Monitor Circuit Blows Fuses

Well, I found it! After much trial and error with a multimeter, I found where, for some reason, a previous owner had cut the wire in two, stripped the ends back and stuffed them back into the wall where the TV cable outlet is located. The wires, of course, then shorted out against the metal skin of the trailer. I repaired the connections and now all of the components that were inoperative in my original post work! Even all the tank level sensors seem to be working normally.