My van had been sitting for a week or so in very cold temps and I ran the battery down to try to start. Hooked up to jump start and tried it a few times, letting the starter cool off between tries. Then, as the engine was turning over again, it just stopped. No power to gagues, no turn over, no radio. I still get the key in ignition buzzer but that is it! My question..... Is there a main fuse which could have been blown or do you think it is as simple as a loose battery connection? Not sure where to start looking for an issue. Please help!