There are drawings on the web that show both IGN 1 and IGN 2. Some that show the 5 pin ECU and dual ballast resistor too if required.
And since coil ground is controlled at the ECU, the ECU must be chassis grounded, ( also not shown ). Beyond that, I read a voltage drop somewhere. IGN 1 and 2 should show closer to 12 volts. The less you put in a ballast resistor the less you get out. 5.5 is too low for it to run right, if at all.