S.C. Code Ann. § 33-31-721: Voting entitlement generally.

(a) Unless the articles or bylaws provide otherwise, each member is entitled to one vote on each matter voted on by the members.

(b) Unless the articles or bylaws provide otherwise, if a membership stands of record in the names of two or more persons, their acts with respect to voting have the following effect:

(1) if only one votes, the act binds all; and

(2) if more than one votes, the vote must be divided on a pro rata basis.