Ford F series Owner's Manual page 65

NOTE: You may notice that the lights flicker
when the vehicle is turned on or off.
This is a normal condition.
The Daytime Running Light (DRL) system
will not illuminate the tail lamps and
parking lamps. Turn on your headlamps
at dusk. Failure to do so may result in a
collision.
Lighting Up the Instrument Panel and the
Interior of Your Vehicle
The instrument panel lights can be turned on by
pulling the headlamp switch toward you to
either the first or outer position. You can
brighten or dim the instrument panel lights by
rotating the headlamp switch knob.
Cargo, Courtesy and Dome Lamps
The interior/courtesy lamp is automatically
turned on when the driver or passenger door is
opened. Turning the headlamp switch fully
counterclockwise will operate the interior lamp
when the doors are closed.
Interior/Courtesy lamp
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