Lights

i HAVE A 95 dODGE dAKOTA - THE TOP REAR LIGHTS DO NOT COME ON. tHE TURN SIGNALS, BRAKES AND PARKING LIGHTS AS WELL AS THE BACK-UP LIGHTS ARE OPERATING FROM THE BOTTOM SET OF LIGHTS. i HAVE CHANGED ALL THE BULBS, AND CHECKED ALL THE FUSES, THEY APPEAR TO ALL BE FUNCTIONAL. anY SUGGESTIONS? whEN i TURN THE TRUCK ON, THE TOP REAR LIGHT S DO NOT COME ON!