this may have been metioned way back on the thread,,but what about the ingnition switch,,,not the keyed part but the switch that bolts on the backside of it. There's like 5 Big wire going into it. I had a worn/bent terminal inside the switch that gave me some wierd behaviors. It's been awhile and I'm getting oldtimers so I don't recall details tonite. If that fat black with a white tracer had a break in it your starter would still turn over-(black/yellow wire)-, and -blue/white- wire would feed acces. but ign. system wouldn,t get juice.
Sorry if this was covered already.