Hello, this is my first post here so I apologize if it’s in the wrong place or been asked before. I have a 2004 infinity g35 coupe, bone stock. Everything is good except for the left turn signal, which only works when the running lights are on. They are aftermarket headlights but I’m not sure what brand/kind. I’ve already replaced the bulb to no avail. Electronics/wiring is very much not my forte so I am just looking for any advice regarding this. Thanks!

 

Probably a failing aftermarket headlight, but you should take the car in for a diagnostic to someone who can read electronic schematics and diagnose the issue so you aren't just throwing parts at the car hoping something will work.