well here's the whole story
We went camping for a day at a campground near us. Just to get used to the hookups, how to dump stuff, and to check if everything works.
Everything worked the furnace, water heater, water lines, dump valves and other things but we could only get a trickle or thin stream out of the hot water lines. We had trouble the whole time.
Come to find out there are manual bypass valves in mine under the galley sink behind some shelving. These valves seemed strange to me as to the settings and I realized they were the hot water heater bypass valves. So after working on them for a day and finally taking one off I started realizing how they worked (not really how I thought they worked). I realize now that the input bypass was installed wrong, even though it still worked that way it would have been better installed correctly. Given that fact, The whole time we were struggling with the hot water trickle the only problem was the input valve was turned to "bypass" setting. Unknown to us and to the camper people that I showed pictures of the valve to. When we finally took one apart and found out how it did function it was a easy fix.
Today we used the Winterizing system by filling the little bypass tank with 2 gallons of "the pink stuff" (antifreeze) turning on the Winterizing switch and setting the water heater bypass valves to the bypass position (understanding now that one of the valves was installed incorrectly) then turning on the pump and it did a wonderful job of pumping "pink" to every faucet and drain as well as the toilet. It felt good !!!!!!!!!!!.
What a trial this has been but now I know, pretty much, all the plumbing in that motor home.
Thanks everyone for your help. Dave........in central IL.