daytime driving lights

[Swimmer]

DOT rules pertain to commercial motor vehicles being used in the furtherance of commerce and have a minimum gross vehicle weight rating of 10,000 pounds or more.

While its true in the strictess of interpretations that all lights installed must work I doubt very much unless its a tailight, turn, stop, running lamps, or a headlight, both high and low beam you wont get stopped by a trooper or a local officer, as long as we are talking about a camper or light truck and not a commercial vehicle. Even if you install aftermarket tail lights to replace the original tail lights because the originals dont work anymore you must remove the original parts/defective lights otherwise the defective originals must be made to work along with the new aftermarket installation.

And what Tajon said about touching the lights, if you have touched them thats why they are burning out or dont even work. Install with glove on or use mucho layers of paper towels.
One thing you should all know that you are not allowed to have fog lamps on unless it is an emergency, ie; headlight out/s or fog so thick you can't see the front of the truck. Many people turn them on everytime the headlights are on and it is a violation.