Hi Joe!
I got the message back from my brother. He used a Heathkit radio, not a Kraft. Sorry.
He built several Heathkits when we were younger (1960"s), one being a COLOR TV. I always admired his abilities. I do not know why you want a diagram, but he said to install a battery, locate the + and - inputs, and follow the circuitry right to the antenna, and then see if it activates a receiver on that channel. He actually used more $4.00 words but I picture a hard-wired circuit board which could be accessed for testing, or you would not even ask the question in the first place. Electronics are fun. Yesterday I re-learned that 120v AC won't kill you while you change a wall outlet!!!!!!!!
Good Luck!