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Will aftermarket underdrive pulleys (power pulleys) affect the output of the alternator?

April 26, 2017affect aftermarket alternator output power pulleys underdrive

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Will aftermarket underdrive pulleys (power pulleys) affect the output of the alternator?

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YES, especially when using a one-wire alternator. Changing the pulley ratio of the alternator by slowing it down will generally keep the one wire regulator from cutting on . This may also produce a low voltage problem at engine idle speed, depending on the amount of reduction. Powermaster alternators are tested with a 3:1 pulley ratio in mind. This is the recommended street pulley ratio, and the ratio used in most OE applications.