I bought a brand new 2009 Pontiac G6, Automatic, 4 cylinder engine. Not long after I got it, I started noticing that when I had the car running, especially at night when the headlights were on, if I tried to put the windows up or push the brakes, the lights interior and exterior will all dim out. This also happens when the heater/AC fan is running. I took it to the dealership to have it looked at, and they told me that this was completely normal. Definitely doesn't sound normal to me. I could see if the car was not running and was sitting in the Accessory setting having this problem, because it'd be drawing the power from the battery. But, not when the car is actually running. Very frustrated.