Hi. I'm new here. I'm looking for anybody that can tell me what the problem is with my Mustang. I was going to do some maintenance after it sitting all winter and when I started it, the starter kept cranking even though the motor was running. I had to pull the negative ground from the battery to shut the car off. Now if I put the battery wire back on it sparks. Does anybody know what the problem might be? I don't know where to start looking.