I realize there are sophisticated computer controls in today’s automobiles, so let’s keep it simple and use an old Jeep CJ as an example. The thing sometimes powers the lights, wipers, water pumps, radio and charges the battery, but once the battery is completely charged, and all those accessories are turned off, the alternator is still churning out the same output. Where does it go?
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On top of the other two answers that are ok, I must add that once the battery has been fully charged the alternator will provide the electric power required by the car systems (stereo, lights, spark plugs, and so on)
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