You could have a bulb out or the blinker switch is bad. It should be a thermal switch located above the pedals if it's not a bulb.
You have a failed bulb on the right side.
Bad ground.
Normal cause is failed bulb.
usually this is a bulb burned out on the left side
Replace the turn signal flasher relay.
If the right one works,it might be a bad bulb or a bad ground.
Sounds like you need a new flasher.
wiring.
Probably needs a turn signal flasher
check the bulbs one is burned out
Because you need a new bulb.
If the bulbs check good, replace the flasher relay.