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  4. Trailer Hitch Wiring
  5. 7 Round - Blade
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Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long

Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long

Item # A10-7W10
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Mighty Cord No Converter Custom Fit Vehicle Wiring - A10-7W10
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This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Durable molded rubber construction and corrosion-resistant terminals withstand the elements. 1-800-940-8924 to order Mighty Cord custom fit vehicle wiring part number A10-7W10 or order online at Free expert support on all Mighty Cord products. Guaranteed Lowest Price and Fastest Shipping for Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (62)
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  • Videos (2)
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  • Why etrailer?

Mighty Cord Custom Fit Vehicle Wiring - A10-7W10

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • No Converter
  • Mighty Cord
  • 10 Feet Long

This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Durable molded rubber construction and corrosion-resistant terminals withstand the elements.


  • 7-Way blade-style plug allows you to connect your trailer to your vehicle
  • Durable molded rubber construction
  • Corrosion-resistant terminals withstand the elements
  • Simple installation
    • Hardwire to existing trailer wiring


  • Harness length: 10'
  • Wire gauges:
    • Red, brown, green, and yellow: 14 gauge
    • Blue: 12 gauge
    • White and black: 10 gauge
  • Wiring configuration:
    • Yellow: auxiliary and reverse lights
    • Green: tail lights
    • Brown: right turn and brake lights
    • Blue: electric brakes
    • Black: 12V battery charge
    • Red: left turn and brake lights
    • White: ground
  • 1-Year warranty

A10-7W10 Mighty Cord 7-Way Blade-Style Molded Trailer Wire Connector - 10'

California residents: click here

Video of Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long

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

Video Transcript for Mighty Cord 7-Way RV-Style Trailer Connector Installation

Speaker 1: Today we'll be having a look at, and showing you how to install the Mighty Cord, 7 way RV style trailer connector. Part number A10-7W8. Now your cord can become damaged in many ways. Most commonly, you forget to unplug it when you uncouple from your fifth wheel trailer or your other type of trailer that you have, and it breaks off or tears. Something of that nature. Or it drags on the ground somehow when you're towing your trailer and it wears holes in the wire.

That's a good situation where you're justified replacing it.Now the replacement cord that we have here today is a molded design. What that means is that our connector is molded onto the cable end to help prevent moisture from getting inside. We have a total length of eight foot of wire to go to our junction box or our unions where our wires will meet the rest of the wiring on our trailer.This is an ideal replacement for broken, damaged, worn out, frayed connectors for your trailer. This will work with fifth wheel trailers, gooseneck trailers. Any trailer out there with a seven way connector, this will work for it.

This seven way connector is available in various different sizes to fit your needs or your application. It's super easy to plug in. Just line up the tab on the top of it, and slide it into your seven way on the back of your vehicle.Here's what it looks like installed in conjunction with a junction box. A junction box makes it easier for you to add replacement lights down the road, or to add additional lights or other features to your vehicle or trailer that can work off of your seven way connector. Now that we've gone over some features of our Mighty Cord seven way connector, we'll show you how to get it installed.

We're going to cut off our existing seven way wire past all the damaged section, making sure we leave enough slack in it to reuse our junction box.You want to make sure that you have your batteries disconnected on your trailer at this time if you have any. This is the junction box we're using. We're going to take our cord, measure a little bit less than the full length of it, and we will cut off the outer sheathing. Okay, once we have it cut all the way through, we can pull back the sheath, exposing our wires inside.Now, we'll open up our junction box. Now inside the junction box, you can see it's labeled with the corresponding colors.

You have your white, your black, your yellow, your red, green, brown and blue and the corresponding functions which are correct in most applications. But because we're just using this to combine our old seven way wiring with the new seven way connector, we'll just match them up by color.Now we'll take one of our grommets that comes with the junction box. Slide our wires through it. Make sure the sheathing goes inside of it. Take our junction box now, take out one of the knock outs, slide the grommet into that hole. Okay, now we'll secure the wire with a clamp and our provided screws and we'll tighten these down so the wire can't be pulled out. On our replacement seven way, I went ahead and cut off some more of the sheathing. I'll slide another one of those grommets over the wires and down onto the sheathing itself. We'll go through another hole and we'll clamp it in place just like we did the other one. Now I'll pull back and make sure it's secure.Now we can start stripping back our wires, cutting them to length, and matching up with the corresponding colors. We'll start with our blue ones first. We'll strip back some insulation from both blue wires and on each blue wire we will attach some small yellow ring terminals which we have available on our website, clamp them in place. Slide them over the stud for our blue terminal. Place on one of our star washers followed by a nut, and we'll tighten that down.We'll continue this process for all of our colored wires, matching them up color to color. All right, with them all secured and matched up properly, we now have a proper electrical connection and if we need to add any accessories later to our trailer such as extra lights, we can easily do it inside of our junction box.With all of our connections made, we'll put the cover on, resecure the screws and now we're going to mount our junction box up next to this other electrical box in our king pin box. We'll be using a couple self tapping screws to secure this. Just like that, with our screws installed, our junction box is secure, and is readily accessible in case you need to make any repairs or add any electrical accessories such as additional lights.Now that we have everything installed, we'll take our new plug and we'll plug it into a seven way in the back of a truck the test out all of our functions to make sure everything is working correctly. Okay, we'll start by turning our headlights on. See our taillight running lights are working properly. Do a left turn signal. That works. Right turn signal. That works. Step on the brakes. Those are working. While we're stepping on the brakes, we'll make sure our turn signals work correctly.That's all good. Everything is working properly. That completes our look at and showing you how to install the Mighty Cord Seven way RV style trailer connector, part number A10-7W8.

