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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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Optronics Trailer Connectors - A7WCB
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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 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.
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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 Wiring - Trailer Connectors - A7WCB Review

Today we'll be reviewing part number A7WCB. This is the Optronics Seven Way Round Army Style trailer connector. This is a round plug that connects with the seven way round blade connector of your tow vehicle. See here that it has a nice ABS plastic housing so it's going to be very strong and very durable. It's got the connections up here. You also have the interlock system so once you make the connection this will actually lock in place for a nice secure hold. You have the over sized finger tabs right back here that's going to allow disconnecting to be very simple and effortless. You have a couple of set screw back here.

That's just going to control that insert. That's going to really help keep dust and moisture out of the connection points once you have your wires ran through there. You just tighten that back up and that insert's going to close up against the wires providing a nice, secure fit. You have another set screw here on top. That's going to allow this connection point to actually come out of the housing. You run your wires through, get this portion out, make your connections, put it back in, and then reset the screw up top and the screws here on the back. That' s going to do it for our review of part number A7WCB.

This is the Optronics Seven Way Round Army Style trailer connector. .


Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (160 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:

Good value 927459



- A7WCB
by:

925141



- A7WCB
by:

Nice person to Atendant and help me decide what I need and buy the product I need They delivery the material in good time 914164



- A7WCB
by: 11/16/2020

The 7-way trailer connector was easy to install, and works perfectly with my 2019 F250. 912578



- A7WCB
by:

911241



- A7WCB
by:

Exactly what I needed. Heavy duty, it will last a long time before it needs to be replaced. 911101



- A7WCB
by:

I received the plugs in great time and in excellent condition. 910603



- A7WCB
by:

This Connector has held up pretty good so far. I am happy I chose it. I would purchase this again. 909623



- A7WCB
by:

Easy to install 907765



- A7WCB
by:

Better than expected...works great. 907605



- A7WCB
by:

This replaced the original connector, which I damaged. This was a simple install because all the lugs are clearly marked with the names of the wire colors. Also, the retainer at the rear of the plug that holds the wire in place, is much more secure than my original plug. 900941



- A7WCB
by:

The color code inside the plug didn't match mine, and was different that what appeared to be standard. Worked well other than that. 896697



- 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


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Ask the Experts about this Optronics Wiring

  • 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...
  • 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...
  • 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...
  • Troubleshooting Locked Trailer Brakes
    If your trailer brakes are still locked up, but not locked when the 7-way is disconnected that is a sure sign of one of two problems, either the wiring to the brakes has been damaged or the connector has corrosion which is causing the problem. The easiest thing to do is start by checking your connectors to see if there is an white or corrosion on the pins, which would be causing this issue. You will want to either clean it or replace the connectors as needed. If you have a new vehicle...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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 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...
  • 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...
  • 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...
  • Adding a 7-Way Trailer Connector to a 2000 GMC 3500 Sierra
    In 2000 there was both a GMC Sierra model and a GMC C/K series with a Sierra trim option. If yours is an actual Sierra model then to add a compatible 7-Way you will need # HM40975 if there is a wiring harness up above the spare tire with a round plug. But if it is just a wire bundle, no plug, you can use # PK11898. It has the following wire functions: Red - Left Turn and Stop White - Ground Blue - Electric Brakes Green - Right Turn and Stop Black - Battery Brown - Running Lamps Yellow...
    view full answer...
  • How to Use the 7 Way Plug to Power a Fuel Pump
    Good news! I can help you wire your 12 volt fuel pump to work with your 7 way vehicle plug. To accomplish this task you will need a few things: 7-way plug # A7WCB 10 gauge wire # 10-2-1 2 pole flat wiring # HM47965 butt connectors # DW05745-5 First thing you will want to do is wire the 7 way plug with the 10 gauge wire to the ground and 12 volt power wire. The 12 volt power will be in the 1 o'clock position and the ground is in the 7 o'clock position. I've included a picture...
    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...
  • 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...
  • 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...




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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

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