I have 2015 gmc Sierra 2500hd with about 131000 miles on it. I have lost all power to my instrument cluster, power windows, sunroof, radio. When I turn on the key I get a chime but when I try to start it nothing. I checked fuses and load tested the batteries individually. But haven’t found anything. I did arc the alternator with a pry bar. So if anyone has any suggestions for me please let me know.

 

Welcome

pretty crude way to test the alt, don't you think? Not only can you fry it, but it doesn't tell you anything at all about it's performance or if it's starting to fail. That's what load tests are for and they're free.

Anyway, your problem sounds a lot like a bad ignition switch. You'll need schematics and a multimeter to very that it is in fact the case.