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etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector

etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector

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This kit includes a junction box so you can quickly and easily connect the wires from the included trailer connector to your trailer's wiring. Lowest Prices for the best trailer wiring from etrailer. etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector part number e99011 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (132)
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  • Why etrailer?

etrailer Trailer Wiring

  • Trailer Connectors
  • Junction Box
  • Trailer End Connector
  • 7 Round - Blade
  • Plug and Lead
  • 0 - 5 Feet Long
  • etrailer

This kit includes a junction box so you can quickly and easily connect the wires from the included trailer connector to your trailer's wiring.


Features:

  • Kit allows you to upgrade from a 4-way, 5-way, or 6-way connector to a 7-way connector
  • Pre-wired, 7-way, blade-style, trailer-end connector lets you connect your trailer to your vehicle
    • Flexible cable allows for easy positioning
  • Weatherproof, heavy-duty plastic junction box protects wires and terminals from the elements
  • Wire functions:
    • Black: 12 volt power
    • Yellow: auxiliary or reverse signal
    • Red: left brake and turn signal
    • Green: running lights
    • Brown: right stop and turn signal
    • Blue: trailer brakes
  • Ring terminals included


Specs:

  • Overall box dimensions: 8-1/8" long x 3-3/8" wide x 2-3/8" tall
    • Distance between mounting holes (on center): 7-3/8"
  • Lid dimensions: 6-5/8" long x 3" wide
  • Cord dimensions: 60" long x 5/8" diameter


e99011 etrailer Trailer Wiring Junction Box with Plug - 7-Way

Item # e99011






Customer Reviews

etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector - e99011

Average Customer Rating:  4.8 out of 5 stars   (132 Customer Reviews)

This kit includes a junction box so you can quickly and easily connect the wires from the included trailer connector to your trailer's wiring.

- e99011
by:

Seems like a good way to rewire a trailer. Unfortunately this didn't include the 2 screws to secure the lid of the junction box. Not sure if 8t was just my package that was lacking or if they are all that way. Defeats the entire purpose of all the weather tight connections to the box. Without the correct size screws the plastic box will strip out easy rendering it useless.


Comments
I will have our customer service team reach out to you. The screws are included to secure the lid to the junction box.
-- Etrailer Expert Jenny N - 02/16/2022


- e99011
by:

So far both the wiring harness and junction box kit are working well. Comes with loop connectors and grommets and has a small layout describing the functions of each wire. Would be nice if a diagram was included to match the wires from the trailer to the box since none of the colored wires match up, luckily [online videos] can fix that. I would recommend purchasing, its a good deal and not difficult to install.



- e99011
by:

The molded plug & sealed junction box is a 5 star upgrade. My old open plug would rust & the lights not work after a short time.


Comments
No problems at all. The sealed plug and junction box solved my moisture and corrosion problem. Thanks for a great upgrade to my trailer.
Michael - 04/16/2022


- e99011
by:

This is great kit for updating plugs on trailers with brakes. It is so convenient to be able to check power at this junction box. I have installed these on several trailers and I like them a lot. etrailer is the by far the best place to get them, great price, fast shipping, super customer service. Herald



- e99011
by:

Arrived fast and packed well, plugged it in and everything tested out Ok. I will add my wiring tomorrow. I will buy this again if I get another trailer.



- e99011
by:

The next best thing since sliced bread in trailer wiring. After using this the first time I've put one on any trailer I've had to do wiring work on. I've also used one on my pickup as a junction box that has worked much better and easier to add to or change out components than most "factory" T connections. Don't have intermittent issues with loose pins on plugs like the "t" splitters tend to have. 10/10 will purchase again and have already recommended it multiple times to friends/family.



- e99011
by:

This originally worked well and was straightforward to install. I recall one of the colored posts not matching standard colors, but it wasn’t an issue. I had to shorten the 7 way lead. The plastic got brittle in the winter cold and I accidentally broke it at some point. I ended up replacing it with something made of a different kind of plastic. If I were to do it again, I probably wouldn’t put anything like this on another trailer. Probably better for a gooseneck or fifth wheel.



- e99011
by:

Product is exactly as described. The quality is exceptional, delivery of the product was in a timely manner. The customer service at etrailer is awesome!



