that happens with every car i have ever owned, i think its normal. cause the alternator is putting more load on the motor the engine revs up a little to keep the rpms where they should be. mine drops big time when the windows are already down and you push the both buttons down at once. when you push the button up or down when the window is already in the up or down position it is still drawing power, actually more, because the window motor is struggling to push or pull the window up or down
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