Ford 1999 Windstar Owner's Manual page 144

Seating and safety restraints
5. Insert the left and right safety
belt tongues into the left and right
slots of the crotch buckle. Verify
that the indicator window on each
tongue is green to ensure proper
safety belt connections.
6. Fasten the right and left chest
clip halves together and adjust the
clip to comfortably hold the
shoulder belts in place over the
child's chest.
The chest clip is designed to easily
pull apart in a collision. The clip
helps to keep belts snug on a
sleeping or squirming child.
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