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Alternator charging the battery is most likely what's going on. I notice mine makes this noise whenever I leave the doors open/radio on/lights on and drain the battery slightly while working on it. Did you by chance do this while installing your headlights? In my case it happens occasionally and goes away after a period of driving. It takes longer than you might think to fully top-off your battery!

If it doesn't go away you can always take it to a battery shop and they can hook up to it and tell you if your alt is working properly.
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