FORD 2005 F-550 v.2 - Manual (Page 181)

Make sure the corresponding lights illuminate or illuminate briefly. If a
light fails to illuminate, have the vehicle serviced.
• If the driver’s safety belt is fastened, the
light may not illuminate.
2005 F250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA_English (fus)
Driving
181