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You will need a "RECEIVER HITCH SUB HARNESS (BRAKE JUMPER) - 2012 Nissan Frontier (241677S000)" for the trailer brakes and TOW HARNESS - 7-PIN - 2012 Nissan Frontier (999T8BR020) will give you the 7 pin connector and the required relays for it all. The 4 pin connector may not have all the relays needed and they do not sell just the connector without the relays.
