Not quite sure what you are saying there Gene. I can't say what the wiring actually looked like when they came out of the factory. By the time I was old enough to understand these systems, they had all been out in the field a while.
IH had several different wiring diagrams, just for the A and B, not to mention all the other models. They had starter no lights, lights no starter and both. They had diagrams for adding lights to a starter system and for adding starter to a lighting system. There was one thing common to every one I have ever seen. If there were no lights, the two F terminals were jumpered together. If there were lights, nothing was connected to the cut-out F terminal.
I have in front of me the instruction manual for starting, lighting and starting - lighting for the A, B and BN. Maunual ID: INT 5402. 5-6-41-2B. On page 17, in the section for adding lighting to a tractor with a starter, it says:
"Remove short lead connecting field "F" to field connection on control box. Connect generator field to switch cable directly to field terminal on generator frame."
It says something similar for each other section that includes lights.
It also has an illustration of the tag shipped on the generators. It shows the jumper from F to F. I suppose the originals you have found with the jumper had the lights field installed and the installer didn't read the instructions.
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