No brake lights of blinkers 1990 dodge dynasty

While not likely, it is possible that the light bulbs in both sides are have bad filaments. Turn on ignition key (but don't start engine). Then turn on parking lamps (first detent or "click" on headlamp switch). Walk around car and look for illumination on front parking lamps and rear tail lights. Turn on the right turn signal. Are those (right hand) lamps now changing brilliance? Try the left turn signal in the same manner. Are those (left hand) front and rear lights changing briiliance? Take note of any positions that did NOT change briliance when the turn signals were activated. If NONE changed briliance, you either have a bunch of bad bulbs (unlikely) or a bad flasher (more likely) or a bad turn signal switch (most likely) or perhaps wiring problems (possible if the car has been in a collision or has been "worked on" by some "non-expert" mechanic). Check the action of the emergency flasher control switch located on the steering column (facing up). Pushing it in (down) should result in the button going to two different heights alternately (low, high, low, high). You could just have bad flashers or corroded flasher contacts! Good luck!