If the clutch does not engage when you jump the prssure switch, use a 12 volt test light to check for power at the connector that attached to the compressor clutch. With the engine running and the connector disconnected, attach the clip on the test light to ground, and touch the probe to the wire in the connector on the power source side of the connection. If it lights, the problem is in the clutch, if it does not light, you have to trace the circuit back and find out where there is power and where there is not.
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