Lost all electrical power to everything?

I disconnected the battery to replace a bad alternator which was further bench tested to confirm it was bad also left the key in the ignition overnight till I did the replacement, after replacing alternator and reconnecting the battery (which is good) I turned the key forward to find no power at all to anything also the key was stuck in acc. Position I eventually discovered the ign. Release button anyway from there I've checked and metered out everything I could think of; battery connection, battery wires, battery to ground, main 125-amp fuse and all fuses under the hood and in the back under the seat and all is good? The only fusible link I found is for the alternator and it too is good? What am I missing or not catching?
Something new. Should it be showing 12 volts from either side of the (good) 125-amp fuse to ground? Because I am not, and the battery is good also.