I drove my new e36 to work today and it was just fine the way there. After work the battery was dead as a duck, only faint cluster LED's could be seen shortly. I noticed quickly that the positive battery cable was loose and not all the way on. After tightening down, i figured power would be completely restored(cause if the battery wasn't connected, at couldn't be using power). The car still wouldn't start all though i got some more light and i had to jump it, once jumped it stayed on and had no problem running, so most likely not an alternator prob. Anyway, the Question, Would a not tightened battery cable drain the battery, or do i need to look for another problem?