No Juice to Anything

The factory fusible link at the firewall has a harness connector that serves as a disconnect for everything in the cabin. To burn the link open suggests a short circuit in something before the fuse panel. Amp gauge, ignition switch, headlight switch, who knows. If you expect to simply replace the fusible link and carry on, buy 2 of them. You can start hunting the actual problem next time the link fails. Dont install a higher gauge fusible link either or you may get a fire in the cabin. Good luck