Hello, just bought a 57 F100. Tail lights did not work when I got it, however, the previous owner did run new wiring to the back. I bought new bulbs and put them in and lights did not work. I have a test light and tested the wiring all the way from the switch on the dash to the tail light socket and have power all the way(test light comes on when touching connection inside the socket) A weird side note though- I also get the test light coming on when I touch the housing itself. Bulbs will not light. I'm assuming it is some kind of ground problem, but now sure what. Any help would be appreciated.