Spray the slow cooker with cooking spray. Or use a crockpot liner for easy cleanup.
Add the smokies to the slow cooker.
In a separate mixing bowl, combine the grape jelly and chili sauce until they form a smooth mixture. Pour it over the sausages.
Stir the smokies and sauce to ensure they are evenly coated.
Cover the slow cooker with its lid and cook on low heat for 4-5 hours or 2-3 hours on high.
Stir the smokies and sauce again before serving.
