Turn signal lights stop working. Neither the right or left turn signal work. Heard a noise before it stop working. The flashing started slowing down and stop blinking. Now it doesn't work at all. What

Look for a bad ground on the circuits. If you dont have a good ground the circuit will back feed looking for a ground. Try it.

hi,

Id go right for the trailer lights plug and inspect that wiring that goes there. sounds like a part you installed may have been installed upside down , go to youtube and type the name of your truck and light circuit board and study there.

Do you have a burned out bulb, that will affect the speed of the flash

was the correct bulb used? this sounds like a single function bulb was used NOT the bulb that will light with the headlights and ALso produce turn singles

ck your turn signal switch wiring connector because it is more than likely has been hot and melted some connections.

Find the security system and write down the make and model. Use internet to find owner's manual, or how to disable the system.

did you check the directional switch. sounds like you have a bad one

make sure all the turn lights are working on your car. sometimes this is an indication of a burnt out bulb. you likely need to replace the flasher relay under the dash. if you have trouble locating it. turn on the turn signal that works and listen for it. once you know where the general location is put your finger on it and if it's clicking you have found the right relay.

You say it's the right turn signal that is malfunctioning. If the left works correctly, then the problem is most likely NOT the flasher unit. That unit provides the flash for both left and right signals. I think that flasher unit is mounted on your steering column, down under the dash. It will probably be an aluminum cylinder, but may be a rectangular black plastic block. Before you change the flasher unit, I'd suggest checking the front and rear turn signal light bulbs. On the front, those are the parking light bulbs, and on the rear are the stop light bulbs. You may have a poor connection, probably from corrosion, or the bulb is very nearly burned out completely. Good luck.