2003 Int 4300 Rollback turn signal issues

Try wiggling the lever when it isn't working. I have a 98 that the turn signal switch was bad and acted very similar. I could hold the lever just right it would work. I will warn you they are pricey

 

If cycling the key seems to temporarily fix it, you likely have a short in the right turn circuit somewhere. The lights are computer controlled. There are no fuses. The lights are powered directly out of the body controller. The body controller has the ability to sense the amount of amperage draw on each circuit. When it senses too much amperage draw it will disable the circuit from working until the next key cycle. Check your right turn wiring and lights for any shorts or areas where the wiring may be rubbing the chassis. You can leave the signal lights on and wiggle the wiring while watching the lights. When they quit working you will be close to the bad spot. Hopefully it is an easy find.