Alright, sounds good, but after I took it out, I put it back in so I wouldn't lose it. The car won't start (as if the battery is dead, but it isn't), but it WILL start when I jump the car. It's been having this problem for a few months, and I keep searching and checking bad wires, and I'm not finding anything.

I've replaced the battery connectors twice now, so, could it be the battery? I know the alternator works, because once the car is started, it is fine and doesn't lose power. But when I turn the car off, the power tries to start, and just dies away, it seems.