Mucho goodo. Now you know that if the starter solenoid sticks in the closed position it will cause the starter to run continuously even while the engine itself is running. And even turning the ignition key “OFF” will not stop the engine or cranking because the stuck solenoid is feeding the ignition circuit via the white wire off the solenoid (which was originally used to bypass the ballast resistor). If you happen to be running an MSD ignition, which does not use a ballast resistor, the white wire connection to the starter solenoid is not necessary (and only presents a problem if the solenoid sticks). You can disconnect it. If your solenoid ever sticks you'll think back and say
"dang that patrickt is a wonderful guy."