You haven't said what your vehicle is , usually when this type of thing happens it is a faulty earth connection at the turn signal bulb fitting, this is easy to check , remove the bulbs and turn the turn signal on and see if the fog lights still blink, if they dont then is a problem with the earth at the bulb holder , check for the condition of the earth wire and its connection to the body, hope this helps
SOURCE: 1998 ford taurus left turn signal blinking fast
Replace the bulb that stays on and doesn't blink, if that doesn't solve the problem, let me know.
SOURCE: right read blinker/break light dont work, turn signal blinks rapidly
It's the bulb. There are two filliments in the bulb. One is for when you turn your lights on and the other is for breaking and blinker flashing. When the break filliment goes bad it causes the blinker to flash very rapidly. 100% the bulb. Change it and all will be good again. P.S. if it were a fuse none of the break lights or blinkers would work.
SOURCE: 2001 Toyota Tacoma- turn lights not working and cruise control
fuses???
Check relays.....
Harness grounds, engine ground,
Check the trailer harnes for short.
Vitally
most likely its the turn signal relay. which is under the hood. in the fuse box. also make sure ur running lights are working if they are connected to the turn signal.
SOURCE: Brake light, Turn signal not working rear right 06' Focus
I have a 2000 ford focus no brake lights. with the brake lights the transmission would not go into drive .replaced the brake light switch checked fuse replaced turn signal switch with no results then i moved onto the wiper switch and replaced it as much to my supp rise it fixed the problems
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