Since the compressor clutch problem is intermittent, the first troubleshooting step is to connect manifold gauges and confirm the refrigerant charge. When it is low, the low pressure switch interrupts the clutch circuit. If it is low, this will keep you from chasing your tail tracing the circuitry.

Also, as you have probably learned in your wiring, the speed sensor trips out the clutch in the event of clutch or belt slipping.