Ram Gen 3 A/C problem

I bought a wrecked 05 dodge 2500 CTD that I just drove for the first time yesterday. The A/C blew nice cold air for about 15 minutes and now the compressor will not engage. I checked the fuse block and the fuse and relay are ok. I can't find the low side pressure switch to check it. Any ideas? It seemed to cool to good for the freon to be low. I followed the lines and didn't find any leak either.

after checking closer, the #16 fuse was blown. I replaced it and just as soon as I turned the a/c back on it blows thew fuse again. Any ideas now?

did more checking and the clutch coil must be shorted out. Anyone know what kind of a job that is to replace?

replaced clutch coil...works fine now