Reply to "Need Help. Car turns over, but will not spark!"

Hey Julian:

Thanks for advice. To date, I have checked that the dizzy is rotating. Took dizzy out today, to swap out the ignitor, so checked out the roll pin earlier. Also checked that the dizzy was rotating, just in case timing chain issue. All good.
I have checked the volts coming from the direct line from battery, it was 12:20v, that is what the relay is getting.
That said, I believe that the issue might be the trigger wire that comes from the ignition switch to the relay, that essentially switches the relay to pass the current through to the ignitor.
But I am on clear on where to start what to look for. Could it be the ignition switch itself? I ask, as the engine does turn over. So the starter is getting plenty of juice. But no spark.

Need help!!!! Need to know what other things to check that are part of the start and run circuit. Common things that crap out and the more unusual and how to isolate to solve from what is wrong, etc.

Cheers JC71