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Yes.......the blue lead is for the brakes on the 5th wheel and should go to a blue wire in the box. Green is for lights off the pigtail on the truck. Usually, it will be green on the 5th wheel as well. You can take one of the taillight lenses off and check the wiring colors back there. White is ground, black is for the hot lead to the battery of the 5th wheel for charging, red is left turn, brown is right turn and yellow is for backup lights. Those are the remaining colors of the 7 in the cord. IF you aren't sure, attach a photo of the wiring in the 5th wheel J-box to your post or give me the number and colors of those leads and how you hooked them up. Camping World just wanted you to have to come down there to them! They have a bad reputation for the most part for service. I will be out for some time this morning, so be patient about me getting back to you. All follow ups are included in our fee.
Probably.......plug in the cord and turn on the lights ONLY and see if the lights come on. The black wires should have been one to the black lead from the truck and one to the brake lead USUALLY. Tbose are to the breakaway switch. But if you are certain that is the way they came off and everything worked before, then it may be fine. There is more than one way to wire thiese up.
Yes.........go ahead and sorry for the delay in getting back to you as I am out of the shop todayl
Check the fuse in the fuse box and see if that is blown. The ones for the trailer are separate from the truck. It might be that simple.
The lights fuse for the outside is in your truck.............
What is the year and model of your truck? Did you check for voltage AT the light pin in your plug socket?
Did you try hooking up a 12 VDC power source directly to the green/white wire and a ground to see if that is the marker lights lead?
Attaching a diagram for the plug if you don't have one.......... https://www.etrailer.com/question-363.html
Those locations are correct, but on a 7 lead cord the colors they list are wrong. See this link for the correct colors. http://rvbasics.com/techtips/rv-travel-trailer-plug-wiring.html
Were you able to get this sorted out here? Let me know if you need more on this and I am making a phone chat offer for you if you think that would be more helpful and faster.