Thank you Dave.
Bottom line is, the ballast resistor is needed to "protect" the coil and the ECU even if a 4 pin ECU is used instead of 5 pin.
This is bone stock 1973 Charger Rallye 340CID 4 SPD. The factory system is just fine.
Not when using the Accel super coil. The resistance of the primary winding in the super coil must be ok to work without a ballast using the MP orange ECU. I have been running that setup for 5 or more years and never a problem. I actually don't remember the ohm reading on the super coil but I have one out in my garage I will check later. And that coil never got hot either as I checked it a lot. The factory system may have to have it as you stated though. Ron
