Ford 2002 F650 Owner's Manual page 97

Lap belts
Adjusting the center lap belt
The lap belt does not adjust automatically.
The lap belt should fit snugly and as low as possible around the
hips, not across the waist.
Insert the tongue into the correct
buckle (the buckle closest to the
direction the tongue is coming
from). To lengthen the belt, turn the
tongue at a right angle to the belt
and pull across your lap until it
reaches the buckle. To tighten the
belt, pull the loose end of the belt
through the tongue until it fits
snugly across the hips.
Shorten and fasten the belt when
not in use.
Safety belt warning light and indicator chime
The seat belt warning light illuminates in the instrument cluster and a
chime sounds to remind the occupants to fasten their safety belts.
Seating and Safety Restraints
97