I looked for a stamped letter on the housing but there are none. There are 3 terminals. one of which has a decal marked with this statement "do not connect to this terminal"
The others, 1. is a screw and is in the middle of the generator, 2. towards the back of the generator is a stud connection , Both of these are in line front to back of the truck, neither is closer to the fender or engine.
I believe this generator was installed when the 1959 engine was installed, still a 235.
Sorry I didn't include this info in the initial post.
I would attach a picture but have not figured that out yet.