Ford 2000 Excursion Owner's Manual page 107

5. Refer to the Installing child safety seats in combination lap and
shoulder belt seating positions section of this chapter for further
instructions to secure the child safety seat.
6. Tighten the child safety seat tether strap according to the
manufacturer's instructions.
If the safety seat is not anchored properly, the risk of a child
being injured in a collision greatly increases.
Seating and safety restraints
107