Funny this should come up, saves me a post. My buddies 73 chall factory electronic is doing the same thing.I did replace the ign switch last year and IIRC could not connect ALL the wires properly thru the banana column connectors as some well meaning "edisons" had added a FORD starter solenoid, God knows why, and done a few things outside the harness.Cranks normally, but no spark in the "cranking" position.(Makes ZERO ignition noises).I just noticed it only starts when you letta go the key.He, being a newbie, cannot remeber if it always did this or if it's a new thing. He did install a ne ballast a couple weeks ago.