Here is a good diagram showing both 6 and 7 pin connectors. It also shows the vehicle receptacle and trailer plug.
If you dont actually need the 7th pin, you can just replace the 6 pin connectors and rewire per the diagram. Usually the 7th pin is unused.
Trailer Wiring Diagrams
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Bruce & Carolyn Wittmeier
2001 Ford F250 PSD, Ext cab, Shortbed, Island Blue/Silver, 4X4 Off-road, SOF Auto, Alum Wheels, DP-Tuner 40/80/120HP, Chrome Step, Line-X bedliner, Jordan Ultima 2020, AirLift 5000 Airbags, DiPricol gauges
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