The ignition gets power in the "run" key position from the IGN1 wire (usually blue). If the "on position" means "ACC", you shouldn't have ignition power then. Indeed, that wire doesn't even go to the engine bay in my cars (you didn't state your year, 1972?). In the key "start" position, the IGN2 wire gets power (thick brown), and not IGN1, but since you jumpered your ballast connectors together they are the same. Your problem could be in the key switch, wiring, or bulkhead connector. My guess is the key, since the only place ACC and IGN1/2 come together. Without a multimeter, you will probably never resolve it.