Hmm... i hope you didn't fry the computer, but that is a posibility as the capacitors hold charge and you put the oppisite on it...
the wire for ground also hooks up to the body of the car, so you put a hot across anything typically grounded to the body of the car, and in some cases, i think that could cause a short. Searching the forums i read some things about a fusible link that could get blown... problems that can cause with the alternator or (my own thought) ignitor... maybe if your lucky, it would be the ignitor or a blow fuse.
Good luck...
