The lightbulb test won't help on the pulse lines. From reading the service manual that line should be about 12V in standby though - so check you have that. When sparking, each line will pulse low for a very short time then back to high. Only an oscilloscope or other fast detect device would pick up the short low pulse.

The ignition diagnostic steps in the service manual are pretty thorough and not complicated to follow, you should try that if you have not yet.

I'm going to be in Greenville SC early May, looks like 1.5 hour drive? If you're still stuck I'd come by for an evening. PM me.

Ha that is timing for you, I was typing mine and yours arrived 1st.