Need input from the brain trust; fuel or ignition redux

I posted some info in this thread................

Diagnosing Distributor - No Spark Chase
Also, what's giving me concern about just upgrading to the electronic distributor now is that the ECU has two extra wires. The black one is self explanatory (- terminal on the coil), but the blue wire needs to hook to the ignition run side of the ballast resistor. Am I safe to assume that's the side with the blue wires already on the ballast, and what can I do to test for that?