98 Silverado AC problem (clutch/wiring)

My AC worked fine as of a few days ago, however it stopped working, I don't know exactly when or what may have caused it to stop working but I have a feeling it might have something to do with the clutch and it does not engage when the AC is on as it used to.

History:

Playing with the wires/circuitry in the past had resolved the problem in the past but doing that now does not work.

I'm not a dumb person when it comes to mechanical repairs, I do have a Haynes manual but I'm just ignorant on where to start and what place would offer me the best parts (should I need to replace anything) to purchase.

Appreciate any help, it's still getting up in the 100's here in Yuma so I'd appreciate any and all advice.