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15. With the new headlight switch in place, it’s ready to be reinstalled in the car after we connect our final two wires (more on that in the next photo). Notice the new switch not only has the “pull for fog” icon as well as the fog light indicator lamp, but notice the little lamp icon with the “A” in it. Yep, with the installation of this switch, your Mustang’s factory automatic headlamp function becomes enabled.