Normal cause is failed bulb.
You have a failed bulb on the right side.
Because you need a new bulb.
A right handed person has to send a signal from the right side of the brain to the left side before the signal is sent to the body. A left handed person gets the signal direcly on the left side of the brain, therby left handed person have slightly faster reflexes.
It means your turn signal bulb burnt out.
When it flashes fast it means you have a burned out bulb omn that side. Check all you lights and you'll find the one that's burned out.
bulb is burnt
If the right one works,it might be a bad bulb or a bad ground.
Replace the turn signal flasher relay.
More than likely you have a burnt out bulb at the front signal light, rear signal light, or brake light on the right side.
check the bulbs one is burned out
means there is a bulb burnt out on left side. check side marker/blinkers
most likely one of the bulbs is burned out