Finding What Blue Wire of 2010 Nissan Frontier Trailer Wiring Harness is For

Question

Question:

2010 Nissan Frontier has a blue wire separate from the 4 pin factory harness. I pulled the blue wires from my trailer, along with the other wiring on my Q3 Tracker trailer, hoping the new 4 pin harness would work with the existing truck harness however, I now have running lights but no brake lights or turn signals. I think the blue wire might have been for electric brakes? Not sure, but I was wondering if this harness should work/control my brake lights and turn signals without the blue wire being wired? I feel it was a mistake to remove the blue wire, and will probably wind up buying another harness, but was wondering if there might be another reason I dont have blinkers/brake lights.

asked by: Lisa A

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Expert Reply:

It's pretty hard to say what the blue wire is for but the best way to identify what it does is to use a circuit tester like part # PTW2993 to test it when you apply various turn signals/brakes and see at what point it has voltage. Other things to check are fuses and relays for the vehicle's factory wiring.

expert reply by: Jameson C

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Answer 1

Yes, there will be fuses associated with the trailer lightning circuits on your 2014 Nissan Frontier in the engine bay fuse box. The correct locations will be listed for you on the underside of the cover but as they do not list these in the…

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Answer 2

On many Nissan vehicles there is an additional running light relay, #C57000, that is needed for the trailer running lights to work. It is normally located in the in-cab fuse panel. Nissan does not list fuse and relay locations in the owner's…

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Answer 3

To add a 4 flat to your 2017 Nissan Frontier with the factory tow package you need the Hopkins Plug-In Simple Wiring Harness #HM43575. I've added a link to a video review of this part for you to take a look at as well.

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Answer 4

The Hopkins Plug-In Simple Wiring Harness #HM43575 is a plug-in style 4-Way flat connector that is compatible with the following vehicles: 2009 - 2012 Suzuki Equator with factory 4-Flat connector 2005 - 2018 Nissan Frontier with factory 4-Flat…

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Answer 5

At this time we do not have the relays and wiring connector sold separately for the Curt T-Connector Vehicle Wiring Harness #C56225. This part is required for the 4-way flat trailer connector to function if your 2007 Nissan Xterra came from the…

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Answer 6

The #HM43575 would work as a replacement, you would need to unplug your current harness and plug in the Hopkins in the 4-pole connector slot; you can see exactly where in the photo I've provided. I've also attached a link to a video review of…

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Answer 7

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 8

The Hopkins Plug-In Simple Wiring Harness #HM43575 referenced in your question is confirmed to fit your 2006 Nissan Xterra, but this will provide you with a 4-Way flat connector and not a 7-Way. In order to install a fully functional 7-Way connector…

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Answer 9

If your 2006 Nissan Frontier does not have the factory trailer wiring it would need relays to activate it. For that you would need the part #C56225. If you have the relays already all you would need is the part #HM43575. If you look behind the kick…

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Answer 10

If you are unsure if you have the tow package or not, the only way to find out for sure would be to contact a dealership with your VIN. With certain vehicles we can sometimes check to see if certain electrical components are present, like a 7-way…

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Answer 11

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 12

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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Finding What Blue Wire of 2010 Nissan Frontier Trailer Wiring Harness is For

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