6-way connector + question

So I need to wire up the 6 way connector on my truck. I’ve got all the other wires figured out. I don’t have my MH or the cable at home yet. Looking on line it shows the middle pin to be the batt +. Just want to confirm, maybe someone has there’s they can verify for me.
When I do have the RV home the truck won’t be because my son will have it moving his stuff to his apartment and we are driving down and will tow it back. I would like it all set up before then.
Thanks