Customer Reviews

Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long - A10-7W10

Average Customer Rating:  4.9 out of 5 stars   (62 Customer Reviews)

This molded, 7-way, RV-style, trailer-end connector allows you to connect your trailer to your vehicle. Durable molded rubber construction and corrosion-resistant terminals withstand the elements.


The cord is of good quality and is working well. The reason for 3 stars is that the wire color to Pin location don't match the standards I have printed even ones I got with the car connector from etrailer. I just used an ohm meter to confirm which color wire connected to each pin before connecting to the trailer.


Great quality and the wires are very good quality and guage.


very happy with the items I got


The design and construction is very good. However I won't be able to install it until spring


The delivery was reasonably fast. The service tech, Nicolas C., with whom I talked and placed the order was very knowledgeable and pleasant.
The cable is for a 5th wheel travel trailer to a 3/4 ton pickup needed to replace the factory one-foot too short cable with a connector whose female metal connections had lost their temper and thus valid connections to distribute voltage and current from the truck to the brakes, batteries, and refrigerator.
The new cable seems to have solved the problem.
The etrailer site had good wiring diagrams and installing instruction for many types of trailers.


Perfect cable for our trailer.


Purchased this to upgrade the connection between my trailer and my truck. This cable has remained flexible and provided the length I wanted to be able to connect without hitching.


Works for what we needed.. use it all the time the camper is on the truck.


This was an exact match to the wiring of my 2009 forest river 27' salem toy hauler. I purchased the 10' cable which is 2' longer than the stock cable. I did that so I would have extra cable to add a new end to if I have troubles later on. The Product works perfectly after installation . My reason for the replacement was a failure of the stock plug end. No complaints about the stock one. It lasted 10 years which I believe is a good life span for any plug. This plug seems like with proper care and corrosion protection it should have a long life as well.


Thank you for your excellent service. I needed the wiring harness urgently overnight and Nicole in customer service made sure it would ship and get to me on time.


My old cord had 16 gauge wire for the brakes , This took care of my week trailer brakes.


Installed easy
And worked as designed



Replaced old cord with new one. Exactly what I wanted at a reasonable price. That is why I always check etrailer for parts I need on my RVs. the cord is durable and is exactly how it was explained in its description.


RV pig tail was delivered with the Truck harness in a timely manner. The quality of the product was very good and excellently made.


Still working.


Excellent above and beyond customer service!! The called the same day after we placed our order to let us know they hadn't received their shipment and swapped us products to get us what we needed right away! 5 days after a Saturday order and we have our products! Outstanding!! We will be sharing your name with friends and family!!


Direct replacement for my trailer cord. Like that it is sealed to keep the weather out.


Ordering and shipping on time was great. easy installment. Only draw back is the longer I pull my trailer the more the brakes apply pressure and I have to make adjustments to keep brakes from locking up. But I would and suggest buying to a friend.


Quality product, well built, durable and easy to install. Recommend a quality crimper or solder connections to the electrical box.


Works. Real tough to install. Terminal ends must be cut at exactly the correct length to fit in the junction box. Colors all matched up fine.


Works great for a conversion lance camper plug rubber coated plug good quality product


Work great onslide n camper still got it tks


This cord was a good length to replace the damaged cord on our travel trailer. It has a sealed plug connection thus eliminating the need to attach and maintain the RV-style plug on the end of the cable. This was an easy replacement.


