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The alternator proper is not drawing power away from the engine unless you use it.
So 60 watts from fans on 2 settings, 200 watts for ignition. . .those aren't big numbers but the alt is having to convert from AC to DC and its only going to keep about 75-80% there. So that 60 watts of sound or air becomes 80 watts. The real savings are to elimintate he big boys like 200-300 watts of engine draw(.5 hp).
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