The Toyota Tundra7 pin connector trailer plug is a connector that will allow You to hook up an additional pick for 12-volt-power or backup lights. You can find the 7 Pin trailer wiring diagram here at link - https://www.tundratalk.net/threads/7-pin-connector-wire-diagram.646626/ . It is used to towing bigger trailers and equipment. The auxiliary power is supplied by a compatible 30 amp rating plug. The cost for the plugin trailer 7 pin connector will range from $25 - $35 depending on the brand and quality and the full wiring harness will cost about $100 - $130 depending on the brand purchased.
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