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I'd like to put an alternator cut-out switch on my 32 horse Kubota diesel that will disengage the alternator (electrically--it has a one wire alternator) at full throttle. Will this improve fuel economy? I think yes, 'cause I'm giving my car a removable roof this summer, which will add a bit of weight, and according to my back-of-envelope calcs this alternator mod could give me a (worst case) extra half horsepower at full throttle which means I won't need any engine mods to keep my present (limited) performance. Does this make sense to anybody?
Also, should I do this with a relay? Probably so (rather than have long current-carrying wires 'twixt alternator, foot switch, and battery), and hooked up as NC; so how much will the current draw for a relay negate the alternator disconnect advantage?
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