It may well be a six pin, L blinker, R blinker, Backup, ground (-12V), Charge (+12V), Running lights, the seven pin also contains a wire for brake control on trailers with brakes that is not needed when hooking up a slide in camper. My connector on the camper itself is only six pin. I use a seven on the other end of the pigtail to the truck as I have wired in a seven pin socket in the bed of the truck to connect to. Just didn't wire the brake controler to this socket, all other pins are wired to the standard pin location on the seven pin. Just need to know which wire goes were on the camper end to go from seven pin to six. Or use the same connector on both end wired the same and mount a matching six pin socket to plug into in the bed.
For the charging, I ran a heay gauge wire from the truck battery to a continous duty selenoid then to the +12V pin of the seven pin socket in the bed. Wired the selenoid to a Key on/off circuit to charge with the key on and isolate when the key is off.
'03 F350 DRW 6.0 auto
2003 A990S Arctic Fox