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Assuming you have power windows, ! ..The dimming of the headlights when raising or lowering the power windows, generally indicates a greater than normal electrical load is placed on the battery (high resistance), this is due to the excessive effort made by the motor in raising or lowering the window. The increased effort is (1) generally due to partial seizure of the window regulator mechanism (2) because of poor or no lubrication,or (3) tightness of the window glass in the guide. (4) Could also be poor battery. (5) worn out motor.

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Q: Why do the headlights dim when windows are rolling down?
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