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Old 04-28-2019, 11:21 PM   #6 (permalink)
BanksLB7Duramax
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Join Date: Apr 2006
Location: Farmington, MN
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Alternators are not as efficient at lower engine speeds. Having two allows you two recover power faster when running high-amp draw accessories like a plow, spreaders, winches, compressors, etc., basically things that are used at low engine speeds or even at idle. Since it is highly unlikely you are charging your RV batteries with your truck, having two alternators has no advantage for you.
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