I was breaking in the engine for about 5 minutes when a spark came "seemingly" from the negative battery terminal and the whole car died, no radio, nothing. I check the fuse and one of the main fuses were broken. Changed it and still nothing. There was some melted metal on the neg terminal and there seems to be two pin size holes in the neg wire where the melted metal could have came from. The battery is still reading 12V. Could the blown fuse melted inside the neg (ground wire)? I suck at electrical problems so any help to push me in the right direction would be appreciated. Thanks