You know when I looked at the fuse it looked like it took a long time to go not fast like a short. I think you are correct about the bad ground. The fuse went on a slow burn lots of heat enough to discolour the screw and sag the plastic. I had a melted headlight socket as well from what I think was a poor ground. Will do as you suggest and look for ground. Has to be a fare size I would think.