Ford F series Owner's Manual page 94

Battery Saver (with Remote Entry — If
equipped)
When the ignition is turned off, the vehicle will
turn off battery voltage to all of these lights after
45 minutes: glove box, engine compartment,
overhead console, mirror, courtesy and
interior (including cargo) lamps.
This will prevent draining of the battery if these
lights have been left on inadvertently or if a
door is not completely closed. Battery voltage to
these lamps will be restored when the remote
entry transmitter is used, any door is opened, or
the ignition key is turned on again.
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