Mercury 1996 Grand Marquis Manual page 109

Lighting Up the Interior and Instrument
Panel
With the parking lamps or headlamps
illuminated, you can brighten or dim the lights
in the instrument panel. To do this, locate the
switch above the headlight control knob and
press it up (to brighten the lights) or down (to
dim the lights). To turn the interior lights on
and off, push the headlamp knob in.
The knob controls the light on the instrument panel and
the interior light (autolamp feature shown — other models
similar)
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