Why do my turn signals stop flashing when I apply the brake?
Why do my turn signals stop flashing when I apply the brake? Make sure you have the right bulbs in and check the wiring harness on your lights and take a look inside the light assembly for any short circuit. Also any addition like the third brake light and, like mayer said, a trailer light plug that is shortened can do it too. Good Luck to you Was this answer helpful? When do you need to replace a turn signal Flasher? The good news is that all of these symptoms point to two possible issues, a bad turn signal relay...