The original system on a B was a cut-out type system. If everything is correct and working, when the lights are on the system will be in the high charge setting. In the high charge setting, the generator field is grounded (through the light switch but none the less a direct ground). Grounding it with a jumper at the generator simply hard wires it to high charge. If the rest of the system is working, you shouldn't see a difference in the head lights. It won't hurt anything if you are running with the lights on, and probably wouldn't with them off. Monitor the battery for signs of overcharging as John T described.
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Today's Featured Article - The 9N Lives Again - by Tyler Neff. I often reminisce about the good old days of my youth when I visited my grandparents on their farm in Moorefield, West Virginia. I lived in Middletown, Maryland, which was about two and a half hrs away from the farm. During my summer vacations I would spend two weeks helping granddad Wilmer with his farming duties. Wilmer and his brother Weldon owned the �Neff� farm. Th
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