Since your running a keyed ignition switch. Your problem is probably in your ignition switch itself. If it was in a Ford, it might be in the switch on the steering column. Whats suppose to be happening is that your ignition allows more volts to the coil at startup. Then once you release your key it goes into restricting the volts to the coil at 8 or 9 volts. Right now your ignition is not sending any power at start up to the coil. Let me know what you find.
good luck,