1. Wiring
  2. Optronics
  3. Trailer Connectors
  4. Trailer End Connector
  5. 7 Blade
  6. Plug Only
7-Way Round RV Style Trailer Connector - Trailer Side

7-Way Round RV Style Trailer Connector - Trailer Side

Item # A7WCB
lowest price pledge
Our Price: $7.83
Wiring
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.18 lbs
Quantity: 
In Stock
Optronics Trailer Connectors - A7WCB
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

7-Way round plug lets you connect your trailer to the 7-way round blade connector of your tow vehicle. Interlock system keeps connections in place. Over-sized finger grips for secure disconnections. Durable ABS plastic housing. Lowest Prices for the best wiring from Optronics. 7-Way Round RV Style Trailer Connector - Trailer Side part number A7WCB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (148)
  • Q & A (120)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Wiring - A7WCB

  • Trailer Connectors
  • Trailer End Connector
  • 7 Blade
  • Plug Only
  • Optronics

7-Way round plug lets you connect your trailer to the 7-way round blade connector of your tow vehicle. Interlock system keeps connections in place. Over-sized finger grips for secure disconnections. Durable ABS plastic housing.


Features:

  • 7-Way round plug lets you connect your trailer to the 7-way round blade connector of a tow vehicle
  • Interlock system locks in place to keep connections secure
  • Over-sized finger tabs allow you to easily grip the plug during disconnections
  • Adjustable insert tightens against wires to limit exposure to dirt, dust, and water


A7WCB Optronics Replacement 7-Way Round RV Style Trailer Connector - Trailer Side

Alternate part: A-7WCB




California residents: click here


Video of 7-Way Round RV Style Trailer Connector - Trailer Side

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




Video Transcript for Optronics 7-Way Round RV Style Trailer Connector Installation

Today on our trailer, we're going to be installing the 7-Way Round RV Style Trailer Connector, part number A7WCB. Now to begin our installation, we'll go ahead and remove the set screw here on our 7-way connector to remove the inside. We'll then go ahead and remove the white sleeve that will be used to hold the connector in place on our 7-way wire. We'll now take our 7-way wire connector cover, slide it over our black 7-way round sheathing. We'll now go ahead and cut the sheathing off of our 7-way wire to expose the seven wires within it. We'll then strip away the insulation from each of the seven wires and connect them color for color as indicated on the 7-way plug.

Now here before we connect the last two wires on the round, we'll need to connect the yellow wire into our center post. We'll do this before we do the last two wires, just to give us a little more space to get the yellow wire in place. Now with all our wires secured into the connector, we can bring the cover back over and screw down the set screw. We'll then move to the white clamp here on the connector, and reinstall it. With that tight, our connector's on, and we're ready to hook up to our tow vehicle.

And that completes our installation of the 7-Way Round RV Style Trailer Connector, part number A7WCB.


Customer Reviews

7-Way Round RV Style Trailer Connector - Trailer Side - A7WCB

Average Customer Rating:  4.8 out of 5 stars   (148 Customer Reviews)

7-Way round plug lets you connect your trailer to the 7-way round blade connector of your tow vehicle. Interlock system keeps connections in place. Over-sized finger grips for secure disconnections. Durable ABS plastic housing.

- A7WCB
by:

High quality, easy plug and unplug acti on. 568664



- A7WCB
by:

I know it is just a trailer connector But! The great part is Etrailer's ability to get me the part, sell it to me at a good price and deliever it on time and with good packaging. That is why I buy from Etrailer and not the other guys! 208760



- A7WCB
by:

Used this as a plug for my portable 12V air compressor to facilitate access to power, rather than clips to battery. As usual, over the past several years etrailer is my go-to store for all trailer & towing needs. Excellent variety, price and prompt service. Keep up the good work.............. 352311


Comments
We installed the lights on a trailer we were selling. Installation went smooth, lights worked great.We install the trailer plug on a 12V compressor so we could power it from our trailer hook up and it works great also. You are our go-to trailer supply store.
RW - 03/13/2018

35860

- A7WCB
by:

Worked great. Updated my 1989 Lance truck camper fitting with this and had no problem with the install. Thanks Etrailer. 894249



- A7WCB
by:

894200



- A7WCB
by: 08/20/2020

865556



- A7WCB
by: 08/11/2020

860248



- A7WCB
by:

Thanks 859317



- A7WCB
by:

857469



- A7WCB
by:

Very good product. Just what I needed. Works great. 854218



- A7WCB
by:

Excellent service and price. Product shipped the same day as ordered. Price was very reasonable and the detailed pictures helped me order the correct unit the first time. We definitely recommend and will return in the future if needed. 852044



- A7WCB
by:

Service was excellent and the shipping was extremely fast!! 791528



- A7WCB
by:

