I wouldn't be too hard on the tech. Every RV manufacture is mostly made up of people who never RVd a day in their entire life. When they build the RVs those people strike off on their own with basically not much of any standard from RV to RV. They don't label much of anything so when they change from year to year it is any bodys guess where those cables go or what they were thinking at the time. Unless the wiring diagram is in your manual you just need to trace wires. That is time consuming. Most RV shops will do that for $80 to $100 an hour. A tech installing satellite dishes isn't getting paid to trouble shoot RVs and trace wires. JMHO