After market and ballast resistor question.

Here's how Mopar ignition works, for years and years.

You have "dark blue" which is hot coming from the key in "run" known also as "igniton run" or IGN1"

This feeds one side of the ballast and also feeds off to the alternator field and regulator power

But when you START the car, you need hot 12V direct to the coil.

This is supplied by a SEPARATE circuit directly off the ignition switch, brown wire, known as "ign2" which BYPASSES the ballast during cranking. If your harness doesn't make room for this, you may have to add it "back in."

Your starter relay is yet ANOTHER separate circuit directly from the key, hot only when key is in "start." This wire energizes the start relay when the other terminal on the relay is grounded by the neutral safety switch (auto) by the clutch safety switch (newer stick cars) or is permanently grounded in older stick cars

Once again, your harness outfit, designed for "ferd 'n chivvys" just might not incorporate this, and you might have to add a wire off your switch.

Refer to your original diagrams for this, what do ya have?