A 51 H didn't have a four position switch which I think you have some what clarified yourself. So, therefore if you do indeed have a voltage regulator, the field wire from generator will be hooked to field terminal of regulator where as if you were using the four position switch the field would be hooked to the light switch for high and low charge. Then your cover on on box would need to have a good ground but when you have a regulator it is not in the circuit. You can tell if generator is capable of charging by grounding the field wire at generator, if it charges then the problem is with the regulator or wiring. Just make sure your arm terminal of generator is hooked to arm term of gen and battery terminal of regulator is hooked to ammeter. If hooked properly the ammeter will show discharge when engine is not running and you turn on the lights. If not, you need to recheck your wiring.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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