hi scotty just bought a 93 Lincoln Mark VIII collapse suspension. Could hear compressor for air suspension running for what I think is its time intervol before it timed out. It did this repeatedly for several times. After I jacking it up all 4 tires off the ground, now compressor won't run at all. Is there a sensor that shuts this off? Also did not shut off the switch that is in the trunk that controls the compressor.

those systems are rather complex. But of course test the obvious things first like direct wiring and grounding of the pump to see if it's bad. You really need a wiring diagram is it's more in dept of a problem, so get one