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So from your meter readings it is “likely” that shorting orange to white in one of your previous tests is very likely blowing the 5 amp fuse and killing the propane detector and the other loads/functions you mentioned that are strangely connected and powered from that same 5 amp fuse. When your fuse is good and plugged in and the 68 ohm resistance sensor black wires are each connected to white and orange wires (assuming you have not used any propane from the tank to change that resistance value) you are drawing approx 0.2 amps through the 68 ohms......roughly 2.6 watts.....which is likely why the variable resistance sensor at the propane tank gets warm to the touch. That does not sound normal to me.
You say when the 5 amp fuse is out and each propane tank sensor black wire is connected to each of the orange and white wires (one black to orange; the other black to white) you get correct readings on your inside coach level sense panel? Sounds like the 5 amp fuse wiring is somehow connected accidentally to the orange wire directly (like a short circuit or it is mis-wired somehow)? Might have to get specific wiring details from Thor on that 5 amp fuse load and what fuse is supposed to be powering the level panel inside the coach. Maybe the level panel is powered correctly when the 5 amp fuse is out through some other "assigned fuse" for the level panel.....and works fine when the 5 amp fuse is out. Sounds like a wiring fault to me.
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