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 etrailer.com. 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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  • Why etrailer?

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.


Features:

  • 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


Specs:

  • 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.

- ET7WK
by:

Easier said than done 557048



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

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


Comments

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
$61.02
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

39115

- ET7WK
by:

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



- ET7WK
by:

Great service 369461



- ET7WK
by:

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



- ET7WK
by:

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


Comments

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

58258

- ET7WK
by:

Hi quatily product. Professional Company Prompt delivery 663830



- ET7WK
by:

Can't wait to put these on! 644043



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

works as expected 521933



- ET7WK
by:

Good quality kit installed quick and ea sy. 513576



- ET7WK
by:

Great product,Great service and fast sh ipping. 468320



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

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



- ET7WK
by:

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


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21

Ask the Experts about this etrailer Accessories and Parts

Do you have a question about this Accessories and Part?


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  • What is Needed to Add Electric Brakes to Utility Trailer?
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  • Is the Yellow Wire For the Reverse Lights On the 7-Way Molded Trailer Wire Connector H20043
  • In regards to the 7-Way Molded Trailer Wire Connector part # H20043, the yellow wire is for the reverse light circuit yes. This should then align with the pin responsible for the reverse light circuit on your vehicle. The terminology used for "AUX" is the same as the reverse light circuit. Please note, if you are rewiring a trailer I highly recommend you use a junction box, the Trailer Wiring Junction Box part # 3375601101 to keep everything organized. We also have the Trailer Wiring...
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  • Recommended Junction Box Installation For LED Lighting And Break Away Kit
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  • Parts Needed To Install Brakes On Haulmark 8 Foot V Nose Trailer
  • I did some research and it looks like most Haulmark trailers like yours have a 3,500-lb single axle. If you have different axles then let me know and I can make the correct recommendation.  Your axle must have brake mounting flanges attached behind the existing hub assembly on each side for brakes. If there are no brake mounting flanges then you will either have to replace your axle or purchase brake mounting flanges that can be welded to your axle by a qualified welder.  A common...
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  • What Parts Are Needed to Add Electric Brakes to a Trailer with a 2,000 Lb Axle
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  • I spoke with Knott AutoFlex Inc. and was able to get the needed information using the axle tag in order for you to add electric brakes to your trailer. I have attached a list of these parts below. Electric Trailer Brake Kit part # AKEBRK-35 Trailer Hub and Drum Assembly part # AKHD-545-35-K (2) Trailer Wiring 7-Way Upgrade Kit part # ET7WK If you don't already have a brake controller on your 2013 Toyota Tundra, I recommend the Draw-Tite I-Command Trailer Brake Controller part #...
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  • We have everything you'll need to tow your 2019 Toyota RAV4 FWD with the Roadmaster Tow Dolly # RM-2000-1. This dolly will work great too as it has more capacity than needed, brakes, and can steer. To convert the 4-way to a 7-way to operate the brakes you'll want the 7-Way Upgrade Kit part # ET7WK. This comes with a 7-way and a junction box to make the conversion as easy and clean as possible. The brake controller I recommend is the Prodigy P3 part # 90195 because this brake controller...
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  • Trailer Wiring Connection Needed for 2006 Lexus GX 470 with Connection Under Bumper
  • Thank you for the picture! It actually looks like you already have a 7-Way socket installed on your 2006 Lexus GX 470. If you check out the attached photo of the Hopkins Endurance Multi-Tow Twist-Mount 7-Way RV and 4-Way Flat Trailer Connector # HM40920 you can see how they are similar. My guess is that someone install the 7-Way at a weird angle either to try keeping your Lexus looking factory or because they didn't have a choice. You'll want to verify that the various functions work...
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  • Recommended 7-way Wiring Harness for Upgrading Trailer to 7-way by Adding Brakes and Reverse Lights
  • I recommend the # ET7WK junction box kit for your trailer. This kit includes a 7-Way trailer connector, a 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 foot of wire loom, and 1 self-tapping ground screw. You will also need an appropriate length of duplex wire # 12-2-1 to connect your brakes. The 7-way trailer plug # H20046 included in this kit will have the auxiliary wire that is used for reverse...
    view full answer...


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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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