Your RV's furnace fan and control circuits are 12 VDC. Look in your power distribution panel and you should see a 12V fuse labeled furnace? I don't know where your thermostat is - ours is on the wall about middle of the coach.
Once you locate the thermostat, you should be able to turn everything off there - or you can kill the power at the dist. panel. Good luck.
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Jack & Marty
2018 Laredo 298 SRL
2011 F-250 SB Crew Cab 4x4 6.7L
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