We have several trailers and need to replace these all of the time. The price was so good, I ordered extra just to have them in stock. Fine product great price! 729528



- A7WCB
by:

good quality for price - very happy !!!! 703103



- A7WCB
by:

The part came in on time and is working as desired and at a great price. 688525



- A7WCB
by:

One year later, no problems, satisfied 688237



- A7WCB
by:

Straight forward design and easy to wir e! 674449



- A7WCB
by:

Great product & great website for information. Was able to install a round connector on a Thule lights bar ((for a bike rack) that replaces a horizontal connector that is used in another country (Australia). Would have cost a lot for an auto electrician but cost $6.00 all up to do it with eTrailers product & info. Thx!! 672350



- A7WCB
by:

They kept me updated on my order bc it was delayed a bit. Was very pleased with the updates and the concern they had for my small order. Excellent company, will continue doing business with them! 669340



- A7WCB
by:

Plug was exactly what I needed/ordered. Product was delivered two days ahead of schedule. can't think of anything more to say other than these folks WILL get my follow on business. Thank you etrailer for your prompt and correct service! 665147



- A7WCB
by:

The only reason I do not give you 5 stars is because your web site. When internet ordering, it should instantly state when a part is out of stock. Even nicer would be expected restocking dates. The parts received were exactly what I ordered for my electric brake conversion from surge brakes at far less expense than reparing the internally rusted surge brake system. There was a plethora of information on your web site to assist me in ordering the correct parts for the conversion. Plus there were videos to see how to complete the conversion and how parts were installed and adjusted. Customer service was excellent. 659636



- A7WCB
by:

Worked as described, very solid product, easy to connect. 654577



- A7WCB
by:

Great Products at a great price along with great shipping!!!!! Wish I could give 6 stars!!!! 653659



- A7WCB
by:

Works great! 641085



- A7WCB
by:

