Thanks for the input folks. I don't think it is the main engine earth, as I'm pretty sure the starter wouldn't crank if it was, and it does every time (and nearly always starts). After a conversation with the previous owner, I am leaning towards a wiring issue at the ignition switch, he had replaced it some time ago for a mechanical issue in the switch, and maybe one of the solder joints he deployed have come awry. Starting to get beyond my pay grade, we have an auto electrician locally who does old cars, so maybe it will be time for him. Will report back if we find anything to add to the body of knowledge.
