By necessity the regulator must sense the battery voltage and notice when it is below a certain threshold. When this occurs, the regulator calls for the generator (or alternator) to "give it some juice" and the output will be only limited by the regulator cutout. When that happens the ammeter goes to the full charging amperage. Now the regulator senses that the battery voltage is too high so it cuts the generator off and the needle of the ammeter returns through zero and as soon as the regulator senses the voltage to have dropped below the threshold it calls for the generator to give it some more juice and the cycle repeats. An ammeter that has dampening will respond more slowly so you don't see the fluctuation.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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