Scrub the sweet potatoes, trim. Scrub baking polatoes, quarter. Peel carrots and slice diagonally in 2" lengths. Place vegetables on the bottom of the crockpot, place ham on top and pour ginger ale over all. Cover and cook on Low for about 9 hours, or until veggies are tender. Mix about 2 tablespoons of liquid from the pot with the glaze ingredients in a buttered measuring cup and pour over ham. Comtinue cooking on Low for 1 or 2 hours, basting often. Slice ham in thin slices, serve with vegetables.