Yeh, I'm trying to figure out where the SAE connector on the outside runs inside the trailer. I looked in the battery area and the junction box near the batteries but didn't spot anything. BTW, we have a belly pan so everything is covered up underneath. I guess the next place to look is perhaps behind the fuse and breaker panel which in our case is located below the bottom bunk bed. Thanks, FunFinder for not including any wiring or technical information on our trailer! I was putting off having to sit a couple of ours on the floor and peering into the cavity but it may be worth it!
2003 F250 7.3L Powerstroke Crewcab longbed