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The Toyota Tundra's 7-pin trailer connector plug allows you to connect extra cargo for 12-volt power or reverse lights. For the wiring diagram, you can visit this link - https://www.tundratalk.net/threads/7-pin-connector-wire-diagram.646626/. This connector is useful for towing larger trailers and equipment, with auxiliary power provided by a compatible 30-amp plug. The price for the 7-pin trailer connector plug ranges from $25 to $35, depending on the brand and quality, while the complete wiring harness could cost between $100 and $130, based on the brand purchased.