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

Swinger 340 said

Just a thought. Years ago, my Dodge van would start, then when I released the key, the motor would stop. Ballast was the fix.

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This is a no start when cranking so its a different problem then what you had. I wish it was an easy common problem like you had with your van.