We just recently bought a 1994 Jayco 1406 and there is a ton we don't know about the thing. The people we bought it from were class A idiots and treated it like garbage but we rescued it just in time. Problem is, we don't have a manual so there are gadgets and doo dads we are scratching our heads at. We have everything but the holding tank/ water pump figured out. We turn on the pump and a stream of water comes out of a mystery pipe by the gray water pipe. No water pressure cause it's all pumping right out.
There is also a mystery spigot under the ID tag that the top corroded of and it constantly drips. Does anyone know the plumbing/ water system on these really well? The picture is the mystery spigot I mentioned. Don't know what it's called so I can't look for a replacement part.