What coil..?

318willrun said

I'm curious on all this as well as electrical is not my strong suit. Two questions:

• IF you run points and a coil with a resistor in it (MSD II or Pertronix per say), do you need a ballast resistor?
• IF you have a 4 pin ECU and a coil with a resistor in it, do you need a ballast resistor?

Click to expand...

- Of course there are always exceptions to the rule.
I believe any time you run points you will need a resistor somewhere in the voltage supply to the system regardless if it is internal to the coil or mounted externally, like mounted on the firewall.
- No if a coil has an internal resistor you would not add another resistor in the system, as long as you are supplying the correct voltage for the ECU's voltage rating.
Perhaps there is another forum member who is better versed in this could chime in.