Troubleshooting 7-Way Trailer Connection Wiring on 2017 Nissan Frontier

Question:

I recently installed a Curt brake controller and 7 way plug on my 2017 Nissan Frontier. When the vehicle is started pin #2trailer brakes is presenting 14.52 volts which locks the trailer brakes. I did reuse the relays from the 4-way flat connector that I had previously installed.

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Expert Reply:

In your 2017 Nissan Frontier, the Curt brake controller should be installed using the custom wiring adapter # C51382. This should work correctly to give you the proper wiring within your cab. Then you will use the Curt # C56226 or the Tekonsha # 118266 to get the correct 7-way. If you have done this even using the previous relays, check your trailer connection for functions using the attached photo and a circuit tester like # PTW2993.

It sounds like the trailer may be mis-wired and needs to be tested if the 7-way on your vehicle is correct. I've attached a photo to assist with this and have attached an article to assist as well. You can test the trailer wiring using a battery to connect the negative terminal to ground and then positive to test each function.

Let me know if you need further troubleshooting assistance.

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Jason S

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