- e99011
by:

Overall the parts are great, the only reason I give it a 4-star rating because I think they could have sent some smaller terminals, the one comin with the kit is over sized for the 10-14 gauge cables most people use.



- e99011
by:

This what I have been looking for. Makes a neat junction box hidden under trailer.



- e99011
by:

Great product, the wires in the receptacle were wired wrong as well as the instructions were wrong. Brown is running lights, green is right turn and brake, yellow is left turn and brake. I adjusted the wires in the box and all was good.



- e99011
by:

Order was left on the ground outside my front door in a snowstorm on a Sunday. I'm not open on Sundays. Picked up the soaked box on Monday morning.



- e99011
by:

WORKED VERY WELL WITH WIRING UP THE ELECTRIC ON MY TRAILER.



- e99011
by:

This is the 5th one I’ve bought for five different trailers they make for an easy professional looking installation



- e99011
by:

This is perfect for the upgrade to my 16 ft trailer lighting that will work on our new 2021 Ram



- e99011
by:

I was rewireing a 12’ box trailer and purchased all my wire ring needs thru etrailer : They were very courteous and professional all parts and equipment were good quality and just as I ordered it :) I am very happy and satisfied:



- e99011
by:

Looks like a good product I have yet to install it tho I like how everything is color coded it will make it easy to install



- e99011
by:

Great product, easy to install I didnt have instructions, but used the etrailer you tube videos. I could not have done it without the videos. Works perfect a year later!



- e99011
by:

Fast Shipping as always! Can't wait to install once the weather warms up.



- e99011
by:

All are great products



- e99011
by:

Very high quality, could use better packaging! The box was ripped open when delivered, due to a very flimsy box!



- e99011
by:

Well informative people. Quick deliveries and great customer service. Have used them several times. Great results. Always



- e99011
by:

Looks great. Didn’t install it yet but it should do what I need.



- e99011
by:

Good Quality and easy to install



- e99011
by:

Thanks for getting it out quick. It is well made And I like the color coded terminal it make it easy to know what wire goes where thank you.


