hey i own a 2000 mustang gt, Today i was working on it, installing a new stereo. Well there is a memory wire on the stero that needs a constant power, So me being stupid i left the battery connected and ran a wire from the battery positive through the firewall behind the dash into my memory wire, well i hit something back that the created a big spark, then a rapid clicking sound, followed by nothing. Hooked everything back up and the car wont start, no key noise, no crank, no lights, no headlights, no horn, no anything... Whenever you turn the key all you hear is one click and thats it. anyone have any suggestions as to whats broken? btw the battery has perfect voltage and is brand new so its not bad.