S.C. Code Ann. § 7-1-50

In case of a contest of the election of Governor, if the General Assembly by concurrent resolution shall entertain the same, the Senate and House of Representatives shall, each separately, proceed to hear and determine the facts in the case, so far as they deem necessary, and decide thereon who is entitled to be declared elected. If the two branches of the General Assembly come to the same decision, they shall, by concurrent resolution, declare who is duly elected and entitled to enter upon and exercise the office of Governor; and such person thereupon shall, upon taking the oath prescribed in the Constitution, be inducted into office. If the two branches of the General Assembly do not come to the same decision, then an election shall be called by the Governor, to take place in not less than sixty nor more than ninety days, at which the qualified electors shall proceed to vote for a suitable person to fill the office of Governor.