HELP!!!

I have a 1954 Chevrolet Truck converted to 12 volts with an alternator. I must have it hooked up wrong. When I have the truck running and when I go to turn the key to the off position, it won’t shut off, and my battery is completely discharged after a while. I have a universal key switch that is probably hooked up wrong too. If anyone can help that would be great!
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1955.1 Chevy 3600 NAPCO Truck
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1957 Chevy 6400 US FOREST SERVICE
Here's a long list of all my STUFF!