1978 (or '77) Itasca Seafarer (class C)...RV newb
I suggest that you make it a part of the deal that the present owner teach you how to make everything work. There are two reasons for that. Not only does it show you how, but it also proves that things do work. Of special importance is the refrigerator. You should ask that the seller have the RV plugged in and the refrigerator operating with ice frozen in the freezer to show that it does work. Have him demo how to change from electric power to propane for it's operation. Have them show you how to start the furnace and observe that it operates and that it puts out heat, and not just blows air. Then have the present owner show you how to start the air conditioner. Use a thermometer to check the temperator into the inlet and then to the outlet to be sure that the temperature is decreased by at least 18 degrees. Make sure that the water heater is operating. Have the seller show you how to light it, then be sure that it actually heats the water. Flush the toilet. and while there, ask how to put the chemicals into the holding tank. Look into every opening in the RV and open every door. Ask how to check the monitor panel and see what the tank levels are. Where is the propane tank and how is it filled? How do you turn on or off the propane supply? Where is the chassis battery and also the coach battery? Does the battery have an isolator, and if so, how does it operate? Makse sure that there is water in the stoarge tank. Ask how to add more water to the tank. Have them turn on the water pump and listen to be sure that it runs for a min. or so, the stops and does not run again as long as no water is used. Listen to the pump for at least five min. as a check for leaks in the plumbing. If the pump runs just a little from time to time, that means that there is a water leak. Have them show you how to connect city water and how to use it. Run water into each sink and the tub if there is one, to make sure that they hold water. Check both hot and cold water. If there is a microwave, heat a cup of water in it. Do the same for the stove top and also the oven. Make sure that you are shown how to use each of those. Learn where all lights are and how to use them. Basically, test everything.
How do you start and stop the generator? Where and how do you connect shore power? Run the generator and then power the air conditioner from it, as well as from the shore power. Check the heater and the air from the dash to make sure they both work properly and put out heat/cold. Check the tires for the date code. If you find the DOT numbers, the last four digits will be the week and year of manufacturer. Those numbers are recessed into the tire as each tire gets them stampped, as they are not part of the mold.