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Show More Reviews

Ask the Experts about this etrailer Trailer Wiring



  • Replacing a 7-Blade to 6-Square Trailer Adapter on a Pop Up Trailer
    What you have is an adapter that goes from a 7-way blade connector to a 6-way square connector. A few pop up trailer manufacturers used it but unfortunately replacements can be hard to find. In my opinion you would be better off cutting the 6-way off of the trailer and just hardwiring in a 7-way connector and not deal with the adatper. The easiest and cleanest way to wire in the new 7-way is with a junction box. We have part # e99011 that includes everything you need. I've also linked...
    view full answer...
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  • Kit to Upgrade 5-Way on Trailer to 7-Way
    We have a kit that's designed for exactly what you are looking to do. The Trailer Wiring 7-Way Upgrade Kit part # e99011 is designed for upgrading a trailer from a 4-way to a 7-way but can also be used with 5-way wiring as well very easily. I attached an install video for this kit for you to check out as well.
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  • Trailers Right Blinker Light Causes Both Lights to Blink
    Checking the grounds first was the right thing to do since what you're experiencing is generally a ground issue. Since you've already done that you might replace the mounting hardwarwe for that light to see if the issue is still a ground. Also, do the same work on the main trailer ground if you haven't already. Have you towed a different trailer with the same truck or tested the connector at the truck? If not you should just to make sure the problem is on the trailer side. Make sure...
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  • Troubleshooting New Trailer Brakes that Dont Engage with Multiple Trucks
    You know the brakes themselves work because you can test them with a battery. It sounds to me that the issue is in the trailer's connector or the wiring. I would try replacing the connector with something like # e99011. You can try testing for the problem in the connector by plugging the trailer into a truck and then using a tester on the brake wire on the 7-way just a few inches behind it.
    view full answer...
  • Upgrading 4-Way of Trailer to 7-Way to Wire Battery for Powering Trailer Interior/Exterior Lights
    For what you are looking for the standard solution that is tried and true is to install a vehicle battery in the trailer to power the lighting of your trailer. What you'll want to do for the trailer wiring is install the junction box 7-way kit # e99011 this is specifically designed for upgrading a trailer like yours from a 4-way to a 7-way. If you check out the picture I attached you'll see what the junction box does basically. The ring terminals on the bottom side of the posts are from...
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  • Which Axle if only one Should Have Trailer Brakes on Tandem Axle Trailer
    We recommend putting the brakes on the axle that will have more of the cargo's weight on it. For a utility trailer that's typically the front axle. Typically the only time you see the brake axle as the rear axle is if it's a boat trailer since the weight of the engine is behind the axles.
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  • Wire Function to Replace a Trailers 6-Way Connector with a 7-Way
    Are you trying to replace a 6-way on a trailer with a 7-way connector, like part # e99011? Traditionally, the white, brown, green, and yellow wires are as you listed them. Then the other 2 wires are for electric brakes and a 12 volt auxillary circuit. However, wire coloring is not always standard and can be very unreliable. Instead I recommend testing each circuit for function. Use a 12 volt battery and connect the negative pole to a good ground and then connect each wire, one at a...
    view full answer...
  • Replacing a Trailers 6-Way Connector with a 7-Way Connector
    The easist, and most sure way to know which wire is which function is to provide power to them, one by one, and see what happens. Wiring by function is unreliable because even though there is a traditional wire color code it isn't standardized by any means. Once you have found the functions of each wire you wan the pins on the new 7-way to be in the following pattern: 1 O'clock - Tail and running lights 3 O'clock - Left turn and right brake lights 5 O'clock - Ground 7 O'clock - Brake...
    view full answer...
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  • 7-Way and Junction Box Kit Recommendation for Trailer with 4-Way
    I'd go with adding a junction box and a 7-way but still using your current light's wiring if it's still good. For that we have the part # e99011 which matches what you need perfectly. It's designed for upgrading a trailer with a 4-way to a 7-way and comes with a junction box and 7-way. I attached an install video for this for you to check out as well.
    view full answer...
  • Parts Needed to Add 7-Way to Trailer to Power Trailer Interior Lights
    You'll have to convert the trailer to a 7-way so that it will have the 12 volt accessory circuit which will allow you to power the interior lights. The part # e99011 is designed for exactly what you are looking to do so it would be the best option for adding the 7-way. You'll want to run a length of wire from the junction box for the 12 volt circuit to the interior lighting as needed.
    view full answer...
  • Wiring Diagram for Installing etrailer Junction Box Upgrade to Utility Wiring Colors
    The only version of the etrailer wiring 7-way upgrade kit part # e99011 that we offer is this one that has the RV wiring colors. The best solution I can provide to help with that is a wiring diagram that has both color setups for you to compare and use when installing this.
    view full answer...
    Image 1 for
  • Can 7-Way Upgrade Kit w/ Junction Box e99011 be Used on Utility Trailer
    Yes the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector # e99011 will work great on a utility trailer. The 7-way blade connector it has is typically referred to as an RV style connector but it's more and more getting used on utility trailers. There's no reason at all it couldn't be used on a utility trailer. Most trucks have the 7-way connector that this matches to. Some say there's a utility and RV style 7-way but in reality the only difference is the color...
    view full answer...
    Image 1 for
