brake lights 1967 pontiac lemans

there should be four wires in the trunk going for the lights. One is black (ground) one is yellow, (left t/s I thnk) green Rightt/s) and brown-tailights. the t/s wires are for brakes and turn signals. Check for a bad ground on the tailight sockets though, that was one of the problems with them. You shoul be able to getreplacement sockets at any auto part store. make sure your brake light switch is sending power out though.