Trailer Wiring 7-Way Upgrade Kit

Trailer Wiring 7-Way Upgrade Kit

Item # ET7WK

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ET7WK - Junction Box etrailer Wiring
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This kit contains everything you need to upgrade from a 4-way, 5-way, or 6-way connector to a 7-way connector. Includes 7-way RV-style trailer connector, junction box, wire loom, and hardware. Call 800-298-8924 to order etrailer accessories and parts part number ET7WK or order online at Free expert support on all etrailer products. Guaranteed Lowest Price and Fastest Shipping for Trailer Wiring 7-Way Upgrade Kit. Accessories and Parts reviews from real customers.
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  • Reviews (21)
  • Q & A (189)
  • Videos (2)
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etrailer Accessories and Parts - ET7WK

  • Wiring
  • Junction Box
  • etrailer

This kit contains everything you need to upgrade from a 4-way, 5-way, or 6-way connector to a 7-way connector. Includes 7-way RV-style trailer connector, junction box, wire loom, and hardware.


  • Kit allows you to upgrade from a 4-way, 5-way, or 6-way connector to a 7-way connector
    • Provides additional circuit for brakes, battery, or reverse lights
  • Heavy-duty, 7-way, RV-style trailer connector is insulated and molded to protect terminals and wires
  • Weatherproof, corrosion-resistant 7-pole junction box protects wires, eases installation, and makes diagnostics simple
    • Ring terminals allow for easy connections
  • Wire loom protects wiring from the elements and allows wires in and out along any point of the loom for easy installation
  • Includes:
    • (1) 7-Way trailer connector
    • 1 Wiring junction box with mounting hardware
    • 8 Ring terminals for 12- to 10-gauge wire
    • 8 Ring terminals for 16- to 14-gauge wire
    • 10' Wire loom
    • 1 Self-tapping ground screw


  • Junction box dimensions: 7" long x 3-1/2" wide x 2-1/4" tall
  • Trailer connector length: 8'
  • Trailer connector wire gauges:
    • Black/white: 10 gauge
    • Blue: 12 gauge
    • Brown/red/green/yellow: 14 gauge
  • Wire loom dimensions: 10' long x 1/2" diameter
  • Ground screw: #8 x 1/2" long

Wiring Code
Molded Connector Function Usual Trailer Wire
White Wire Ground White Wire
Red Wire Left Turn and Brake Yellow Wire
Brown Wire Right Turn and Brake Green Wire
Green Wire Tail Lights Brown Wire
Blue Wire Brake Power Blue Wire
Black Wire 12 Volt (hot lead) Black Wire
Yellow Wire Auxiliary -

ET7WK Trailer Wiring 7-Way Upgrade Kit

Video of Trailer Wiring 7-Way Upgrade Kit

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for etrailer 7 Way Trailer Wiring Upgrade Kit Installation

Today we're going to show you how to install part number ET7WK. This is a 7-way trailer wiring upgrade kit. This is going to be great for taking care of from the vehicle to your junction box whether you're rewiring a trailer or just upgrading existing wiring. The first thing we want to do is just kind of roughly route the new 7-way into the area we intend to mount our junction box. I'm going to be doing mine right back here behind the A frame around the corner, kind of centrally located here in the middle of the trailer. What we're going to do is use a couple of self-tapping screws, get this mounted in location. I'll take off the long screws here in the front cover.

That'll expose all of our studs. What we'll do is pull out, see one of these plugs here, kind of have a softer center to it. I'll make a little slit in there. We want to pass our 7 pole wire directly through that, slide it on up the wire a little bit there. I'm going to slide that back in. We'll find out retainer.

We want to replace that right over our 7 pole and then get it threaded in there. We'll use that keeper to compress our 7 pole wire, holding it nice and securely. We'll start dividing our wires into the areas they're going to be connected to. Our white's going to be for our ground. Our black is going to be for 12 volt power. For my left side, turn signal and brake light we'll be using our red wire.

The blue wire, that's going to be for our stop signal. The brown wire, that's going to be used for our right side turning brake. Our green wire's for our taillights. Our yellow wire, we're going to run that down here. That's going to be auxiliary.

