Navy, in your original post, are you saying that you get 12vdc in the trailer if it is plugged in? Your 12v stuff works? Then when you disconnect 120, the 12vdc goes away?
Yes. That is correct. Everything works fine while I have shore power hooked up or if I am connected to the truck and it has to be running otherwise the 12v stuff does not work. There are no blown fuses that I can find and there are no battery cutoff switches and there are no reset switches that I can find between the battery and trailer.....