RAM 2013 CHASSIS CAB 3500 Owner's Manual page 109

Tether Strap Loop With Head Restraint
In Raised Position
2. Place a child restraint on the seat and adjust the tether
strap so that it will reach over the seat back, under the
head restraint, through the tether strap loop behind
the seat and over to the tether strap loop behind either
the right or left outboard seat.
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 107
3. Pass the tether strap hook under the head restraint
behind the child seat, though the tether strap loop
behind the seat and over to the right or left outboard
tether strap loop.
Tether Strap Through Center Tether Strap Loop
2