1. Wiring
  2. Optronics
  3. Wiring Adapters
  4. Single-Function Adapter
  5. 5 Flat
  6. Plug and Lead
Adapter 7 Pole to 5 Pole Flat Wired Adapter

Adapter 7 Pole to 5 Pole Flat Wired Adapter

Item # A57WB
lowest price pledge
Retail:$27.06
Our Price: $14.65
You Save: 46%
Wiring
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.52 lbs
Quantity: 
In Stock
zoom in 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

Lowest Prices for the best wiring from Optronics. Adapter 7 Pole to 5 Pole Flat Wired Adapter part number A57WB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (70)
  • Q & A (15)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Wiring - A57WB

  • Wiring Adapters
  • Single-Function Adapter
  • 5 Flat
  • Plug and Lead
  • 7 Blade
  • Optronics
  • 0 - 5 Feet Long


5-Way Flat to 7-Way RV Blade Adapter - Wired

This is an adapter that converts the tow vehicle's 7-way blade connector into a 5-way flat pin connector. This model has a short length of wire joining the two connectors.

  • 16" Long
  • Converts a 7-way blade connector into a 5-way flat pin connector


A57WB Adapter 7 Pole to 5 Pole Flat Wired Adapter

Alternate part number: A-57WB




California residents: click here


Video of Adapter 7 Pole to 5 Pole Flat Wired Adapter

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




Video Transcript for Optronics 7 Pole to 5 Pole Flat Wired Adapter Review

Randy: Hey guys, it's Randy here at etrailer.com. Oftentimes, our customers ask us for a solution to turn their regular working seven pole on the back of their vehicle into either a four pole or five pole flat. This is one of many options that we have here at etrailer. This one's from Optronics. Now, unlike a lot of the other ones that we have like this where the plugs are mounted pretty much right here on the back side of the plug, this is also going to give us an extension. Now, this is about 21 inches from this tab right here which is going to be about midway on your door to the end of the plug there, just to give you an idea.

It's going to give you a nice, long reach. This can be really important if the trailer that you are using has a short pigtail on it.If your plug, like on a Trailblazer, or a Toyota 4Runner, if it's way up underneath here and you need to get some reach back, or in lifted applications. A lot of times, you're going to have in a lifted truck, you're going to have a pretty deep drop, and the longer those get, the more and more length we need to get from our connector to the trailer.Now, basic four pole functions are going to be running lights, ground, left turn signal and brake, and right turn signal and brake. The fifth one that we have here, that's used a lot of times in marine trailer applications. That's your reverse signal.

As you shift your vehicle in reverse, that's going to send power through, and that can prevent a surge coupler from locking up. So as you're trying to back up, it'll back up smoothly. But customers also ask frequently if they can power some trailer lights off of it, if they can power some backup light. So as you get to your destination, you throw it in reverse, you'll have a lot of light behind you to see, and that's perfectly acceptable.Now, other than the extension portion of this, I think this is a really, really rugged adapter. Everything has been molded on, so we don't have any gaps in it anywhere.

This isn't going to be something that we have any concern about it over time, water seeping into it and causing us issues. I really like the way it's designed. It feels really good. If I had a need for this, then I would definitely own it, whether it was a short pigtail or if I had a lifted truck and I needed to get a little bit more reach. I do have a Trailblazer, and this would come in handy when I plug it underneath there.

I actually made my own. I didn't know this one existed or I would've just bought this one. It would've been easier.Now, as far as the installation process goes, it's no different than a standard seven pole. You're just going to slide this in so that the catch on the door fits in behind this tab. It's going to keep it nice and secured, prevent it from coming out. Then on the other end, we're just going to plug in our trailer. Now, one little tip; if your four pole connector is shielded, meaning that these pins are inside of a large, black plastic cover or that they don't stick out like what you see here, using that in a four pole application will require you to trim just the end of it off. You can see as this goes in, if that shield was in the way, it wouldn't allow it to slide down inaudible 00:03:12. So you might have to recess it for that. But as you can see, it's an excellent solution. It's going to give us the extension we need, be able to power a trailer and keep us safe.If this plug we're not to reach the back of your truck, or if you didn't have a working seven pole, with short distances, a lot of people just leave it off, and that makes a dangerous situation for us. Being able to see what a trailer's doing in front of you makes the experience a lot better. For anybody driving behind you, they know if you're stopping or if you're turning, so it is important.As far as customer reviews go, it gets really, really high reviews and kind of some of the things I said, just how sturdy and how good quality it feels is really important. Some of these adapters can sometimes feel a little bit more flimsy. Although they do the job really well, they just don't feel as high a quality as what we have here. Now, with any plugs like this, we always recommend dielectric grease. This is available on our website if you don't have it. Just want to put it on each of the connection points there. That's going to keep moisture out. We don't have any moisture in there, we don't have dirt holding, we're not going to have any corrosion.The one slight dig, I guess, I would have on it, you can see that our connectors on this side are brass. Those tend to corrode a little bit more quickly than what we get out of a nickel coated style. But I think all in all, you put a little dielectric grease in here, this is going to solve a lot of problems for you.


