Ford F-550 Owner's Manual page 127

Seating and Safety Restraints
2. Pull down on the shoulder belt
and then grasp the shoulder belt
and lap belt together.
3. While holding the shoulder and
lap belt portions together, route the
tongue through the child seat
according to the child seat
manufacturer's instructions. Be sure
the belt webbing is not twisted.
4. Insert the belt tongue into the
proper buckle (the buckle closest to
the direction the tongue is coming
from) for that seating position until
you hear and feel the latch engage.
Make sure the tongue is latched
securely by pulling on it.
127
2007 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)