out of my accord and put it in the Montero it would start but now won't idle unless I put a load on such as the A/C. Any help would be great since I need to drive this thing at 5AM.

PLEASE HELP!! REPS WILL BE GIVEN!!!