turn signal problem
It is remotely possible that the switch (in the steering column) is the problem but extremely unlikely. The switch would normally cause a problem where the turn signal wouldn't come on at all rather than the problem you describe. More than likely you have a corroded socket on the right side as others have suggested. Burned out bulbs and corroded sockets are a common problem that causes one side to stay on rather than flash. It is unusual for the problem to be intermittent but that is still the most likely cause.





