Symptom: When activated by the turn signal combo switch, turn signal goes on for about 5-10 seconds, and then turns itself off. Turn signal combo switch remains in the on position, but the turn signal stops. The symptom is sporadic: sometimes it works correctly, sometimes it does not; sometimes the symptom is only in one turn direction, sometimes both.
Research: Research indicates that it is most likely a faulty turn signal flasher or the signal combo switch itself.
Question: Besides replacing one and seeing if it fixes the problem, is there a way to determine which part needs to be replaced?