FORD 2010 F-550 v.1 - Manual (Page 109)

PANEL DIMMER CONTROL
Use to adjust the brightness of the
instrument panel and all applicable
illuminated switches in the vehicle
during headlamp and parklamp
operation.
Move the control to the full upright
position, past detent, to turn on the
interior lamps.
Note: If the battery is disconnected,
discharged, or a new battery is
installed, the dimmer switch requires re-calibration. Rotate the dimmer
switch from the full dim position to the full dome/on position to reset.
This will ensure that your displays are visible under all lighting
conditions
AIMING THE HEADLAMPS
Your vehicle may be equipped with a sealed beam or aerodynamic
headlamp system. Sealed beam headlamps may be aimed in the vertical
(up/down) and the horizontal (left/right) directions using the procedures
following. The aerodynamic headlamps can only be aimed in the vertical
direction (up/down) using the procedures following. The headlamps on
your vehicle are properly aimed at the assembly plant and should not
normally need adjusting.
Lights
109
2010 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)