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The fuse could be connected to anything that Fleetwood installed that requires constant 12 volt power .
Just guessing; but dash radio comes to mind , otherwise leave the fuse out and see what doesn't work.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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