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From a VAC Manual: GENERATOR Hope it Helps! The generator used on “VA” Series engines is belt driven, adjustable third brush type having a maximum cold output of approximately 12 amps. The charging rate is adjusted by shifting the position of the third brush, which can be reached by removing the cover band on the rear end of the generator. The movable third brush is on top and a little toward the engine. Moving the third brush in the same direction as the rotation of the armature increases the rate of charge, while movement opposite the armature rotation reduces the rate. A rate of charge of over 15 amps will tend to overheat the generator. The amperage output of the generator can be controlled and regulated by the light switch which is mounted on the instrument panel. The switch has three positions. The first position, that is with the switch button in as far as possible, connects a resistance in the field circuit of the generator which reduces the generator output to 3 amperes but does not turn on the lights. The second position shorts out the resistance, giving the full output of the generator, but does not turn on the lights. The third position turns on the lights, and also shorts out the resistance, giving full output of the generator. Whenever the generator is operated without the battery connected in the circuit, the field lead should be disconnected. Failure to do this will cause the generator to burn out.
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