So, looking at my NTU PUP, I noticed something unique and confusing on the tongue. Seven pins in a connector on the tongue, into which plugs the seven wire harness beside it. The confusing part is that the other end of that harness is this 4 flat connector. Any ideas what may be going on here? I haven't yet stripped off any tape to trace the wires, and haven't followed them into the PUP either. I would assume this would be a seven pin wiring for trailer brakes and charge etc, but the PUP is not equipped with brakes. Thoughts?