I have purchased the Prodigy trailer brake controller, and wire harness to plug right into the Expedition. What else do I need to do to get it finished and ready for towing? I need to install fuse in fuse box? What else to get it going properly?

 

If it has the towing package from the facotry, I believe the relays are already populated. I can't think of anything else you might need if you have the OEM package.