No tail lights!!!

[themargaritaman]

Can anybody help me? I'm not a dummy when it comes to mechanics. I am having an issue with my brake lights/parking lights. During the day, when I am not using my parking lights my brake lights work. At night when I turn on my headlights and or parking lights, I have no tail lights and when I brake, my rear parking lights light up as well as my brake lights. Weird huh?? I have checked all wiring and have no shorts or exposed wiring anywhere. All the wiring in my truck has been replaced. They use to work fine before, but it has sat for 2 years and now this. Does the stop lamp switch correct this?? Everthing is hooked up correctly, and the bulbs are new! Any help would be greatly appreciated. And yes all fuses are fine and the correct size.