I too have a Honda Jazz 2007! 1.3 i-dsi
Under light electrical load, it turns the alternator off. I can feel a difference in coast distance / time.
This usually happens under light electrical load, and low fan speed. Radio hardly uses any power in the jazz, i'm quite pleased. I think it's somewhat more efficient than a normal car, infact i've slept in the car with the radio on overnight and battery was hardly discharged (used voltmeter, i think on low volume you get more drain from the interior bootlamp).
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