I have been searching forums for my problem, but most fall short of what it took to fix the problem. I was installing a trailer plug yesterday and everything worked fine. Got in truck to drive it to work and no tail lights, marker lights, or dash lights. Hazard lights work. Lights and brakes lights also work fine. Checked fuses and all bulbs and all are fine. Used a test light and have pwr at the fuse block but no pwr at the tail lights. Could I have shorted out the hazard relay and caused this problem? There is also a tail light relay, but if this would have gone out I wouldn't think I would have pwer at the fuse block according to the electrical diagram I have? If anyone has had this problem I would greatly appreciate some help. Electrical frustrates me to no end. Thanks guys.