70 up charging system upgrade question

Got a spark tester, I'll try later. Still got me baffled, no issues cranking with key, but nothing with 12v direct to coil +ve??
I forgot in previous reply to Dave that I do have a factory tach. I'll disconnect that to eliminate that as well.
Thanks Matt.
So it may be sparking, and the problem may not be electric supply to coil or ECU. Right?
Get a tester and you'll see.