I have a 2001 Expedition.
Sounds like its the same as yours.
When generator runs, it takes about 20 to 30 seconds to provide power to the non-inverter circuits.
Now if yours doesn't provide power after a much longer lenght of time, I'd check the breakers on the generator itself. Breakers in the shorepower must be ok and set or it wouldn't work with shorepower.
hershey - albuquerque, nm
Someday Finally Got Here
My wife does all the driving - I just get to hold the steering wheel.
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Expedition - Chevy Equinox