Dube

I'm trying to get my 73 Charger on the road. I've had an issue with the ignition backfeed where you can't shut it off with the key. I was told a diod needs to be installed off the alternator . I just want specifics to hook it up correctly . Please inform me again. Thank you. I'm in my garage now. My computer is at work in Silvis, I'm at home in Cordova. I'll have to answer it in the morning when I get to work.