Nice plug 637677


25
148
Show More Reviews

Ask the Experts about this Optronics Wiring

  • Brake Controller Has Power But Trailer Brakes Do Not Work
    There are some tests you can do to determine where the problem is: brake controller, truck, or trailer. First, in the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # 40376 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override or brake pedal. If it shows power at idle then there is something wrong with the controller and it will need to...
    view full answer...
  • Installing 12V Power On Ford F-150 7-Way Trailer Connector
    You do not need to connect the 12V power connection on your F-150 7-way. That power is only required if you want to charge a trailer battery while towing or if you are using an electric device on your trailer like a powered sway control or wireless brake controller. It is likely that a fuse or relay needs replaced for the factory function if it was recently interrupted. I recommend checking your owner's manual for fuses and relays associated with this function. If you want to add that...
    view full answer...
  • Connecting 5 Wires From a Trailer to a 7-Way Trailer Connector
    The best solution for your situation would be to use a circuit tester, like part # 40376, to wire your trailer wires to a seven way trailer connector, like part # A7WCB. Wiring by function is the best way to make sure you have the trailer connector wired correctly. Be sure you know what the black wire function is on the trailer. It will probably be for a twelve volt battery or for reverse lights, but it could be used for something else. The location for the black wire in the connector...
    view full answer...
  • Does 12V Pin on 7-way Trailer Connector Always Have Power
    It sounds like you're asking about the 12V circuit on the 7-way trailer connector on the rear of your 2003 Chevrolet Trailblazer. Some vehicles will always have power and some others will not. We don't have this specific information for your vehicle, but to determine if your 12V always has power you can test the pin in the 1 O'clock position on your 7-way. The other pins will have power when the corresponding light is used or the brake pedal is pressed.
    view full answer...
  • How to Wire a Replacement 7-Way for a Gooseneck Trailer
    7-Way connectors like the # A7WCB that you referenced should be wired by function and not color. Since trailer manufacturers can sometimes use non-standard color wires for the taillight functions of their trailer it is best just to determine the function of each wire from your trailer's wiring and then wire it by function to the 7-way you end up getting. What you can do to determine the function of each wire is use a 12 volt battery like a car battery and run a jumper wire from the positive...
    view full answer...
  • Wiring Options for an Electric Winch Powered by an Additional Battery
    The easiest way to wire the battery for your winch will be to use the 7 way connector on your vehicle if you have one on your 2006 GMC Truck. You can get a 7 way trailer connector like part # A7WCB and use the Jacketed 2 Wire, part # 10-2-1, to connect a wire for the power and a wire for the ground in the connector. You will then run the ground wire, or white wire, to the negative terminal on the secondary battery and run the power lead, black wire, to the positive terminal on the battery....
    view full answer...
  • How to Connect a Trailer-Side 7-Way Blade Connector # A7WCB to a Trailer With 5 Wires
    We offer a trailer-side 7-way blade connector that can be attached to the 5 wires on your trailer, part # A7WCB from Optronics. The linked video illustrates how this part installs. Since your trailer has only 5 wires some of these pins will not be used. I have attached a photo showing both sides of a trailer connector with notations for a typical wiring configuration by function and color. Although these pin assignments are typical there is no guarantee that your trailer is wired the...
    view full answer...
  • Trailer Wiring Diagram for a 7-Way Trailer Side Connector
    The problem that you are going to run into no matter what 7-Way you want to put on your trailer is that the color of the wires used is not standardized. Trailer manufacturers or people who rewire their trailers at any point can use any color they have laying around. You have to go by function, and then follow our wiring FAQ diagrams which I have linked for you. The colors that we mention are the most used but are by no means definitive. If your old 7-Way is still attached you can just...
    view full answer...
  • Is Trailer Battery Being Able to Backfeed to Truck Battery a Problem
    In order for your truck battery to be able to charge your trailer battery it will have to have a connection to it that is going to have voltage like you tested. What you have is normal and the only possible downside would be if your trailer battery is basically dead and your truck battery ends up draining itself (if left connected for a long time) trying to charge it. When two batteries are connected they will seek to equalize the voltage between them. Some truck 12 volt accessory circuits...
    view full answer...
  • Will 12V Blade On 7-Way Charge A Camper Battery or Refrigerator While Driving
    For the battery, you can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part # 10-1-1 from this pin to the positive terminal of the battery. This won't charge a dead battery, but it will keep the battery topped off when you are towing the trailer. Because the power draw from your refrigerator will not be sufficiently covered...
    view full answer...
  • Wire and Function In A 7-Way Connector To Allow Brakes To Release When Backing Up A Boat Trailer
    The fifth wire that allows you to back up a boat trailer is the reverse function. Sending signal from the reverse function will allow the solenoid to disengage the surge brake function electrically. The reverse function is found in the center of the 7-way connector. I've attached a diagram to help.
    view full answer...
  • How to Wire up the Optronics Trailer 7-Way A7WCB
    It is hard to say exactly how much of the black wire insulation was cut off of the 7-Way Round RV Style Trailer Connector # A7WCB, but after watching the video and having done this myself before, it looks like Rick cut off about 2 inches of the black portion and then about 3/8 of an inch of insulation per wire. There is an industry standard for how 7-ways should be wired. If you check out the picture I attached you will see how they are typically wired. By function is how the connector...
    view full answer...
  • 7-Way Plug Recommendation for Replacing 4-Way of Hitch Light Fixture
    What you described is a very good idea. You could just cut off the 4-way of the light and then wire it to the part # A7WCB and you'd be good to go.
    view full answer...
  • How To Hook Up Utility Trailer Lights To Trailer Connector
    Yes, it is possible to power a flood light via the battery charge line on the trailer connector. The battery charge line is already fused so all you would need to do is run a power wire part # 10-1-1 from the back of the trailer connector to the light. That said, you would probably want to be able to turn the light on and off at your leisure so you would also want to install a switch part # PK34212 on the power wire from the trailer connector to the light. The light would then need to be...
