It is on a fuse in the 12 volt distribution panel. However, you won't find one labeled Furnace. It is a control wiring circuit. The circuit 12 volt circuit will be shared by the fridge, wh, Range hood and maybe others. T-stat off does not work? You might get lucky and find one labeled furnace as it is the largest draw because it runs the fan motor.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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