Ford 2011 F-250 Owner's Manual page 410

Accessories
• Mobile communications systems may harm the operation of your
vehicle, particularly if they are not properly designed for automotive
use.
• To avoid interference with other vehicle functions, such as anti-lock
braking systems, amateur radio users who install radios and antennas
onto their vehicle should not locate the Amateur Radio Antennas in
the area of the driver's side hood.
• Electrical or electronic accessories or components that are added to
the vehicle by the authorized dealer or the owner may adversely affect
battery performance and durability.
410
2011 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)