So I recently got an 05 4.0L V6 Mustang from my neighbor. He said the car wouldn't turn over, the anti-theft light was on so he would sell it to me for pretty cheap. I took him up on that offer, so I had someone come down and try and remove the antitheft for me through his computer because it was being stubborn and i couldn't get it myself. He told me the car wasn't communicating with his computer and that's where I'm at. The car still have power, the battery is disconnected right now, but when connected it still powers on the lights and radio and whatnot. But when trying to start the car it wont turn over and the alarm keeps going off. Is there anyone else who has had this same issue?