Ford 2004 F150 Owner's Manual page 137

Seating and Safety Restraints
1. Position the child safety seat in a
seat with a combination lap and
shoulder belt.
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.
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