Mustang wouldnt start, so I assume the battery is dead. No accessories, nothin. So, I hook up the jumper cables from my crx to my mustang, lots of sparks. Didnt like that and how warm the cables got quickly, so I was going up to unplug the stang, and all the sudden theres a loud pop and a lot of smoke.... its something just behind the battery. What could've gone wrong?