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The 300A MRBF fuse is for the inverter and has nothing to do with the coach main 12V power.
So you are saying that if you plug the panel directly into the mainboard, it lights up and works normally?
If so, then you likely have a bad wire in the wiring harness. There is no fuse in the wiring harness that runs from the Gx Mainboard to the touchscreen.
It is possible a wire has gotten pinched and now you don't have power at the connector coming out of the wall. That would not be surprising given the lack of Thor's quality and workmanship when running the wiring throughout the coach.
If that is the case, it is going to be a major challenge trying to run a new cable. You will never be able to to do the same run they did at the factory.
I don't know where the panel is on the wall in the BH35 but if this happened in my SV34, I would contact Firefly and ask them them the length of their longest replacement wiring harness. I would then run a new wiring harness from the Gx Mainboard through the floor under the bed where all of the wiring comes into the electronics bay. I would then route the harness through the frame and over to the storage bin under my dinette area and then up through the floor under the dinette seat that is adjacent to the wall where my panel is mounted. I could then cut a hole in the wall under the dinette seat and fish the new cable up into the wall and to the opening where the panel mounts on the wall.
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