How are the Exterior lights controlled(running boards and cargo box)?

What is your question?

When new the exterior lights on my 2004 Ford F-250 Super Duty pickup(running boards and cargo box) shut off after a few seconds. Now they stay on for up to an hour after shutting down the truck. How do I Fix that? Where do I find the associated timer? What seems to make the problem better or worse? It's always there How long have you had this problem? A couple of months