  • Connecting a Vehicle with a 7-Way Trailer Connector to a Trailer with a 6-Way
    Replacing the 7-way connector on the trailer is the best route. This way you'll know exactly how it's wired. I recommend testing each wire by connecting it to a 12 volt battery as you're making the connections. It also may be easier to make the connections using a junction box and out # e99011 kit.
    view full answer...
  • Kit Needed to Convert 4-Way of Trailer to 7-Way
    We have a kit that is designed specifically for converting the 4-way of a trailer to a 7-way. For that you would want the 7-Way Upgrade kit part # e99011 which comes with everything needed. I attached an install video for this kit for you to check out below as well.
    view full answer...
  • How To Wire Up the etrailer Trailer Wiring 7-Way Upgrade Kit
    In regards to the etrailer Trailer Wiring 7-Way Upgrade Kit part # e99011, the terminals are actually labeled for you so it does not matter what color the wires are used with the junction for either side, just be sure to match by function and not color which any experienced technician should know to do. I have attached the wire color function chart of the junction box below. This is actually a standard known as "RV" but most trailers nowadays use "Traditional" I'll admit. 12 Volt Power...
    view full answer...
  • Junction Box to Improve Wire Connections on a Trailer
    The junction box # 38656 is for exactly what you're trying to do. It makes the wiring look a lot cleaner and keeps the connections out of the way. You also need some ring terminals to make the connections. I've linked our selection so you can choose the size you need. Another option we carry is part # e99011 that includes the junction box with a 7-way and all the ring terminals you need.
    view full answer...
  • Troubleshooting Pop-Up Camper Trailer with Non-Functioning Lights
    Since you are now dealing with troubleshooting trailer wiring you are no longer a novice! The best way to go is to isolate the problem to either the vehicle or the trailer. If no lights at all work on the trailer then this makes me suspect the vehicle wiring is not activated. Some vehicles may need fuses or relays installed to activate factory or aftermarket wiring. Without knowing your vehicle details the best suggestion I can make is to get a circuit tester like # 40376 and apply it...
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  • Troubleshooting Trailer Wiring on 2014 Dodge Ram 1500
    It would be unusual for all three relays in your 2014 Dodge Ram 1500 (or any other vehicle) to all go bad at once. If this did happen I would suspect the vehicle or trailer wiring/connectors. It is possible for internal corrosion to build up that could cause a short-circuit. This can occur on the visible parts of the sockets or plugs but it can also develop on the inside of these connectors, where it is very hard to spot. With enough exposure to the elements the trailer socket or plug could...
    view full answer...
  • How Does Trailer Battery Normally Wire to Trailer
    You'd only need to run the battery to your trailer wiring if the goal was to put a maintenance charge on the battery as you tow. If you only wanted to power accessories with the trailer it would not be needed and you'd just have to run the trailer accessories to the battery and you'd be done. A 4-way connector would not have a 12 volt charge circuit that you could run to a battery anyway and you'd have to convert that to a 7-way with the 7-way conversion kit # e99011.
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  • How to Wire a Car Dolly for Electric Brakes
    If you will be adding electric drum brakes to your car dolly then you will need to install a 7-way trailer connector. For this, I recommend using the Trailer Wiring 7-Way Upgrade Kit part # e99011. I have attached a photo which displays how the wires will need to be ran on the trailer connector. In addition to the new trailer wiring harness you will also need braking assemblies, hubs/drums, a breakaway kit, and a brake controller. If you would like for me to recommend any of these parts...
    view full answer...
    Image 1 for
  • Why Do 4 to 7-Way Trailer Connector Adapters Have Missing Pins Inside the 7-Way Plug
    In order to convert a trailer from a 4 or 5-way flat to a 7-way round you will need to use the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box part # e99011. The reason for this is because 4-way or 5-way flat trailer connector only carry circuits for stop/turn, running, and sometimes reverse lights. The 7-way has all of these circuits as well a brake output and a battery charge line.
    view full answer...
    Image 1 for
  • 7-Way Plug Mount for Trailer to Secure Connector When Not in Use
    Sounds like you are looking for a clip/mount for your trailer to put the 7-way when not connected to the tow vehicle. For that we have the part # 118152 which would work well for this. Normally people zip tie this around the trailer jack tube and set the connector in it.
    view full answer...
  • Easier Way to Wire in a 7-Way to a Trailer that Has 6-Way
    The easiest way to upgrade a trailer to a 7-way or wire in a new 7-way would be with the 7-Way upgrade kit part # e99011. The junction box mounts on the trailer and then all of the wiring then runs to the box and you're set. You wouldn't want or need to also run a 4-way harness to it as well. If a trailer needs the 7 circuits to function there wouldn't be a way to tow it with just a 4-way.
    view full answer...
  • How To Replace a 4-Way Trailer Connector with a 7-Way Trailer Connector
    The best option we have for you to upgrade the 4-way trailer connector on your trailer to a 7-way trailer connector is with the Trailer Wiring 7-Way Upgrade Kit part # e99011. Once you have this all you need to do is run the wires from the trailer lights to the junction box and then from the junction box to the trailer connector. Inside the junction box, the terminals are labeled by both wire color and function. However, when running the wires from this trailer connector to the junction...
    view full answer...


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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Eric H
Updated by:
Eric H
Employee Carrie F
Updated by:
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Employee Jonathan Y
Video by:
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Employee Clayton O
Test Fit:
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