My dart wont die

There should be a wire to the ballast that you can pull to kill it, which is the power feed from the ignition switch to the ballast, coil, etc. If the car stops running when you pull this wire, then it is likely the ignition switch. Ths would be a dark blue wire to a 2 wire ballast (not at the end of the ballast with the brown wire to it). But I don't know you year of car to know if the ballast is 2 wire or 4 wire.

Is the wiring to/from the ignition switch stock/original?