In a large stockpot or other container large enough to hold the turkey and brine, combine the water, bourbon, salt, brown sugar, orange wedges (squeeze each wedge to release the juice), bay leaves, peppercorns, and cinnamon stick. Stir to dissolve the salt and sugar.
In a large pot, combine the Orange Brine Seasoning (from the Traeger Orange Brine & Turkey Rub Kit) with 1 quart of water. Bring to a boil over high heat and cook for 5 minutes. Remove the pot from the heat and add the remaining 3 quarts of water and the bourbon. Refrigerate until completely chilled.
Rinse turkey thoroughly with cold water; pat dry. Combine orange juice, water, 1/2 cup bourbon, and molasses in a 2-gallon heavy-duty ziptop plastic bag; add turkey. Seal and marinate in refrigerator 4 to 24 hours turning bag occasionally. Remove turkey from bag, reserving marinade. Preheat oven to 350 degrees. Tie ends of legs with cord.
While the turkey roasts, make the glaze. Melt the remaining butter over medium heat in a small saucepan. Add the bourbon and bring to a simmer. Stir occasionally until the glaze has reduced slightly, about 10 minutes. After 1 1/2 hours, brush the turkey with the bourbon glaze every 20 minutes.