    view full answer...
  • Trailer Left Side Brake, Turn Signal, and Running Lights Not Working
    Since everything is working on the truck side the issue must be on the trailer side. I have included a picture that shows the pin functions of both a vehicle and trailer side 7-Way. You will need to check the configuration on the trailer side to determine if it matches up to what the truck side has. In the pictures though you have to ignore the colors and focus only on the functions. On the vehicle side if you are looking at the pins the left turn signal and brake lights are in the 9...
    view full answer...
  • Will 7-Way Trailer Connector on Trailer Side Wiring Diagram Match a 2015 F-250 Factory 7-Way?
    The wiring diagram for the Optronics 7-Way Round RV Style Trailer Connector - Trailer Side, when installed correctly will match a factory 7-way system or an aftermarket 7-way vehicle side connector on your 2015 Ford F-250. I have attached a trailer wiring diagram help article to assist.
    view full answer...
  • Protecting Trailer's 7-way Trailer Connector from Moisture
    Surprisingly enough, we don't offer a cap that would slip over the 7-way connector on your trailer and protect the contacts from the elements. A light coat of dielectric grease, part # 11755 would act to exclude moisture form the connector. To protect the connector, I've seen folks simply use a ziplock bag and a rubber band to secure it. It's not the most elegant solution, but it's inexpensive and it works.
    view full answer...
  • Going From Trailer Side 4-Way to 7-Way
    Though that 7-way isn't a part we offer so I can't confirm it's viability, what you will need to do is just cut off your 4-way and attach its wires to the 7-way. For trailer side 7-way connectors we offer, such as # A7WCB, if you are looking at it from the front, the pin in the 1 o'clock position is tail/running lights, 3 o'clock is left turn/stop, 5 o'clock is ground, and 9 o'clock is right turn/stop. The only way to confirm what the function of your 4-way are is to use a separate 12...
    view full answer...
  • 7-Way Trailer Socket to Mate with Plug A7WCB
    Part # A7WCB uses a connector format known as an RV-style 7-way blade. Although the plug itself is round the actual electrical contacts are flat or blade style. This male plug mates with a female socket such as # 37185 or # 30717. I am not familiar with the DTS brand but I presume it is the maker of the connector you have. My contact at Blue Ox confirmed that the threaded rods on the crossbar can be bent to fit a wide range of 6-way and 7-way trailer socket mounting hole spacing. I...
    view full answer...
  • Troubleshooting 7-Way Mercedes Vito LED Problems
    German vehicles notoriously do not like towing trailers with LED taillights. What you described sounds like a case of this where the vehicle is looking for more amperage draw and the LEDs just don't have it. For a 7-way adapter designed for German vehicles towing LED lighted trailer to prevent the bulb out issue we have the part # C57003. This will plug right into the 7-way you have.
    view full answer...
  • Replacement 7-Way Plug and Cable for Hayes Sway Master Electronic Sway Control System
    A replacement 7-way plug and cable for the Hayes Sway Master Electronic Sway Control System is not offered. My contact at Hayes confirmed that the 7-way cable is hard-wired inside the control box and that no replacement part is offered. If the cable is still good and you need only the 7-way plug we do offer parts that will work for you. You can use Optronics 7-Way Round RV Style Trailer Connector # A7WCB or the Mighty Cord part # A10-7081VP.
    view full answer...
  • Trailer Wiring for 2014 Toyota 4Runner to Use Harmar Powerchair Lift
    I have a solution for you, but you will have to remove the connectors on your powerchair lift and wire it to a 7-way instead like the # A7WCB so that you can then install a 7-way on your 2014 Toyota 4Runner to match. The colors for the 4-way connector in your hand will match the color pin outs in the 7-way diagram I attached. You'll have to determine which of pins on the 2-way carry the power and ground and run them to the correct pins on the diagram as well. Assuming your 2014 4Runner...
    view full answer...
  • Recommended 7-Way Trailer Connector for Both Trailer and Tow Vehicle
    It looks like you found the trailer-side 7-way, part # A7WCB. If you need the wiring and connectors as well use part # e99011 instead. The installation will be much easier. In order for me to recommend the parts you need to add a 7-way connector to your tow vehicle I'll need to know the year, make, and model of it. Also, is there a 4-way on the vehicle now or is there no trailer wiring at all? If you already have a 4-way connector you can use our # ETBC7 kit to convert it to a 7-way....
    view full answer...
  • Comparison of the 7-Way Round RV Style Trailer Side Connectors # A7WCB and # PK12706
    I went out to the warehouse and got one of each of the 7-Way trailer side connectors to compare to each other. There are some major differences between the two connectors. The # A7WCB, 7-Way trailer side connector has a wire clamping mechanism that just has a clamp that wedges the wire into the connector to keep the wires from being pulled out, there is nothing at the back of the connector to prevent moisture from entering the connector. Another difference is that this connector has...
    view full answer...
  • Trailer 7-Way Wiring When Colors Dont Match
    I'm happy to assist. The 7-way plug on your trailer will have the correct pin locations even if the colors don't match. It is not uncommon for different color wires to be used. I've attached a photo with the wiring location and function so you can match those versus the function. I've also attached a video and article to assist. You can also use the circuit tester # PTW2993 to test power functions.
    view full answer...
  • 2013 Ford F-150 With Factory Brake Controller Will Not Recgonize that the Trailer is Connected
    On the 2013 Ford F-150, the trailer connected signal is activated through the electric brake circuit. Typically the 5th wire on a 5-way plug is wired for the reverse light circuit and used with surge or hydraulic brakes. If the circuit is not completed through your adapter or if the adapter is wired for the reverse pin and not trailer brake pin on your truck's 7-way, then you will not have the correct trailer electric connection. The plug adapter that you are using may be reading the...
    view full answer...
  • How to Determine the Functions of Trailer Wires to Install a New 7-Way Connector
    The easiest way of determining the functions of the wires on your trailer is to apply power to each one individually using a separate 12 volt battery and see what lights up. Then all you have to do is label the wires and attach them to a trailer side 7-Way such as # A7WCB. I have linked a video showing an example installation for you. Since there is no standard for wire color and function the wires will have to be tested to determine the functions.
    view full answer...




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Brandon M
Expert Research:
Adam R
Video Edited:
Zack K
Video by:
Andrew K
Installed by:
Rick A
Installed by:
Cole B
Updated by:
Brian T
Updated by:
Noah M

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.