hey guys, im having some electrical issues with my jeep, i have a 97 4.0 2wd, it wont start rite now but if i have someone jump me i can power brake the thing around, the jeep has been doing this the last couple weeks, the first thing i thought it was, was the battery the one that was in there had a cracked post so i figured it was having intermittent shorts, so i went out and spent $200 on an optima and not even a week later it does it again. today i got in the jeep it started up fine, i drove to 7/11 to get a drink, come back out, turn the key and all i get is a click? how did the battery loose power? idk. also yesterday i was driving my girl to get her hair did and the check gauges light came on and the battery voltage was all the way up to 19. what causes that?! rite now the jeep wont start at all and the lights dont even come on when i open the door. could this be alternator? voltage regulator? im just stumped... any input is appriciated. thanks!