I cant see any part of the tank other than the small part where the low point drains are. I can see the drain tube for the FW but no wiring attached to the tank. have not taken any resistance reading with meter yet. will try that next to see if i have continuity. It looks like the tank is under the flooring but not exposed to the outside. but in any case thanks for all the help.
(2 hrs later)
exposed area above the FW tank and under the queen bed and saw no wiring that resembled the wires to the monitor panel It appears the ground wire for all the tanks are located where I cant see. So, i think the wisest thing now would be stop and when i go in for service, let them do it!