Customer Reviews

Adapter 7 Pole to 5 Pole Flat Wired Adapter - A57WB

Average Customer Rating:  4.9 out of 5 stars   (69 Customer Reviews)


- A57WB
by:

Great product at a great price! Thank you... 333616



- A57WB
by:

Product was exactly what I wanted. 384710



- A57WB
by:

This purchase was my second from e_trailer. Both tomes the experience was vert good and rhe products delivered on time and of good quality Lloud 688083



- A57WB
by:

Very good quality and works as designed. 391505



- A57WB
by:

works perfect. Nothing else to say. 142195



- A57WB
by:

I haven't used the connector but my initial thoughts are that it's built solid, doesn't feel cheaply made. The only thing I see that might potentially be an issue is that there is no tension on the pins when plugged in to the connector on my truck. Not sure if this is normal or if I got a lemon. 379838



- A57WB
by:

Quick deliver, great product! 189100



- A57WB
by:

Although I have yet to use it,this is exactly what I needed for my new to me rig. 5 pin trailer side plugs aren't easy to find but this one does it all,quality made, at a good price and fast shipping. 116128



- A57WB
by:

I needed this to hook up my new 5 pin trailer with surge brakes to my truck with a 7 pin plug. Not only does it allow me to back up and release the brakes but my trailer assist feature now works with the back up camera. 386281


Comments
After a year its working just fine. Very happy with this purchase.
Dennis - 05/29/2018

39059

- A57WB
by:

This is a somewhat unusual and hard to find item at most stores selling automotive trailer wiring accessories and harnesses. I purchased a new 4X4 pickup which has the 7-blade connector to the left side of the license plate holder on the rear bumper step. Previously, I had my 7-blade connector immediately adjacent to my receiver housing on the underside of my rear bumper. And, with the higher profile of the 4X4, I now use a 3 1/2" drop drawbar to mount my 2" ball. This new arrangement puts my boat trailer harness extended to it's maximum, with minimal room for wide, short turns over a small distance, or backing up at sharp angles. Enter this Optronics adapter, which adds another 18" to the pigtail side of my trailer wiring, and provides only a single connection between the two five way flat connectors. Molded in 7-blade plug and solid jacketed 12Ga wiring with the five way flat female connector molded in on the other side. This adapter works like a champ and looks great! 493086


Comments
This adapter has been in use about 150 days over the past year and performs without any problems. Connections remain tight and waterproof, and we have certainly found ourselves having to tow in some extremely wet weather conditions last year. Although this is an economy-rated product compared to some others you have available, I could not see needing a better adapter/extension than this one by Optronics.
Chris W - 04/06/2019

51534

- A57WB
by:

Excellent product, fast delivery 805239



- A57WB
by:

It's a good idea to keep a spare. This part is the weak link in every light system. 800262



- A57WB
by:

Product has been everything that I need. 786507



- A57WB
by:

I need a harness adapter and I ordered it overnight, I received a shipping email hours after I ordered it and it was here just minutes before I needed to start my trip. Thanks for the awesome service!! 783153



- A57WB
by:

Used the adapter multiple times! Not much to say except works great! Extremely satisfied. I can however not say enough about strainers customer service. They are awesome plain and simple. Thanks for following up to see how I liked the adapter! 772854



- A57WB
by:

Good quality. 763823



- A57WB
by:

This worked great. I am pulling my trailers with a Mercedes GLS and needed a converter. It stays in the truck all the time! 763072



- A57WB
by:

Product exactly as described, and what i needed.....really fast delivery 737005



- A57WB
by:

I love this thing! The best part is the cable length. I was needing to either splice into the trailer's wiring and extend it or create a foot long extension. This did it for me! I am going to show it to our local trailer manufacturer. 652342



- A57WB
by:

Great trailer connector, plenty log enough to hook up any connection you have got. Can't beat the price 652133



- A57WB
by:

very well built product. Much better than you can buy in local stores 601166



- A57WB
by:

Very nice product. Great Quality and Very Fast Shipping. 576552



- A57WB
by:

This is just what we need, a sturdy 7 to 5 pole adapter that is long enough to connect to the wiring of our boat trailer. In addition, we received it promptly. 558994



- A57WB
by:

works great. No issues 556100



- A57WB
by:

