No crank no start

1972 Dodge sportsman/rv
Ok so I had a crank no start issue to begin with. Orange spark but was able to arc across about a half inch gap.(New coil, points and condenser) And fuel to the carb (new carb and mechanical fuel pump only have about 200 miles on them
Figured ignition switch. Dash mounted so no big deal, just plug and go. Picked up a new one (used the original cylinder lock) swapped it out, tried to start her got a short half hearted crank and then nothing. All power gone. Don't even have headlights now. Although if I jump the starter relay she cranks but won't start.
Battery is at 12.5
Voltage at starter relay 12.5
Voltage at starter 12.5
And wire from starter relay to ignition switch 12.4
But no power anywhere else.

Ground from battery to block and battery to firewall are good
New starter relay
New battery cables and connectors
New ballast resistor
And new ignition switch.
Still no power.

Not sure how to test NSS but I know it's the original one. Last owner obviously hacked up some of the electrical. And bulkhead connectors aren't in the greatest shape (had to bypass the fusible link from the battery that goes to the amp gauge about 2 yrs ago)
Up until this never had any problem other than when the fusible link went.