The York compressors mounted on 115 and diesel motors were mounted in rubber. You undoubtably have a bad ground. Run a separate HEAVY ground wire from the compressor body to the intake manifold.
To verify the circuit electrically, an amp meter should show 2-4amps, with less than .1v drop at both the positive and negative connections (the negative connection on a york clutch coil is its mounting bolts). If I am right about the ground problem, there will be significant voltage (voltage drop) between the body of the compressor and any real ground.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician