Possible causes are short circuit, flash relay failure, excessive contact gap and other factors.
Open the flasher relay cover and check if the coil and resistor are intact. If the resistance heats up and the contacts cannot be closed, press the moving contact. If the flasher lights up at this time, it indicates that the relay is faulty. If the contact gap is too large, it must be adjusted.
If the indicator does not light up when the moving contact is pressed and the contact is closed, you can use a screwdriver to short the contacts. If the light turns on at this time, it means. that the contacts are oxidized. If the turn signal does not come on, the steering switch may be defective. Use a screwdriver to connect the steering switch live wires and the left and right light wire terminals, respectively. Ifthe light is on, it means that the direction switch is defective and needs to be removed for repair or replacement.