RAM 2013 CHASSIS CAB 3500 Owner's Manual page 153

This is also known as the Party mode because it allows
the doors to stay open for extended periods of time
without discharging the vehicle's battery.
The brightness of the instrument panel as well as the
ambient lighting can be regulated by rotating the dimmer
control right (brighter) or left (dimmer). When the head-
lights are on you can supplement the brightness of the
odometer, trip odometer, radio and overhead console by
rotating the control to the right until you hear a click. This
feature is termed the "Parade" mode and is useful when
headlights are required during the day.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 151
Dimmer Control
Courtesy/Reading Lights
Both lights in the overhead console and rear passenger
compartment will illuminate as courtesy lights when a
door is opened, when the dimmer control is rotated to the
courtesy light position (full right position), or when the
UNLOCK button is pressed on the Remote Keyless Entry
3