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I set the third brush on my 1934 generator, also equipped with a Fun Projects regulator, to the letter of their instructions. I have a good battery (6-volt) re-built generator, and a very accurate ammeter also from Fun Projects. After starting the engine, the generator will put out about 6-7 amps as it is replacing the battery starting charge. After about 5 minutes the charge is replaced and the generator charging rate decreases to a steady 2 amps. If I turn on the headlights, the regulator allows the charge rate to go up accordingly so the generator is still putting back about 2 amps +/-. This charge rate should never cause a problem for the generator or battery.