I have a photo of an alternator (or more precisely generator) delete on one of smoky Yunicks race cars, he dumped the standard engine mounted generator and instead mounted a small generator in front of the radiator complete with a propeller attached. There wasn't an in-car computer to run back then (the 1970s I presume), but there was the ignition system to power. Unfortunately the race scrutineers called this mod "cheating" and wouldn't allow him to run it. Obviously you won't be doing race speeds on public roads, so how effective this would be I have no idea. An existing electric thermo fan might generate some current if wired in correctly to charge the battery rather than drain it.
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