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How does the drag of the clutch compare to the drag of the alternator when the field windings are turned off? there is a reason that it's worth removing the belt from your A/C if it doesn't work or you don't use it ever.
I haven't seen an alternator with a fan on it for years, so if your field windings are turned off then the only drag on the alternator are the carbon brushes, the bearings and the rotor, adding a clutch you will be adding another set of bearings, more rotating weight and more air drag.
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