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 - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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