6-way connector + question

Well, my coach only came with a six pin connector so maybe his also came that way. I only use five of the wires to tow my Cherokee for the turn/brake, running and ground connection. I use the fifth wire to active the towed brake application light i installed on my coach dash so that when the towed brake pedal is activated the LED light informs me they are applied. Don't want an inadvertent application going undetected and destroying the brakes on the jeep or worse causing enough heat to set a tire on fire. I don't remember what pin I used as Gulf Stream or the previous owner had only four wires in my six pin socket.