Rick,
With all due respect, I think you are at the point where you provide us with some photos of your suspected problem areas (third time we have requested this) and/or call a mobile RV tech. As Mike noted, we are "shooting in the dark" when trying to advise you as we are not sure what you are referring to. Since you said that the coach had been sitting for some time, it is very possible that it has multiple issues. I (we) have asked specific questions regarding to help you ID the problem(s). For example, I asked if you had house and chassis battery voltage on the large studs of the isolator. No answer. As Fred noted, we are trying to help but w/o answers to our specific questions it is impossible for us to be of value to you. This is doubly important in the case of someone not familiar with RVs.
Steve