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You are correct about it firing from the solenoid when cranking. It does this off the second small wire on the posts. The no run afterward means you are losing power on the resistance wire from the ignition switch out to the coil. On mine the resistanse wire is connected to the ignition switch and is probable about 10 inches long and breaks to regular wire out to the coil. Mine gave up at a bullet connector that someone added right after the wire. Best choices here are the ignition switch is bad, connecter at the reistance wire has given up or a gang plug connector at the firewall. Take a test light and chase it from the ignition switch out and you will find this a simple problem by elimination. I should have asked though, is it points or a pertronics system? You may still have a connection to the coil but if the voltage drop is too high neither system likes that. Even a mildly shorted coil may fire with solenoid bypass voltage and drop out when lowered across the resistance wire. If points too close of a gap may get a screwed up saturation time with lower voltage.
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