Belts are more efficient when they are going over larger, not smaller pulleys, under drive pulleys were made popular in racing, where the engine is running close to red line.
My understanding is that a slower turning alternator is going to be putting out less power so it is more or less going to be maxed out more of the time, so I would like to know if people who have under drive pulleys need to replace their alternator more often, because that would be an issue I would keep an eye on.
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