tailights do not work

What is your question?

I have read many posts on this subject but need a few more ideas. My son was trying to replace his radio and shorted out many things in his car. I have replaced all the blown fuses and now only the taillights and parking lights do not work. I have read many post about the little yellow box which I went to junkyard and replaced even though mine did not appear to be broken or burned. They still still did not work. I need any other ideas anyone has