Cranks but won't start. Unplug ground at field spade on Alternator and it starts?

340sFastback said
Two week old voltage regulator resisters have burned appearance? With voltage regulator connected to Ign 1 and field wire disconnected car will start. Field wire connected and field wire now at zero ohms after wiggling alternator terminal end car won't start.

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Since you have it off, remove the cover.
I don't think this is the problem but might as well visually check the fusible wires and points.

I'll need to reread later what you posted about the high restance when moving wire.