Are you making a new harness? Or removing the military one? If the latter, just cut off the end for the vehicle side and put on a new connector. I buy old military trailer harnesses and convert them, so I have one of each for my trailers as sometimes I pull with a military truck and use the 12-pin plug, and sometimes I use a 7 blade RV plug for my civilian vehicles. Also, great when picking up a military trailer as I can just pull the old 12 pin military harness and insert my military harness with 7 blade RV plug.