What are the qualifications to be an elector?
The U.S. Constitution contains very few provisions relating to the qualifications of electors. Article II, section 1, clause 2 provides that no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an elector. As a historical matter, the 14th Amendment provides that State officials who have engaged in insurrection or rebellion against the United States or given aid and comfort to its enemies are disqualified from serving as electors. This prohibition relates to the post-Civil War era.
https://www.archives.gov/electoral-college/electors