bad coil?

I have power to the coil via the ballast resistor....something like 7.5-8 volts.

for whatever reason I cant seem to get power to the negitive side untill I disconnect it...then it arcs to the lead to the dizzy and I have power at the negitive side. No matter what I have done I cant get power to the coil wire either.

I have used 5-coils now...3 that where on running vehicles...one was a blaster 2