After my car has been started and is running for a few min, there's a bit of a power drain when turning on the headlights or rolling down windows. Also when turning on the interior heater, my rmp's dip slightly. After about 5-10 seconds my rpm's go back to normal. After all this, when I try to roll my power windows down, my headlights dim as I'm rolling it down. I'm just wondering what might be causing this, aside from my alternator. This is only while idling. This does not happen while vehicle is in motion.