Check the relay.
Turn signals work off of a flasher. Replace the flasher they are usually cheap. If that does not fix it check the signal switch. That is the thing that you use to turn on the turn signals. That is usually the problem.
Generally, the tail "light" and the tail light "blinker" are two different bulbs. Check the blinker bulb first. If it is OK, then it is likely a fuse to a flasher unit.
1 fuse for all turn signals-try replacing bulb
replace the rear bulb if one side is out, if you had a bad fuse none of your turn signals would work.
How do you get the fuse to slip out of the fuse box for a 1985 Chevy club wagon
Your light has gone out or a bad fuse
your blinker will turn on but not blink if a bulb has gone bad on that side or if your relay or fuse has gone bad
need to replace blinker bulb
If the right blinker is blinking really fast, it means that there is a turn signal bulb on the right side that is burned out. (coulod be either front or rear)
cheack the wireing
First check the fuse, or you may have a burnt out bulb
A light bulb or a fuse.
Try adjusting the dimmer on the control for the dash light. If ti were a fuse, you would have no lights and that would never be a bulb issue. How's your alternator??