I have a 2006 Fleetwood Timberlake being towed by a 2008 Hyundai SantaFe. When the camper is connected to the tow vehicle the left brake/turn signal does not work. All the running lights work and the right brake/turn signal works. The 4-pin wiring adapter has been replaced on the camper and the one on the tow vehicle is brand new. Previously none of the brake and turn signals were working. I replaced the bulbs with LED ones and now the right brake/turn signal is working.