Combine first 8 ingredients in a bowl. Add fish; toss to coat. Cover and refrigerate 15 minutes.
Wrap tortillas in foil. Place fish and tortillas on a grill rack coated with cooking spray. Grill fish, covered with grill lid, over medium-high heat (350° to 400°) 3 minutes on each side or until fish flakes easily with a fork.
Divide fish among tortillas; top with relish. Serve with lime wedges.