Have you been driving through rain? It is too common for the furnace control board to get wet especially with your vintage coach. Even if not wet, the corrosion on the control board could be causing an intermittent short as you drive down the road and blowing the fuse, but you don't see it until you have setup camp and the A/Cs don't work because the thermostats have no control power.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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