Troubleshooting help wanted!

The headlight switch does not get its power from the ignition switch, but does receive power from the Fusible Link, which then goes thru the bulkhead connector to the headlights for a total of twice. You can use this tidbit in your diagnostics.
Same situation for the brakelights except now, the bulkhead connector is only traversed once.
Power for the radio comes from the ignition switch, but only traverses the bulkhead connector once.
If nothing at all works you gotta suspect the F-Link and the Bulkhead connector......... but, the connections at the ammeter are a known trouble spot. If you go there, disconnect the battery first! as those posts are very close to the pedal support. And if you decide to take the cluster out, they get real close to the dashframe if I recall correctly. Be safe.
Good luck.