Try this site. Just click on "Free TSB's and Wiring Diagrams" and agree to the terms. Then select "Wiring Diagrams" and enter your vehicle information. Let me know if you need additional help. Good luck!
http://www.wilsonautoelectric.com/index.html
RepairPal Certified shops can diagnose and repair your 1993 Ford Thunderbird. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.