Some of the older Fords required a fuse to be installed in the charge circuit. By 2017, I believe that was eliminated and the charge circuit was active without having to install anything. I kniw that my 2018 didn't need anything done for it to work.
Where are you testing that charge circuit? Are you testing it at the truck, at the battery, with the ignition on or off, etc?
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2017 Jay Feather 7 22BHM Baja/Andersen WD
2018 F150 4x4 3.5L Ecoboost Max Tow
2015 MB Sprinter 2500 Passenger 2.1L Diesel
2007 Ram 2500 4x4 Cummins 5.9L G56
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