1994 Ford F-150 AC compressor won't run

I have a 1994 Ford F-150 4x4 step side. The AC does not work. Figured it needed a charge of R-134, but in order to add you need to get the compressor to run. First thought was to jump the wires at the sensor located on the dryer, which I had been told was the right place to do so. Still no compressor. I then hotwired the compressor right to the battery and the clutch engaged as it should. I then started the truck and engaged the compressor to see if the R-134 did indeed need to be charged, the air produced by the system was cold, so I have concluded I do not need to add any R-134.

The major question at this point is why the compressor won’t engage as it should. I check the fuse and there is power at the fuse when the compressor should be on. I check this with a meter. My question is where to look next? Do these dash switches go bad? If so how to I verify? Is the fuse under the dash before or after the switch in the circuit? If before, the switch is probably working. If not it could be the switch. A wiring diagram would be helpful, any ideas where to get one that would include the AC system? Haynes doesn’t as far as I can see.

In general any ideas on where to go next?

Thanks,
saurd