If you actually lost the tail lites , brake lites and turn signals all at the same time I would definetly check the grounds in the rear real good because they are all on different feeds. Turn signals are a 12 volt key on feed through the flasher to the turnsignal switch and brake lites are the same bulbs as turn signals but they are a 12 volt hot all the time feed to the turn signal switch. And dash lites and tail lites are also hot all the time when the headlite switch is on as they feed through the headlite switch and then through a fuse. As said it could be more then one problem but if the front park lites did still work and all the exterior lighting trouble was in the rear lites make sure the ground for the rear lites is good. Cant tell you how many times I see dash lites go out or flicker in older muscle cars from the headlite switch rheostat trouble also. Good luck with it. Ron