Do you have anymore info on this couple at all? Did they have children or where they came from to SC? Most of my line is from PA NJ and then England Scotland and Ireland.
I did find this.
1790 United States Federal Census Name: John Carruthers County: Pendleton State: South Carolina Number of Free White Males Under 16: 2 Number of Free White Males 16 and Over: 3 Number of Free White Females: 4 Number of Household Members: 9
don't know if this is of any help. If you give me your email address I can send you info that might help.