With no starter, forget about the red/white and blue/white wires, that came from the starter relay.
Power comes from the battery on a red wire that then goes to the main 20 amp fuse....................confirmed 12 volts there?
Power flows from main fuse, on another red wire, to the ignition switch.....................confirmed 12 volts there?
Power then flows from the ignition switch on a brown wire .........................confirmed 12 volts on that brown wire?
That same brown wire connects to one side of the ignition fuse. You should see the 12 volts at the ignition fuse if you saw it at the ignition switch.