From what I understand, they generally do not cycle, but they will engage and disengage based on the opening and closing of the pressure switch.

Yes, if you are not getting 12 volts at the compressor, then the problem lies somewhere up the line. Also check your grounding cable. Poor grounding will cause all sorts of issues.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K