Hawaii Revised Statutes Division 1. Government § 14-27

In case of the death or absence of any elector chosen, or if the number of electors is deficient for any other reason, the vacancy or vacancies shall be filled by the alternates in the order of their numerical designation for their respective electors causing the vacancy or vacancies, and in the event that vacancy or vacancies still exist, then the electors present shall select from the members of the same political party or group as many persons as will supply the deficiency. Certificates for the alternates or substitutes as presidential electors shall be issued by the governor.