70 Duster runs rough or dies when up to operating temps
you have 7 volts to the coil, I would say you got the ballast wired correctly. I have seen that at higher RPM the voltage to the coil increases but I'm not sure it ever reaches 12V
- Your 12V source to the orange box comes from the correct cir? 12 V in Run / Start not after the ballast resister?
- Orange box is well grounded?
- Do you have another to swap in to see if that is the issue?
- The reluctor gap is correct?
- the carb is adjusted correctly?
- the choke is opening when at temp?
- there have been reports of distributer wires from the pickup being reversed and making a difference ( I still don't know how that works) but you could get 2 trailer light pigtails and make a polarity switched connector
OR it might be as simple as you need to tune it to idle when hot rather than cold. Choke will take care of that for you.