If the turn signal no longer turns off automatically, there is probably a broken part inside the steering wheel for the turn signal switch. Part of the mechanism could have broken off and gotten jammed in the path of the lever.

Turn signal indicators are lights. The flash to tell you, or indicate, that a turn signal is on, and which way the lights are flashing.

are you asking about the turn signal bulbs , the turn signal switch or turn signal flasher ?

Your turn signal probably is not flashing because the turn signal lightbulb is burnt out. You could also have a loose wire on the turn signal.

Remove the turn signal retaining screws. Remove the wiring harness. The turn signal will come off. Reverse the process to install the new turn signal.