Possible that wire has rubbed thru the insulation on some metal edge or a screw somewhere after it disappears from view. Would have thought the furnace 12 vdc wiring would be from the fuse panel. But obviously the wire is somehow associated with it. You may have to open up whatever panels you can to access the furnace wiring and see if you can find a red wire there.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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