Best Trailer Wiring Harness For 2025 Nissan Frontier S Model

Question

Question:

which T1 wire harness is the right one for a 2025 nisan frontier S model

asked by: Dan

0

Expert Reply:

Hello Dan, thanks for reaching out. We do offer a wiring harness for your 2025 Nissan Frontier S. What you will need is the following:

- Replacement Wiring Harness for Curt T-Connector Nissan Vehicle Wiring Harness with 4-Way Plug # C55441

What kind of trailer are you pulling? Does it have electric brakes?

expert reply by: Jesse M

0

Jesse M.

9/29/2025

Hey Dan, did you decide on the 4-flat or the 7-way wiring harness for your Nissan Frontier? I'm curious about your choice because it could help others with similar towing needs.

Dan

10/2/2025

@jesse think im going with the 4-flat because i dont have a tow mode button or a brake control box on my truck im just pulling a 12foot trailer with a rideing mower to property that i have i have a bigger truck allready with the 7-way

Jesse M.

10/2/2025

@Dan Ok great! Just thought I'd check in. The Curt # C55441 is what you will need then.

Canadian R.

6/25/2026

@Dan. You do, pop the covers off on the left side, 14 dollar switch and all s models have tow mode. No software required

Canadian R.

6/25/2026

Is the 26 s model the same wiring? I need the 4 and 7. Will ne installing a electric controller also

Jesse M.

6/26/2026

@CanadianR Yes the 2026 does use the same wiring as the 2025 model, but unfortunately the two Tekonsha harnesses I mentioned above are no longer available. All we have now is the Curt # C55441 for a 4-flat. This harness does not come with the relays for activating the tow package though.

Answer 1

Hey Edwin, this is a known issue with certain Nissan models. A lot of times there will be some wiring already in place but no relays. The Tekonsha #118266 comes with the necessary relays as well as the 7-way plug but sometimes there still is a…

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Answer 2

Yes, you do Eric. None of the 2025 Nissan Frontier's without the trailer connectors came with the wiring relays. Nissan's been doing this for quite awhile to save production costs. To add a 4-way connector that includes the wiring relays,…

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Answer 3

This is actually a fairly common issue with certain Nissan vehicles but it should be a simple fix. It sounds like the relay for the trailer running light circuit is either missing or needs to be replaced. This relay should be located behind the…

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Answer 4

Are there still open spots on the fuse panel? A lot of times there will be 1 brown relay that activates the 12v power for the trailer connector, and there will be 2 blue relays which are for the turn signals. So even though there are already 3…

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Answer 5

On certain Nissan vehicles like yours an additional blue relay is sometimes needed to activate the trailer running lights circuit. This appears to be the case with your 2018 Nissan Frontier since this circuit isn't active. This is a very common…

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Answer 6

Trailer running lights not working with certain Nissan vehicles is a common problem with an easy fix. There is a relay for the trailer running light circuit that is located in the fuse box (in the cab). If that relay is missing or no longer functions…

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Answer 7

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 8

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 9

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 10

Hey Jonathon thank you so much for all of that additional information! To haul your bikes behind your class C Sprinter motorhome, while flat towing your Mini, I recommend the Hollywood Racks RV Rider Bike Rack item #HLY64FR and the Roadmaster Dual…

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Answer 11

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 12

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Best Trailer Wiring Harness For 2025 Nissan Frontier S Model

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