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I tried to add a HDMI from my Dish to TV and found they only come in 6 foot lengths.
I see now you can get them longer at Amazon. Plus you can get a coupler if your cable is too short. Why do you need a wiring diagram? Just run the wire and go. If the wire is loose, you can attach the HDMI to the coax and pull it through. Just a lucky thought. May not work.
Running a new wire is hard even with a wiring diagram. Sometimes you can find a raceway in the roof. Try taking off some of the lights and follow the wires. Without seeing the rig it is only speculation.