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My idea for an alternator modification is to replace the shaft pulley with an Air Con-type clutch/pulley. With a circuit sensing batter voltage, while the voltage is adequate, the clutch would allow the pulley on the alternator to spin freely. When the voltage reaches a pre-determined low, the clutch would kick in, turn the alternator and recharge the battery. You'd only spin the alternator when you needed to on long trips, and could top the battery at home via a trickle charger between trips.
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