I have a problem with a 85 toyota pickup, the brake lights,dash lights and running lights don't work when I turn the headlights on. I checked the fuse, and the person that had the truck before me apparently had a very bad short in this circuit for where that particular fuse went on the fuse box was melted and they took out the two wires and put a new fuse (30 amp) which when I replaced with a new fuse blew the minute I turned the headlights on, can you help me find the source of this problem? the brake lights, turn signals , work fine as long as I don't turn on the headlights.I have a wiring diagram for this and have been pulling my hair out for days, please help!