Ford Mustang Owner's Manual page 62

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.
Turning On the Exterior Lights
To turn on the headlamps, parking lamps,
license plate lamps, side markers, and tail lamps,
use the control knob that is to the left of the
steering wheel.
Headlamp switch location
The knob that controls the headlamps and parking lamps
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