electrical gremlins

I would check the fuse link "under load" because if everything is shut off it can conduct "just enough" (if bad) to send you on the wrong track. So turn on the ignition, and headlights, and hook your meter to ground. You should have 12V on both ends of the fuse link. Then probe "right into where the fuse link enters the bulkhead connector. You should have battery power there. If you nothing at all, no dome, no headlamps, no ignition, I'd first suspect "right in" the bulkhead terminals. Dissassemble the bulkhead connector and clean and inspect. They are a HUGE problem

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