What Causes One Side Turn Signal Not Working?

[LaJackson]

Possible reasons for one side turn signal not working include short circuit, flasher relay failure, excessive contact gap, etc. Here are the details: Short Circuit: First, check if there is power at the hot wire terminal of the flasher relay. If there is no power, check for an open circuit between the wire and the power source. If there is power, use a screwdriver to connect the two terminals of the flasher relay. If the turn signal lights up, it indicates a faulty flasher relay that should be replaced promptly. If it doesn't light up, check the flasher relay. Flasher Relay Failure: Open the flasher relay cover and inspect whether the coil and resistor are intact. If the resistor heats up but the contacts fail to close, press the movable contact. If the turn signal lights up, it indicates a faulty relay. Adjust the contact gap if it is too large. Excessive Contact Gap: If the turn signal doesn't light up when pressing the movable contact or when the contacts are closed, use a screwdriver to short-circuit the contacts. If the light turns on, it indicates oxidized contacts. If the turn signal still doesn't light up, the turn signal switch may be faulty. Use a screwdriver to connect the hot wire of the turn signal switch to the left and right light wire terminals separately. If the light turns on, it indicates a faulty turn signal switch that should be removed for repair or replacement.