TV might be the problem, not the TT
So after my husband spent a few hours with the TT following the wiring from the tongue back to the unit and admittedly learning a great deal about the underside of our unit he threw up his hands on Saturday with "I give up". Today I took our truck, the TV ( '04 F150 Lariat ) to a friend whose dad hooked our TV to their horse trailer and another unit....same symptom. Had connections to all lights except the running/parking lights. He spent a few hours trying to discover where the issue is, showed me some diagrams and advised taking it to the Ford dealer. I drove it there and scheduled the truck wiring issue to be addressed on Friday. The perplexing thing for me is that I pulled a 17 ft 2H BP slant load with a dressing room for 4 years with this truck. We had lights...at least to my recollection we had lights, all of them or I would never have hauled all over creation ( night included ), but maybe I didn't have running lights then either or I did have all lights/power then and something burned out in the two years of no trailering ( dghter went to college, sold horse, sold horse trailer, saved truck. ). I appreciate this forum though. Since I am the computer addict and relay all forum messages to hubby. He appreciates you all too. Thanks for the words of experience everyone.