With all the connections they have to make, it's bound to happen.
We had an issue with our headlights. One morning I was planning to leave at 3:00 AM to go to Camping World and had no headlights. So needless to say I was stuck at home until the sun came up so I could see what I was doing. I found that the ground for the headlights was attached to the frame with an aluminum self-tapping trim screw. You know the white oval head phillips screw type. The round terminal connector was larger than the head of the screw so they used a flat washer which was only slightly smaller. The frame did not have the paint removed so the connection was only being made by the threads of the screw. It had ozidized and presto, no lights! I had a tough time getting to this connection because it was behind the mass of wires going back to the firewall. I cut at least 5 wire ties to move them to the side. I wire wheeled off the paint, drilled a hole and used a stainless steel bolt to make the connection through the terminal connector, then sprayed the connection with battery terminal protector.
The other wiring issue we had involved the connection of the cord to the box in the electrical compartment. We purchased a RS3000 Xantrex Invertor at Camping World which included a system monitor panel inside. I started getting a Low AC input Line 1warning on the panel. When I checked it out and traced the wires I found that the Line 1 feed had burned the lug in the box and was barely making any type of connection. This was a result of the lug not being tightened completely. The wire was discolored from the heat. I cut off about 1 foot of the cable to make sure I had good wire to work with and there was a spare unused lug to make the connection since the other was cooked. I hate to think what may have occurred had I not purchased that invertor. I later had the cord replaced because the head was seperating from the cord. I now make it a habit to check those wires and any significant connections before and after each trip. Hopefully these are the only two problems we'll have.