[wiredgeorge]

Didn't mention year/model so not sure if the thing is under warranty. If so, take it to your dealer and let them deal with it. If you need to fix this yourself:

1. Cockpit error; you are not setting the dish/receiver up properly. You didn't mention which type dish/receiver so can't help here. I have DishTV with Playmaker dish and wally on my rig. Here you would need to call DishTV after ensuring the TV was connected correctly and set up so a DishTV signal would be on the screen (proper input for the TV).

2. You say you have TWO Sat TV connectors on the outside of your trailer? Why? Most portable dishes only have the ability to run one signal. If they are intended to be satellite inputs, consider the label-sticking-on guy didn't have a clue what they were for and mislabeled the inputs. Consider trying all coax inputs on the outside of the trailer in the event the guy labeled wrong.

3. If there are TWO sat inputs and neither worked, consider one is supposed to be for one area and the other another area. Can't see why they would give you two and put Y splits so time to check each run individually. First, check the most likely input by pulling off the outside fitting where the cable is connected and check to ensure it is tight. Do the same for the inside connector. If these seem OK, may be a cable itself.
Buy a spool of 20 ga wire and clip one end to the in-trailer conductor in the coax. Then un-spool the wire and run it to the other end outside. Use a multimeter to check continuity. Ohms on lowest value and touch the wire connected to the inside conductor and touch the conductor on the outside. If the wire is good, take a second to ensure you have RG6 coax and NOT RG58. It is on the cable. If you have continuity consider either the bulkhead connector is bad or perhaps the inside connector. You can also check continuity in a similar manner on the shielding which provides ground I think.

If the wire is bad, you likely won't have much luck dragging a new one through the path the original is in even using the original as a fish as the connectors will snag on something. At this point, I would make a small hole the side of the trailer adjacent to the location of your receiver and install a new bulkhead connector and use a short run on the inside to connect the receiver.

3. You can try the alternate coax input using the same steps.