Quote:

....it looks like I need to attach the red wire to the ignition switch side of the ballast resistor. I guess I don't understand how to do that.



That is exactly what the little terminal I mentioned does, sure you add a second wire to the ballast, yet no other mods are required.
I've done this several times, and unless you are doing a show car who cares about a second wire that is easily hidden?
Hook that thing up in about 2 minutes. Terminal is at any auto parts store.