Why would one side of a vehicle have properly working turn signals but when you go to take a right turn they only stay steady on instead of blinking with all brand new bulbs even?
Try sanding the metal contacts for the lights in the socket and a
little on the bulb if its an older bulb. Odixation and general crap
can increase the resistance and drop the current flow. The flasher
isn't triggered and the side stays steady on.
could be the flasher