Mine does this too, i never thought it to be a problem, but maybe check the water in your battery? Might be low. I just figured that the headlights would cause that much of a drain on the car when you flick them on. My guage also moves when my headlights are on and i am using my blinkers.
volt meter reading drop
My volt meter drops from 14 to 12 when I turn on headlights.Alternator checked out fine. Any ideas.
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