Recently i have discovered my right turn signal (front) blinking fast as f- and then after i check, it is because the rear right signal didnt even turn on. I check the bulb, it is okay. The filament also in great shape. But it just refuse to blink. What should i do. Where i need to check next. I check the fusebox, but im not that good with fusebox. Pls help.

 

Replace the bulb anyway. Its extremely rare for an electrical failure to only affect one signal like that.

 

Replace the 2$ bulb. Filament might seems fine when you look at it, but sometimes it is not.

 

Swap the bulb that doesn't blink with the other side to see if the problem goes the other side. If it does, bad bulb. If not, I've had one of my front turn signals have a bad connection in the socket. Remove/reinsert multiple times to clean the contacts. Spray Contact Cleaner in the socket, if available.