I've found a lot of help on this site in the past, but this is my first time posting a question of my own. My Trailblazer side marker lights do not come on. I don't know when they are supposed to come on, or how to make them come on. I'm talking about the vertical light in the front. It doesn't work with my turn signal, day or night, nor with my emergency flashers. I do not have the fog light switch on my dash, which I have seen on the same model at a junk yard. I thought I could try fuses, since both don't work and the bulbs appear to be good. I actually replaced one side. But the fuse box does not identify a "side marker" fuse. I've searched this forum, and the manual and I cannot figure out how to operate the vertical side marker light, nor what it is technically referred to. How do I get these lights to come on??