So far I have been putting the truck in gear, applying the brake and then releasing the clutch to choke it down.
I will take a look at the alternator plug and see if that turns it off. Then try the solenoid. The truck not turning off is a new problem and I don't recall changing anything electrically that would have caused it. This truck has been draining the battery since I got in 2015. My ultimate goal is to figure out what is causing that but the switch issue is fairly new.