Aircon compressor, isn't cutting in and out.

[AUSVX]

Hey, for a couple of months now the compressor clutch hasn't been snapping in and out.
I already know it's leaking or was leaking but that shouldn't stop the clutch from attempting to pop in and out.

Can someone lead me to some places in the car where I can look with a multimeter or what not so when I fix everything up I can just tackle it all

Thanks, Jordan.