actual need for ballast resistor with electronic ignition?
Let's start in the 1960's. There is no electronic ignition from Chrysler yet. Points only, The ballast resistor reduces the voltage to the coil.
Now the factory Chrysler electronic ignition stars as standard in 1972. A 5 pin ECU and a dual ballast resistor. 1.2 ohm side for coil, 5 ohm side for ignition box.
Now in 70's direct connection (mopar perf later) sells performance electronic ignition with a 4 pin ECU amd a single ballast resistor for coil, 12 volts feeds to ECU on pin #1 from the Ignition 1 circuit. The only wire connected to the other side of the ballast resistor goes to the ignition coil. See wiring diagrams.
More reading here from mopar performance instructions. https://www.mymopar.com/downloads/elecignconv.pdf
Let's start in the 1960's. There is no electronic ignition from Chrysler yet. Points only, The ballast resistor reduces the voltage to the coil.
Now the factory Chrysler electronic ignition stars as standard in 1972. A 5 pin ECU and a dual ballast resistor. 1.2 ohm side for coil, 5 ohm side for ignition box.
Now in 70's direct connection (mopar perf later) sells performance electronic ignition with a 4 pin ECU amd a single ballast resistor for coil, 12 volts feeds to ECU on pin #1 from the Ignition 1 circuit. The only wire connected to the other side of the ballast resistor goes to the ignition coil. See wiring diagrams.
More reading here from mopar performance instructions. https://www.mymopar.com/downloads/elecignconv.pdf