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 Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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