Wrap ham in aluminum foil, and place in a lightly greased 13- x 9-inch pan; bake at 300° for 2 hours.
Remove ham from oven, and unwrap. Remove skin and excess fat from ham. Score fat on ham in a diamond pattern.
Stir together marmalade and remaining ingredients in small bowl. Spoon glaze over ham, and bake 1 hour, basting every 15 minutes or until a meat thermometer inserted into the thickest portion registers 140°. Let stand 15 minutes before slicing.