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As the current draw on the alternator varies, the load it presents varies. With all lights blazing and after an engine start, the alternator would be a bigger restriction in the exhaust than with no lights on on a warm day. And then there's heat soak...
But I've thought about this too, and maybe it could work. Any such system needs to be able to cope with the car's maximum demand for electricity in a 'worst case' situation.
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