Ford 2013 F-650 Owner's Manual page 70

WARNING: Driving a vehicle with the brake system warning
light on is dangerous. A significant decrease in braking
performance may occur. It takes you longer to stop the vehicle. Have
the vehicle checked by your authorized dealer. Driving extended
distances with the parking brake engaged can cause brake failure and
the risk of personal injury.
Charging System
It illuminates when the 12–volt battery is not charging properly.
Contact your authorized dealer as soon as possible. This
indicates a problem with the electrical system or a related
component.
Check Fuel Cap (gasoline engine only)
It illuminates when the fuel cap may not be properly installed.
Continued driving with this light on may cause the service
engine soon warning indicator to come on.
Check Suspension
It illuminates when the air suspension dump switch has been
CK
activated.
SUSP
Check Transmission (Allison automatic transmission only)
It illuminates while driving if a problem has been detected in
the transmission; shifting may be restricted. Depending on the
severity of the problem, the shifter's digital read-out may turn
blank.
On MD 3000 series transmissions, operation may continue in order to
reach service assistance. The control unit may not respond to shift
selector requests, since operating limitations are being placed on the
transmission (i.e. upshifts and downshifts may be restricted). Direction
changes do not occur.
Cruise Control
It illuminates when you switch this feature on.
2013 F-650/750 (f67)
Owners Guide gf, 2nd Printing, March 2013
USA (fus)
Instrument Cluster 69