No third brake light

can someone share with me the electrical connections at wiring harness under fender liner mine was cut and i see a white wire that was grounded to frame ? Is this needed to make 3rd light work. All wiring missing including contact points on inner and on rear gate

have pulled new wires waiting on new kit for pins and covers

The white wire you see grounded to the frame is most likely the remains of a trailer harness that was cut away. I just checked wire colors and I believe you are looking for a white/tan and black wires. Just finding a ground will not work if a switched ground is needed. If it was cut out the remains will be there somewhere.