Remove ham from its packaging. Discard flavoring package if it comes with one, you don't need it.
Place ham flat-sit down in a 7+ quart crock pot/slow cooker.
Rub and press in the brown sugar all of the top and side of the ham.
Then pour the maple syrup and pineapple juice over the top of the ham.
Turn on the crock pot to low, place lid on and cook for 2-3 hour. I suggest checking the temperature at 2 hours. Once it has reached 140° F hours on low heat spoon juices over the ham, add pineapple slices or chunks from the can and cook on low for an additional 30 minutes or until ham reaches 145° F.
Remove ham from slow cooker, let it rest for 3-5 minutes then slice and serve!