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He should listen to whomever is right, and do it. It's really that simple.

Ah yes, very simple. Why don't you write a book listing who is right on every moral issue around, and I am sure it will be well received.

Did you ever read Plato's Euthyphro? The Euthyphro is a dialogue between Socrates and Euthyphro, set outside the court-house in Athens. Socrates is attending the court having been indicted for corrupting the young with impiety. Euthyphro is attending the court in order to indict his father for the murder of a household slave.

When Socrates hears of the reason for Euthyphro’s presence outside the court he takes heart. Surely one willing to bring charges against his own father must have certain knowledge of piety and impiety, Socrates reasons. No one, he thinks, would set out on such a course unless they were absolutely sure that it was the right thing to do. Socrates forms a plan: he requests that Euthyphro teach him as to the nature of piety, in order that he might inform the court that he has learned the error of his ways and presents no further risk to the young.

Needless to say, Euthyphro falls short.