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

I put new alternator and voltage regulator on car about two weeks back. Everything worked great. Then last Friday stop to get gas on way to car show and car would crank but no start. I found if I let go of key real fast let it snap back into Run position I could get lucky and car would start. But no spark in Start position but starter would turn over engine. New alternator and voltage regulator worked fine up to this point.

So did some test: with neutral safety ungrounded, put key in...

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