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Wiring Diagram

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It seems every old trailer wiring setup is different from every other. But every new truck has the same wiring on their flat seven plugs. When you wire in a new flat seven plug, do it this way. This is looking at the back of the plug on the tow rig. If you are wiring a trailer up, you will have to flip this diagram over or hold the plug so you can see the part that actually plugs in.