Remove the J1939 female connector from the J1939 port in your truck. Then plug the j1939 female connector to the J1939 male connector. J1939 ELD Splitter Y Cable Green Type-2 J1939 Male to Female to OBD Ii Splitter Cable (J1939 to OBD2 Splitter Cable) for Freightliner Truck ELD & Coder Reader.
