I had a similar issue with a dash mounted cigarette lighter .
Are you testing with a volt meter or a 12 volt test light ( bulb not LED ).
My socket the fuse was blown and the power ( on my voltmeter ) was a cross feed from a roof mounted 8 watt solar panel ; enough power to show voltage , BUT , not enough to power anything .
Look for a blown fuse.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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