easy....you have a low beam headlight burned out. Take a trip to your local parts store and they will fix you up.
It's all to do with how light works. When we are on land, light will be travelling in a straight line, and the light photons will beam straight into our eye. We can focus this light and see properly. However, if beams of light will hit another object (discluding gases, or everything would be blurry) it will be refracted (or bent, but scientists say refract because it sounds more scientific). So, when we are in water, the beams of light will refract as it hits the water, so the beams of light will not directly hit our eye, and objects underwater will therefore appear blurry.
Headlights have two filaments; one for low beams and one for high beams. There is a good chance that the low beams are burnt out. This doesn't necessarily mean that the high beams won't work. However, it's not too common for both low beams to burn out at the same time. Of course, it could be a fluke. I would replace the headlights with new ones and then go from there.
Your computer brain in your truck is messing up take it to a mechanic is my advice. Not sure I even understand what you are asking,but, If its what I think , its just a matter of turning on your lights. For some reason Chevy thought it would be a good idea to have just your low beams and the high beam dash light come on automatically when it got dark, don't ask me why. If this is not it rephrase you question and be more presice.
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