In plastic bag combine wine, thyme, oil, garlic, salt and pepper. Add steak and turn to coat. Seal bag and marinate in refrigerator for 8-24 hours, turning steak occasionally to coat with marinade.
Prepare and heat gril. Place steak on greased grill over hot coals; brush with marinade to coat. Cover grill and cook steak for 7 to 8 minutes per side or until medium. Remove from grill, cover, and let stand for 5 minutes before carving.