You'd use that for reverse lights if you we're going to do it on a marine application. On our trailer application here, we don't have this. We'll disconnected it so it has a home in case we ever need to add it. We can start trimming our wires back. We'll start adding on our ring terminals. At this point all we have to do is make our connections from our trailer wiring. You definitely want to start this project with healthy, working trailer wiring. We've got our caps. Just like before, make a small slit or small puncture in it. The wire's in. Now left side turn signal's going to be our yellow wire. We're going to connect that short red wire there. We'll put on a serrated washer. They also supply us the nuts we need. The next one is going to be our brown wire here. This one is our running lights. You can see it's kind of brown and yellow, kind of both. That needs to connect to our green wire. Remember that was our taillight circuit. We're going to leave that one open because we also need to pick up the other side. Auxiliary wire we can go ahead and put a nut on that one. We're not going to be reusing it. Take our other one. This one we're going to pass through out brake power and ground. We'll pass through our right blinker and taillight. I'm also going to pass through an additional wire. This is what we're going to use for our ground. Let's get all of our wires separated here. We'll put on another keeper just to hold those wires in place for us. Let's strip back our 2 white wires. These are going to be our ground wires. They'll go to the ground stud. Let's place on one of our locking washers and a nut there. We need to get our brown coming from our other side. That's going to go on the same taillight stud as we put the other one. Running lights stud . Our brown wire, that's for our right side turn signal. That's where our green wire needs to go. That's going to take care of both the turn signals and the brake lights. Finally we've got the 12 volt power lead coming from our brakes. We want to get that connected to our brake circuit. That pretty much is going to take care of everything that we need to do to operate the lights on our trailer and also the brakes on our trailer. Get everything neat and tidy. We can grab our cover and place that back on. We just need to get our ground wire, ground it out. We've got a stud right there that we'll use. We've got a ring terminal on there. We can just ground it right back out. There will be a stud provided with the kit. If you don't already have a stud located like this one, you can just use that to get it secured up. Let's check it out, make sure everything's working the way it should be. We've got everything hooked up. Let's run through our test. First we'll turn on our running lights and make sure that we've got lights where we want them. We'll turn on the left brake and blinker signal. Working fine there, now the right. Working fine there. We can spin the tire, engage the brakes and we want to see it lock up just like that. With everything working as it should, that completes our installation of part number ET7WK, the 7-way trailer wiring upgrade kit.

Customer Reviews

Trailer Wiring 7-Way Upgrade Kit - ET7WK

Average Customer Rating:  4.3 out of 5 stars   (21 Customer Reviews)

This kit contains everything you need to upgrade from a 4-way, 5-way, or 6-way connector to a 7-way connector. Includes 7-way RV-style trailer connector, junction box, wire loom, and hardware.


Easier said than done 557048


Good heavy duty cable. Didn't really care for the over-molded plug. The pull tangs are soft and make it difficult to pull from the receptacle. Junction box is very sturdy and has plenty of room for routing wires. 487302


Used this kit to upgrade the wiring on my utility trailer. The junction box is suitably rugged. I mounted it on the underside of my trailer bed near the tongue. This box easily allows me to wire up a battery to on my trailer for a winch or breakaway brakes and keep that battery charged via the vehicle. 575712


Three connection wires from truck (2017 GMC truck) did not match up with color connectors indicated in junction box. Perhaps GM is different than most? 514344


Because trailer wiring color codes arent always consistent, its recommended to wire by function, not by wire color. Plug the wiring harness into the vehicle, and use a circuit tester like # 40376
Circuit Tester Kit
as each lighting function is tested, then wire accordingly. For more helpful information about trailer wiring, click on the provided link.

-- Mike L - 05/31/2018



I just received my order, the order came very quickly and completely. Everything looks good. I ordered the Etrailer brand. The quality seems very good. 324513


Great service 369461


The weather tight box works great. The wire color from the 7 pin connector does not align with function of the trailer and the labels in the box. I had to remove the 7 pin connector for now and install a flat 4, it now works. I will have to check each colored wire when plugged into the vehicle to figure out what each wires does. Other than a color coding issue it works great. 720910


Excellent quality product, install was a little challenging when it came to the 7 spade cable wiring, when did LT yellow wire become red and yellow auxiliary. You need to include a simple diagram of the junction box and where the connections go. Other than wasting a few hours figuring out what was going on, it all went well. Thanks 674667


There is more than one accepted wire color code for trailer wiring. This is why we provide a wire color/function chart in the product description above.

-- Mike L - 07/26/2019



Hi quatily product. Professional Company Prompt delivery 663830


Can't wait to put these on! 644043


all is well everything working as should be thanks for the great service. 616686


worked great just wish they came a longer in length with this kit had to add 10' of 7 pin wire to it to reach junction box 605973


Got what I ordered , It all fit ,worked well. 522969


works as expected 521933


Good quality kit installed quick and ea sy. 513576


Great product,Great service and fast sh ipping. 468320


Thanks for fast delivery and great service. The videos were great to repair my Atwood coupler. I will be using you guys again soon. 456659


Great product. Came with everything I needed. Makes a great test point and junction box. Highly recommend! 455865


Little disappointed with this wiring kit. The plug colors did not match up correctly for standard wiring. I ended up having to pin it all out with an ohm meter and connector on the truck (Ford F-150) and then match it to the trailer. Would have been nice for this to use standard colors and it would have saved me 30min. 442691


I am very happy with the items I received, everything went together with ease. This was the first time I attempted installing brakes on a trailer, your videos made it very easy to choose the items I needed and assembling. I will recommend etrailer to my friends in the future. Thank you John C. 423007


I am very happy with the items I received, everything went together with ease. This was the first time I attempted installing brakes on a trailer, your videos made it very easy to choose the items I needed and assembling. I will recommend etrailer to my friends in the future. Thank you John C. 423006


Ask the Experts about this etrailer Accessories and Parts

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Cole B
Video Edited:
Chris R
Written by:
Amanda M

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