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Don't forget the brake light when you stop at night. The brighter elements draw more current. With high beams & brake lights on, there is a pretty taxing current draw going on. The 3rd brush was made to be easily adjustable so a person could increase output when they were going on an extended night time drive then lower it back down for mostly day time driving.
If you have an original ammeter your good to go. If you have one of the reproductions then be wary that it may not be all that accurate a unit.