High quality and perfect length


Easily added to my boat trailer works w ell

Show More Reviews

Ask the Experts about this Mighty Cord Custom Fit Vehicle Wiring

  • 7-Way Molded Trailer Connector with 10 Feet Length
    The Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long # A10-7W10 is what you are seeking. RV wiring is the same as regular trailer wiring as far as locations, just the wire colors differ slightly. I've attached an article to assist.
    view full answer...
  • Wiring Configuration of Mighty Cord 7-Way Plug A10-7W10
    For the 7-way trailer plug # A10-7W10 the wiring configuration is as follows: Yellow: auxiliary and reverse lights Green: tail lights Brown: right turn and brake lights Blue: electric brakes Black: 12V battery charge Red: left turn and brake lights White: ground The 12V power and ground wires (black and white, respectively) are heavier 10-gauge wire; the blue brake circuit wire is 12-gauge and all lighting circuit wires are 14-gauge.
    view full answer...
  • What are the Correct Wiring Connections Between the Trailer and the Tow Vehicle
    I have attached a wiring diagram that will show the typical arrangement of the towing wiring on your vehicle and the corresponding wires on the trailer side. The basic wiring identification is as follows: Green - Tail & Running Light Black - 12V Power Brown - Right Turn and Stop Blue - Brake Control Output White - Ground Red - Left Turn and Stop Yellow - Reverse Lights I also attached an article on trailer wiring that can give you more info for you to review.
    view full answer...
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  • What are the Different 7-Way RV Wiring Configurations
    There are two different styles of 7-way wiring typically seen. Traditional and RV Standard. The pins all have the same functions but the difference is the wire colors. If you check out the picture I attached you'll see the two different versions in the left and center diagrams. The 7-way part # A10-7W10 that you referenced uses the RV standard style.
    view full answer...
    Image 1 for
  • 7-Way and 10 Foot Wiring Harness Recommendation for Airstream Flying Cloud
    The Mighty Cord # A10-7W10 that you referenced is a great option for you. This connector and lead is made from really high quality materials that will last you a long time. The wiring also has heavier gauges of wire than other options too so it wins in that department as well.
    view full answer...
  • Solution to Replace 8-Pin Connector on Older RV
    What you are looking to do is technically possible but the corrosion you are trying to prevent would still be an issue if the conditions were correct for it. The problem is that either way there is going to be metal connectors that would be exposed either on the 7-way or the wires that attach the harness to the 7-way so the opportunity for corrosion wouldn't be eliminated. On the trailer side you could use the part # A10-7276VP and then on the vehicle side # HM47210.
    view full answer...
  • Trailer Side Wiring For Hopkins 7-Pole and 4-Pole Trailer Connector 7-Way Plug
    The Hopkins 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring part # HM40975-11998 does not include the wires from the connector to the trailer. The Hopkins will give you a 7-way plug on specific vehicles with a bundle of wires at the rear near the bumper from the factory. The long pigtail with different colored wires you see in the photos will connect to the factory bundle of wires. Once you have the 7-way plug installed on the vehicle you can use a trailer end...
    view full answer...
  • Replacing Molded 7-Way, Junction Box, and Breakaway Kit on Trailer
    If you have a 7-Way and junction box setup on your the trailer your easiest route will be to just replace the junction box with something like the Epicord 7-Way # 277-000141. This harness features a 7-Way molded plug and pre-wired junction box with terminals so that you can simply make connections to what remains of your trailer wiring after removing the connector. I have attached an installation video so you can see exactly how everything hooks up. The wire color/functions for the harness...
    view full answer...
  • Replacement 7-Way RV Harness in Different Lengths
    There are various lengths of 7-way RV harnesses but they have 10 gauge white and black wires for the positive and negative connections. The 7-Way Molded Trailer Wire Connector - 3' Long # H20042 for example uses 10 gauge wires for positive and ground, 12 gauge wire for brake controller, and 14 gauge for the other functions. The Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long # A10-7W10. The same wire gauges line up for the vehicle side like the Pollak...
    view full answer...
  • Installing Reverse Lights on Trailer Using 7-Way Connector and Wishbone 4-Way Wiring Harness
    Using the Mighty Cord Wishbone 4-Way Flat Trailer Connector - Trailer End - 25' # A10-4225VP will give you the wiring for the tail lights on each side of your trailer giving you both the running light for each side and then the stop/turn function for each side. The ground wire will connect to your trailer frame on a bare metal to metal surface. Then when using the Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 10' Long # A10-7W10 or similar based on length,...
    view full answer...
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  • How to Rewire Vintage Trailer with 7-Way Connector and Parts Needed
    Most of us aren't electricians, but that doesn't mean wiring a trailer is beyond us. It will take a little bit of time, but I wouldn't consider it a difficult DIY project by any means. So, to wire your 1977 Serro Scotty vintage camper, I recommend using the following parts: - Mighty Cord 7-Way RV-Style Trailer Connector # A10-7W6 (6 ft long) - this is a high quality molded trailer connector with corrosion resistant terminals. - etrailer Trailer Wiring Junction Box - 7 Terminal # e99009 ...
    view full answer...
    Image 1 for
  • Why Do Some 7-way Plugs Use Dual Contact Surfaces
    A 7-way (female) vehicle socket like # PK12-707E has a single blade contact; these fit in between the dual contact surfaces in a (male) trailer plug like # 54006-059, # 277-000143 or # A10-7W10 and the connector (type BB) shown in your photo. Some 7-way male plugs will use a single blade contact, such as the plug on Hopkins 7-way extension # HM20049. This item's female socket and male plug happen to both use the single contact. Both types are compatible with each other. The Bargman Double-Ended...
    view full answer...
    Image 1 for

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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Joshua S
Video by:
Joshua S
Employee Cole B
Installed by:
Cole B
Employee Brent H
Installed by:
Brent H
Employee Chris R
Video Edited:
Chris R
Employee Mary E
Updated by:
Mary E
Employee Halie H
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