Ah yes, the isolator. Thanks for pointing that out.
As for the valves, ive adjusted those within the year and within seven thousand miles. Thanks for pointing that out as well.
the noise is loud enough to hear while driving and loud enough to hear when the hood is up and im looking at the running engine.
I dont have my multimeter to check the isolator yet, and or any of the circuit connections going to and from the isolator, BUT i did have a wrench and i disconnected the camper battery and the noise went away. Soooo, the noise is gione but the underlying issue is not, nor is the fact that now i dont have electricity to the camper. HAHAHA
I think this means that there is an issue in the circuit between the camper battery and some thing downstream from it. When i have the chance i will check the isolator as you suggest and any circuit breakers in the circuit, and use some toilet paper to aurally isolate the noise (if i reconnect the battery to bring the noises back). Thanks again, and i hope to share what the source is once i figure it out.