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Thanks for all the responses. It sounds like it could be a weak alternator. I've also noticed that the headlights dim when turning the steering wheel any amount. Using the stereo does not seem to affect it. This is a totally stock car.. other than the new tires, battery, and ceramic brake pads...

Agree. Thanks for listing the path to follow.

I think it may be the alternator too but I find it odd that there are no problems charging the battery and that even cruising at highway speeds the alternator wouldn't put out enough to push the window motors without causing the headlights to dim. If it's the alternator, I'm going to be really...

I have a '06 5 with 40k miles on it. The headlights dim whenever I use the power windows. Is this normal for this car? My battery was getting pretty weak so I replaced it at about 30k but the dimming issue persists. This happens no matter if I'm idling or cruising down the highway. Last night we...