[DKDarrow]

Hey Bill........and MR. Pop Rivet.............Good to hear from you Bill!!!!

Hmmmm this sounds encouraging about the common ground. Wonder where that might be???..........In the panel wiring???.....You are correct about the battery itself getting readings and lights, fan, etc working, so that would mean that the ground is good there......So would the ground for the sensors be between the panel and the tanks...........???????
The plug on the panel board has bare wires on it would seem each sensor circuit/tank......I assume these are grounds for that particular tank/sensor.......
I need to pull the panel off again and see if I can trace that particular harness/bare ground wires as they leave the panel/board plug......

Getting ready to head out in the trailer for a few days/week or two.....SO PLEASE LET ME KNOW WHAT YOU FIND.......I will be monitoring this..........

THANKS............Dennis