I have a 2003 Chevy trailblazer EXT. All the dashboard lights will flicker at random times. I live in Chicago where it is cold. A NEW alternator and a NEW interstate battery was put in the car. This issue existed before the new alternator and battery were replaced. The Battery and Alternator tested bad by a reputable shop which is why they were replaced.
I didn't find the right solution from the Internet.
References:https://chevroletforum.com/forum/trailblazer-27/2003-trailblazer-electrical-issue-88320/Market Research Marketing Examples