Turn Signal Switch / Brake light

Since the rear tail-lites work, that means those are good, and Probably installed correctly (but may not be) and the ground is ok.
Then, prove the fuses, then
prove the bulbs are 1157s, have clean contacts and are properly indexed, then
prove the brake switch,
then pull the steering wheel and check the signal switch. I have seen it where the signal/brake contacts have melted into the nylon switch so deep, that the wiper couldn't reach them anymore. My repair was to glob some solder on them, dress them flat, and slam it all back together.