RAM 1500 Owner's Manual page 117

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
THINGS TO KNOW BEFORE STARTING YOUR VEHICLE 115
4. Attach the hook to the outboard tether strap loop (see
diagram). Tighten the tether strap according to the
child seat manufacturer's instructions.
Tether Strap Through Center Tether Strap Loop And
Attached To Outboard Tether Strap Loop
2