Burnt Fuse Box Wire

1990 Deville 4.5: One of my fuses burnt out and the whole wire burnt with it. It is the fuse for the power locks and all interior lights. I put the wire to an extra fuse but the locks still do not work. If somebody could tell me how to follow that wire and where it leads to, I know that the wire goes up to the passenger side door and leads up into the dash but it gets really confusing after that....PLEASE HELP