For those who selected the Ignition key as the fault, take a Gold Gtar out of Petty Cash. Testing had shown intermittently, no voltage at the ignition wire at the starter solenoid. But why no voltage was still a mystery. Found by pushing the key switch assembly in against the spring while turning solved the problem. As to the relation to heat, I am guessing either the current through the ignition switch was having an effect or more likely. the housing around & above the switch on the column is exposed directly to the sun and is extremly hot to touch. Either way, now need to rectify switch problem.
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