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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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