2007 Ford Fusion AC

AC clutch wont engage. Took the car to the shop and they said we need to replace the compressor. Did that and clutch still wont kick on. We are getting power to the relay but no power at the harness on the compressor. Ran power to the old compressor and you can hear it engage. New compressor wont take and refrigerant because the clutch wont engage. My thought was the evap temp sensor but we had it tested and it pulled no codes for any sensors. Im at a loss here and out 400 bucks because the shop was wrong. Please help.