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

Decided to pull bulk head connectors off and inspect. Also pulled fusable link connector at firewall apart. All looks clean no signs of corrosion or connector melting ect.

New engine headlight M&H harnesses around 2009 or so. At that time bulk head was sprayed with electrical contact cleaner and packed with dielectric grease. Car driven around 5k miles since and kept in garage. Hood to cowl seal in place to keep water off firewall when washing car ect...

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