I am restoring one of these for a relative and when I opened the headstock some of the wiring came off. I immediately plugged them in where it "looked like" they should go, but I want to make sure I had it right. I could not find any wiring diagrams on the reference post.
The photo in the link you posted resolved it for me, the wires that came off were the green and white ones that have a plug in the "middle" of the wire.
I was pretty sure I had it right, but why plug it in and have it melt down when you can check first?