How do fix signal lights?

To fix signal lights, first, check the bulbs to see if any are burned out and replace them as needed. Next, inspect the wiring and connections for any signs of damage or corrosion and repair or replace as necessary. If the signal lights are still not functioning, test the signal relay and the fuse associated with the lights, replacing them if they are faulty. Finally, consult the vehicle's manual for specific troubleshooting steps or seek professional assistance if issues persist.