Use a 6-7 quart slow cooker. Unwrap the ham and discard flavor packet. Place the ham into the slow cooker stoneware, flat-side down. Rub brown sugar on all sides. Pour on maple syrup and pineapple juice.
Cover and cook on low for 4-5 hours. An hour before serving, baste ham with the collected juices from the bottom of the slow cooker.
When cooking is done, remove carefully and let it rest on a cutting board for 10 minutes before carving.
Notes
Slow Cooker: if you think your slow cooker may cook on the hot side, reduce the cooking time as needed.