364 lumber loader

I have an old 364 lumber loader. Could someone tell me how to hook it up. I know how to hook up the unloader track but not the loader itself. It has a 364C switch and the back of the loader has 3 wire hook ups a, b, & c.

“A” and “C” go to any pair of transformer terminals furnishing between 12 and 14 volts. Post “B” is connected through the 364c controller to the same terminal as post “C.”