replace your head light switch
Probably your alternator.
I have an 2005 and the headlights on it will dim, and then brighten back to normal. I bought it brand new, and it has done it since I bought it. I actually took it back to the dealership, and asked them about it, and they said that Chevy knew that it would do that, but that the car would keep running, and that there was nothing that they could do about it. Hope this helps.
it is caused by the alternator voltage regulator switching on and off to charge the battery, this problem is encountered on many makes of car, you may not of noticed it before prior to exchanging the battery.
Alternator is failing.
On my 89 Probe it overcharged because I needed a new alternator. Sometimes a bad computer causes "spikes" in the voltage. In this case, turn the headlights on at night, if they flicker like high beams, then the computer is NG. -CE
a flat battery
The primary causes for the lights to flicker inside on a 2002 Chrysler Sebring LXI is a loose bulb or wire. This can occur when the vehicle has experienced rough road conditions and excessive vibration.
What_is_a_loud_humming_from_car_light_motor_after_in_lowers_down_and_closes_on_your_1997_firebird
I think it is a dying battery
A monitor may flicker due to a poor cable connection. Other causes include electrical noises and over-sized speakers near the monitor.
its to conserve power to start veh. with full voltage to starter headlights will come on after starting car
It has a bad seal or a crack allowing moisture to get in.