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7-Way Round RV Style Trailer Connector - Trailer Side

7-Way Round RV Style Trailer Connector - Trailer Side

Item # A7WCB
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Trailer Wiring A7WCB - 7 Round - Blade - Optronics
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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 trailer wiring from Optronics. 7-Way Round RV Style Trailer Connector - Trailer Side part number A7WCB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Optronics Trailer Wiring - A7WCB

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - 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:  4.7 out of 5 stars   (209 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:

Very easy to install. The labeling was perfect and easy to read for the wire connection. The only thing you need to be careful with is the 2 screws to secure the wiring into the housing. I would recommend using hand tools as they will easily strip if using a power tool. I installed a bigger screw so it would tighten again. Other than that it is a great product.



- A7WCB
by:

Junk. Broke very quickly. Just from normal use. Its cheap, thin plastic with a poor retaining screw.


Comments
I recommend taking a look at part # HM48510
Hopkins Endurance Metal Trailer Connector - 7-Pole RV Style - Trailer End
$15.38
. This connector that has a zinc plated exterior and a limited 3-year warranty.
-- Etrailer Expert Jenny N - 04/19/2022


- A7WCB
by:

We have an older 5th wheel and needed to change out the connector to match up with our new tow vehicle. The connection worked out perfectly!



- A7WCB
by:

THIS WAS AN EASY FIX FOR THE OLD WORN OUT CONNECTOR I REPLACED. SOME OF MY LIGHTS AND TRAILER BRAKES WERE NOT WORKING. THE CULPRIT, A WORN AND CORRODED CONNECTOR. THIS IS EXACTLY WHAT IS DESCRIBED AT A GREAT PRICE!



- A7WCB
by:

This Connector has held up pretty good so far. I am happy I chose it. I would purchase this again.


Comments
Connector is still working well. Good device.
Bill J - 11/09/2021


- 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..............


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



- A7WCB
by:

The replacement plug worked perfectly and solved my issues.



- A7WCB
by:

It works, only a single connection pet plug while other have 2 per plug section. We will see how oong it will hold up



- A7WCB
by:

Good replacement for my broken plug



- A7WCB
by:

Works great



- A7WCB
by:

Perfect fit



- A7WCB
by:

Great price, very quick delivery.



- A7WCB
by:

Wired it in and it works. Not much more to say. Works on my buddy's 2006 F-150 and on my 2003 Dodge Neon (yeah...you heard that right) and also on my 2016 Sierra Denali.



- A7WCB
by:

Fit and function excellent!



- 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.



- A7WCB
by:

Excellent, price is even better



- A7WCB
by:

I USED THE E TRAILER AND POLLAK BRAND AND I WOULD GO WITH THE E TRAILER ACCOUNT OF THE CONNECTION TO HOLD TRAILER WIRES IN ON THE BACK OF THE PLUG.



- A7WCB
by:

I RARELY DO THESE RATINGS BUT YOUR COMPANY HAS BEEN SO INCREDIBLE IN EVERY WAY THAT I AM COMPELLED TO GIVE YOU THE HIGHEST RATING POSSIBLE ON ALL COUNTS--I WISH THERE WERE MORE LIKE YOU!



- A7WCB
by:

Perfect fit. Easy to use. Great product. Using this to help trickle charge a battery for the trailer winch.



- A7WCB
by:

For $5 I guess you get what you pay for. Already a slight crack from tightening the set screw. The color code must of been of been for an RV since its all different for my snowmobile trailer. It will work until I can find a better quality connector.


Comments
For something a bit more durable, a plug and lead connector like the ones Ive linked to would be a perfect choice. Keep in mind, theres more than one accepted wiring color code for a 7-way trailer connector, so be sure to pay attention to the color code listed on the products description page.
-- Etrailer Expert Mike L - 01/17/2019


- A7WCB
by:

Converted my trailer into a 7 wire, with the help of this connector and etrailer's how-to videos. Easy installation and good quality.



- A7WCB
by:

The parts installed and worked absolutely perfectly. I had to call and get them rush shipped to our house because my wife needed the trailer and had a small window to make her trip. You guys made that happen. It was a five star situation both service and parts.



- A7WCB
by:

Great Job on Delivery of Perfect Parts



- A7WCB
by:

The 7-way trailer connector was easy to install, and works perfectly with my 2019 F250.



- 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!


