Put your thumb over the suction port of the compressor, covering it completely, & turn the compressor over with a socket. If it sucks on your thumb, the compressor is probably good. You can test the field coil by putting voltage to it through a 3 amp in-line fuse. If it can go for about 5 minutes or so without blowing the fuse, the coil is probably OK.
Vintage Car Solutions
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94 164LS; 83 GTV6; 74 Spider; 67 Fiat 124 Sedan