No power to ac Compressor

2013 Freightliner Cascadia w sleeper
Ac went out a couple of weeks ago. Compressor and dryer is new. I found out I have no power to compressor. If I put power directly to compressor my power probe blows the fuse. Ok so compressor is shorted out. I would replace and try, but the harness from the truck has no power. Both ends give me ground. I don’t know how to check if transducer if working or not. That’s another option but have to figure out how to jump it. is there anything I have to look out for? Only other possibility would be that the Sam cab has a problem. I will connect dddl software and see if it gives me anything. Some ideas? Thank you