The flasher relay is defective. Replace it.
When both of the turn signals (indicators) of a car blink simultaneously, it is usually because the hazard lights are turned on.
If both your left and right trailer signals blink at the same time there is something wrong with your wiring harness.
one of the lights is not working
you need to replace the turn signil fuse
One of the bulbs is burned out. Turn on the blinker and look at the front and back turn signals to find out which one.
Yuo may have a faulty relay, or one or more bulbs are blown.
check all your bulbs and fuses
The emergency flashers and the signal lights are separate systems. Each has it's own fuse, switch and flasher relay. If your turn signals light up but don't blink I would blame the signal flasher relay.
I replace my flasher fuse.Now they light up but won't blink.
There's a turn signal or running light out on that side, either front or rear. Turn on signal, get out and look. If both turn signals are working, chances are its the running light.
AnswerReplace the Flasher Relay. did you look at your bulbs
Bad ground