Power to everything Nothing works

64 Belvedere, went to start, cranked for 30 seconds then no crank, nothing.
Nothing as in nothing electrical works.

Traced everything, pulled bulkhead connector apart and cleaned.

Power to starter, bulkhead on both sides, ammeter on both sides, fusebox, ignition switch, fan switch, brake light switch, light switch, high beam switch, etc.

Everything receives and sends power as and when it should, for example, headlights get power when switch is turned on but do not light up.
Same for everything else, everything, including ignition switch.

Splice sends power to everything, no blown fuses, both constant and switched circuits receive/send power.

Double checked fsm wiring diagram just to be sure.

I noticed when I turn on anything, ignition switch to run or accessory, light switch, fan, hit the brake, the solenoid wire coming off the starter, not connected to the solenoid, lights up the test light.

I don't believe that's correct, had to check my other 6 cylinder car just for a sanity check.

What is going on here?

Had to edit this, did I miss the obvious, the battery ground on the engine block?

I thought I replaced it, but possibly just the terminal.