Case tr270

Having problem with my 2011 case tr270. Just bought this machine and was running fine, decided to run air conditioning when I flipped the green lit switch to turn on the air the engine was dragged down and stalled. The problem is now there are no lights or power in the cab, on the instrument panel, no beeps, nothing. Did I blow a fuse? I tested power at the starter on the large cable and there is power there. New battery and ground cable. Switch key appears fine.

Case tr270