[trsomian]

Unlikely to be a compressor fault after all these years. I suspect a poor connection somewhere; check that the connections on the compressor are good and elsewhere in your new starting system. Electrically all there is in those motors is two windings, and they are in a sealed environment, so unless a winding has been cooked by excess current, failure is not very likely. If a winding had been poorly wound, I think it is likely to have failed before now; that unit is nearly 60 years old. I suppose the compressor itself must wear out eventually, I don't know what sort of device is in there.