I went out and did the testing you and Jerry recommended last night, before I read this. Charged battery to 13.6, made sure everything was tight, with yellow and resistor wire off post and with jumper going from battery to positive on coil, it still didn’t start. Video taped that.
Also took center wire from distributor and grounded it. And read voltage at battery while cranking, it never got below 10.9, and I video taped that as well.
Ending voltage on battery after a few cranks was 12.9
I will go out and measure voltage at positive while cranking in a bit. It’s cold, can’t stay out there too long.
Jimmy Deveney ‘66 GMC 3/4 ton pick up 4 speed manual 305E V6
