66 Dart electronic ignition issues

Ok,

ballast resistor checks out just fine, as does the voltage regulator. Keyed battery sources all check out correctly. I have a new ECU showing up tomorrow. If that does not take care of the problem, I will check the reluctor. I will also run ground wires to the battery from both boxes. What gauge wire would you recommend, 12 or 14?

Whoever did the conversion, used all the factory parts from whatever car they got the engine from, and did a very sanitary conversion.

Oh, and THANKS a BUNCH for the help.

Sam