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Show More Reviews

Ask the Experts about this Optronics Trailer Wiring



  • 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...
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  • 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...
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  • 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...
    Image 1 for
  • 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...
    Image 1 for
  • 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...
  • 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...
    Image 1 for
  • 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...
    Image 1 for
  • 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...
  • Will 7-Way Round RV Style Trailer Connector Fit a 2015 Chevy Silverado's 7-Way Connector
    Yes, 7-Way Round RV Style Trailer Connector # A7WCB will fit into the 7-Way on your 2015 Chevy Silverado. I have included a video showing an example installation for you and a link to our help article on trailer wiring.
    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 o'clock...
    view full answer...
    Image 1 for
  • 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...
    Image 1 for
  • Solution to Go from 7-Way Blade to 4-Way Round Trailer Wiring
    Since there isn't an adapter available to convert the 4-way to a 7-way your best option would be to cut off the 4-way and wire it to a 7-way connector like part # A7WCB. This way your trailer will not require an adapter and everything would work.
    view full answer...
    Image 1 for
  • Solution for Connecting Trailer with 4-Way Round to 7-Way
    Since there isn't an adapter available to convert the 4-way to a 7-way your best option would be to cut off the 4-way and wire it to a 7-way connector like part # A7WCB. This way your trailer will not require an adapter and everything would work.
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Charge Line Wiring Provision on 2018 Silverado 3500
    I would first begin by checking the engine compartment fuse box to ensure the fuse is installed and in working condition. These fuse/relays are sometimes left out depending on what packages are installed in the truck. For your 2018 Chevrolet Silverado 3500HD it should be the #2 fuse but be sure to confirm that with your owners manual. Also form the owners manual "the auxiliary battery provision can be used to supply electrical power to additional equipment that may be added, such as a slide-in...
    view full answer...
  • Why Would New Self-Adjusting Trailer Brakes Seem Weak
    We find that at times the self-adjusting brakes need to be "manually" adjusted the first time when they are installed. You can do this by going to a parking lot with the trailer attached. Then drive the trailer in an empty parking lot and apply the brake a number of times to get the proper adjustment. Each time you apply the brakes with either the pedal or the manual override lever the adjustment wheel will click tighter.
    view full answer...
  • Troubleshooting Trailer Brake Controller That Doesn't Show Trailer Connection
    Sounds like you have some corrosion on your trailer wiring connector which is preventing your controller from sensing a trailer connection and being able to activate the trailer brakes. This is a very common problem and all you typically have to do is take some sandpaper to the pins on the trailer connector and you'll get a solid enough connection for the controller to start working again. I also attached a help article on brake controller troubleshooting for you to check out as well.
    view full answer...
  • No Power To Trailer Running Light Pin on a Ford F-150
    If you don't have any power to the running light pin on the trailer connector on your Ford F-150 then most likely you just have a blown fuse. If you check in your owner's manual or on the underside of the engine bay fuse box lid that should then tell you which fuse to check. If the fuse is good then the next thing you will want to do is start tracing as much of the wire back as possible while checking for breaks.
    view full answer...
  • What Is Most Common Reason Trailer Brake Controller Stops Working
    A brake controller not wanting to function can be for a few reasons. But most of the time it's just a dirty pin on the trailer wiring connectors. So I'd first try cleaning off all of the pins to see if that helps. I also attached a help article linked that has troubleshooting tips for brake controllers as well.
    view full answer...
  • Are Electric Brakes Wired to Brake Controller Output Wire?
    Your electric brakes should be wired to the brake controller output and you are correct that the other is a ground wire (please see accompanying diagram). What you'll need to do is use a circuit tester to find the correct pin on your 6-way. I've added a diagram showing what those pins typically are on a 6-way. Please note that in some applications, the black battery power connection and the blue brake controller output connection are reversed. I've also added a link to a help article...
    view full answer...
    Image 1 for Image 2 for
  • Determining Wire Functions on Trailer with Non-Standard Wire Colors
    Since the wiring on your trailer doesn't use the standard colors the best method for determine their function is to simply apply 12V power to each one to see which lights they activate. Once you determine the function for each of the wires you will just need to connect them to the corresponding terminal on the 7-Way connector. I have attached a wiring diagram for a 7-Way that you can use for reference.
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting Brake Output Circuit on 5th Wheel Trailer
    I'd be happy to provide a trailer wiring diagrams for you. Just use the provided link. Typically, the brake output circuit on a trailer is a blue wire, but since you can't depend on the wire color especially if the trailer was previously owned, it's always better to wire by function than wire color. The help article I linked to also shows how to properly wire a 7-way trailer connector, so you can ensure everything's connected properly. Also, if you're using a proportional controller, you...
    view full answer...
  • Troubleshooting Trailer Charge Line Circuit and Brake Controller No Longer Receive Power
    It sounds like you have an issue with the battery connections for both the brake controller and the charge line on your 7-way circuit. When the shop installed the 7-way on your vehicle and brake controller they would have installed some type of fuse system to protect the wiring from becoming damaged due to excessive draw. If your 7-way is on a vehicle that does not have any factory wiring these fuses or circuit breakers will be inline of the wiring that was installed. You will need to find...
    view full answer...
  • Troubleshooting Trailer Running Light Circuit that Gets Hot
    If a trailer wiring circuit is getting hot that means it's either over drawing or there's a short on the circuit. Since this is the trailer wiring circuit and you've already tried cleaning up the wiring it's most likely that the circuit is trying to draw more than it can provide. One way to reduce the load on the circuit is to convert some of the taillights to LED which only draw a fraction of the amperage as incandescent bulbs. I attached a link to a page that has all of the trailer...
    view full answer...
  • Does 12 Volt Accessory Circuit of 7-Way Charge Camper Battery
    Yes, the 12 volt accessory circuit of your 2020 Ford F-150 will charge the battery that's on your camper. It would be more of a maintenance charge to keep the battery topped off.
    view full answer...


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