Yes, you can connect a 7-pin trailer to a truck with a 4-pin connector. You will need an adapter. These adapters are easy to find at auto parts stores or online.
However, keep in mind that the 4-pin connector handles basic functions like lights (turn signals, brake lights), but the 7-pin can also handle things like trailer brakes and auxiliary power. If your trailer has extra features like brakes, you won't be able to use those with a 4-pin connector unless you upgrade your truck's wiring.
Good luck finding a trailer!
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