I would replace the wires/terminals that were affected & it sounds like the poor connection that overheated was at the ammeter. get the new stuff clean/tight. Nachos' bulkhead parallel bypass is a very good seperate move (but proactive) if the problem was at the ammeter. Elim the (2) pairs of male/female brass terminals for the main in/out wires & solder in 2 lengths of wire in the drilled out cavities. Not sure if too much heat from soldering will mess up the fusible link so use clip on heat sinks or just be carefull with the heat travel. leave ~5" of wire length(s) behind the rear bulkhead half under the dash so if you have to seperate the bulkhead in the future you can pull the front half out/forward. clean the rest of the brass terminals while you have it apart. easy bristle brush the male ones & use a spare male terminal on the female ones, a spare or NAPA 725147-99 cents for new. spray em clean with brake kleen then see a computer/electronics store for a recommended conductivity enhancing paste to put on em to inhibit corrosion on down the line.