According to theS.C. Election Commission, you can vote even if you have been convicted of a felony. But there are a few caveats.
You must have served your time and not be on probation or parole. Your rights are not automatically restored; you have to reapply for voter registration. In most S.C. counties you must provide written proof that you’ve completed your entire sentence.
People convicted of misdemeanors can vote anytime, as long as they are not in jail on Election Day.