Cadillac 1967 VVI Data Book page 140

On the Fleetwood Brougham Sedan, adjustable reading
lights are located on the upper rear quarter trim panels. These
lights can be adjusted individually to direct illumination where
desired by rear seat passengers, while reducing glare for the
driver. The lights are operated separately by a manual switch
located just ahead of each light.
Turn signal
The turn signal lever is located on the left side of the steering
column. Move turn signal lever to the "up" position to signal
a right turn, and to the "down" position for a left turn. This
activitates flashing signals on the right or left, both front and
rear of the car, to inform oncoming and following drivers of
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the direction you intend to turn. Directional signal indicators
are located on the top of each front fender to indicate to the
the driver the turn being signalled, without requiring him to
take his eyes off the road. When the steering wheel returns to
the straight ahead position, the flashing signals automatically
cancel.
When making a partial turn, such as when changing lanes
the driver has the option of moving the turn signal lever part
way to a detent stop. The signal will continue as long as the
lever is held in this position and will automatically cancel
when the lever is released.