2007 Chevy Silverado 1500 electric issue.

I have an 07 Chevy Silverado 1500 WT with 160,000 miles. I installed a new battery and the next time I went to start the truck, I got a no crank, no start. I thought I may have been a loose battery terminal but that wasn’t it. Nothing will work in the key’s accessory mode but will work in the run position. I changed the ignition switch, still didn’t fix it. I checked all of the grounds, the starter and the fuel pump, all working. Blower runs, headlights work. The last thing I checked were the fuses. None were blown and the relays work. Then I checked the voltage on each fuse with the key on and every fuse read zero volts. The positive cable between the battery and the fuse box read 12 volts so the current seems to have stopped at the fuse box. I’ve checked everything I know to check. Any help will be greatly appreciated. Thanks in advance!