RAM 2500 2019 Owner's Manual page 286

284 SAFETY
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
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 At-
tached To Outboard Tether Strap Loop