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Air-Conditioning clutch not engaging

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I'm currently the proud owner of a '88 Nova/Corolla. My question to the viewing public is this: why would my A/C clutch not be engaging when I hit the A/C control. I looked at the wiring diagram, and it looks as though the clutch is in a circuit along with the A/C fan motor. Neither is coming on. I did however see somthing about a high pressure switch in the circuit for the fan, perhaps meaning that the A/C must be operating for the fan to engage? Just a thought as to why the fan might not be coming on like i expected. Can i just jump a 12v wire to my compressor clutch and see if that starts it rolling, or will I kill somthing.