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Yes, and it also has an affect on gas mileage.SolsticeDesire said:Just because a car doesn't have an alternator per say it doesn't mean that the motors in the cars aren't used as an alternator. I believe that the amount of power that an alternator generates can vary. I know that in my Saturn when I turn on the headlights the engine revs a little higher. To me this would mean that the car is demanding more electricity, so the alternator must supply it and therefore the engine must work harder.