convert to a four prong ballast

[noschevys]

I have a 4 pin ecu with a stock coil and 2 prong ballast.  For judging reasons, I need to convert to the original style 4 prong ballast.  How does this get wired?    My wiring harness as two wires going into each side of the ballast with one connector on each.  Do I need a different harness or can this be taken apart, and what about the connector for the 4 prong ballast, what does that look like originally?  The car will be only driven on and off the trailer and to the judging area.

[dodj]

If you are doing it for judging reasons, your car must have had the dual resistor setup originally, so separate the wires and re-terminate according to wire colour. Here is a pic of my plug but it may not be the correct colour for judging.
 

[Chryco Psycho]

not quite sure qhat you are after , the 72 & newer cars had electronic ign , the blue wire is 12v feed to the resistor & is jumpered at one end of the ballast to feed both sides of the ballast , the other end haas the brown wire to feed the coil & the green with red trace wire to feed the ECU , which of course does nothing as you have the 4 pin ECU not the 5 pin type , the new ECU has the resistor built inside of the ECU on the 4 pin type . IF your harness has 1 plug for each end of the ballast with 2 connectors in each pkug than all you have to do is plug in the 4 pin ballast