Great adapter 500284


25
70
Show More Reviews

Ask the Experts about this Optronics Wiring

  • Will a 4-Pole Flat Trailer Connector also Fit this 5-Pole Flat
    Most standard 4-Pole flat connectors will fit this 5-Pole flat connector. There are quite a few options as far as adapters that you could use. I have added a link to all the 7-Pole to 4-Pole adapters we have. One in particular has both 4-Pole and 5-Pole connectors, part # 37385. We also have a coiled version of the part you were looking at, part # HM47075.
    view full answer...
  • Can One Of The Five Wires On A 5-Way Trailer Connector Be Used For Backup Lights On A Trailer
    The 5-way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signal to the hydraulic coupler to disengage the trailer brakes when the vehicle is put in reverse. If you are not going to use the fifth wire on the 5-way to disengage your brakes on your trailer you could run the fifth wire on your trailer connector to the backup lights on the trailer. You will...
    view full answer...
  • Recommendation for a 4-Way Flat to 5-Way Flat Adapter for a Boat Trailer
    We do have an adapter to go from a 4-Way on a vehicle to a 5-Way on a trailer. You can use # 20036. The extra blue wire will get wired into the reverse light circuit on the vehicle. The 5th wire on a boat trailer 5-Way is usually for an electric reverse lockout. When the vehicle is placed in reverse it sends a signal back to a solenoid on the actuator and does not allow the brakes to engage.
    view full answer...
  • Using 4 to 5-Pole Trailer Connector Adapter # 20036 for Towing Boat w/ 2011 Toyota Highlander
    The extra pin on your boat trailer's connector is most likely a reverse lock-out for your surge or hydraulic trailer coupler. The extra circuit is tied into the reverse light circuit of your vehicle. When the vehicle transmission is shifted into reverse, the reverse light circuit energizes and activates a solenoid in your coupler, which allows you to back the trailer without the brakes applying. We do indeed have an adapter that would work for you, part # 20036. The extra blue wire on...
    view full answer...
  • Could 5-Way of 5-Way to 7-Way Adapter be Removed and Wired to Trailer Wiring
    Yes, if you wanted to just remove the 5-pin on your trailer as well as on your adapter you could wire the 7-way left over to the wiring of the trailer. If the colors are the same on the trailer wiring side as what the pins correspond to on the adapter's wiring then you could match them color by color.
    view full answer...
  • Will Optronics 7-Way To 5-Way Adapter Replace Pollak Adapter
    You will want to check the style pins on your adapter you currently have to make sure you get the correct style. The Optronics 7 Pole to 5 Pole Flat Wired Adapter, part # A57WB, is designed to fit a blade-style connector. The adapter converts a 7-way connector and gives you a 5-way flat connector, and is 16 inches long.
    view full answer...
  • How Many Circuits are Supported by the Optronics 7 Pole to 5 Pole Flat Wired Adapter # A57WB
    Thank you for your recent purchases from etrailer. The Optronics 7 Pole to 5 Pole Flat Wired Adapter # A57WB that you purchased is intended to allow a tow vehicle with an RV-style 7-way blade type trailer socket to connect to a trailer that uses a 5-pole flat type connector. The linked article on trailer wiring shows these and other connector types commonly in use. The 5th wire on a typical 5-pole trailer is usually blue in color and is there to carry signals for electric trailer...
    view full answer...
  • Availability of 32 Inch Long 7-Way to 5-Pole Trailer Connector Adapter
    The Hopkins Heavy Duty Coiled Trailer Connector Adapter, part # HM47075 should fit your needs very nicely. When stretched, the cable measures 36 inches long. If you were looking for something that did not have a coiled cord, an adapter could be constructed using a 7-way vehicle end plug, part # PK12706 and a 5-pole vehicle end, part # 20016. You could also use a 3 foot length of wire loom, part # 459075-1 (sold by the foot) for a neater appearance.
    view full answer...
  • Is Optronics 7 Pole to 5 Pole Flat Wired Adapter Waterproof
    For something to be considered waterproof it has to be able to be submerged under water for a certain amount of time and not let any water in. Based on that the Optronics adapter # A57WB is not technically waterproof. But at the same time you should unplug the trailer from the tow vehicle prior to submerging the trailer in the water so as to eliminate any chance of a short caused by water. Using dielectric grease, # 11755, on the trailer connectors/adapter will repel moisture and would...
    view full answer...
  • Recommendations For 7-Way to 5-Way Trailer Wire Adapters
    You can install a 7-way trailer plug on the trailer and only wire the 5 circuits you need based on our FAQ page on wiring, which I have provided a link to. If you go this route, you will need to trace each circuit on the trailer to determine its function and then wire it to the plug accordingly. I have provided a graphic showing the function of each individual circuit on the 7-way trailer plug. You also might need a new adapter to connect your 7-way plug on your vehicle to the 5-way...
    view full answer...
  • Can Trailer be Wired for Backup Lights Using 5-Way Plug and then Converted to 7-Way
    Yes, you could wire your trailer to have backup lights by using a 5-way flat like the Hopkins Endurance Trailer Connector, # HM47910, and then use an adapter like the 7 Pole to 5 Pole Flat Wired Adapter, # A57WB, to be able to plug in to your vehicle's 7-way. Although wiring the 5-way connector for backup lights and then converting to the 7-way will work, this will require more parts than what is necessary. I recommend just wiring in a 7-way connector like the Pollak Black Plastic, 7-Pole,...
    view full answer...
  • Recommended Adapter to Convert 7-Way Blade Connector to 5-Pole Flat Connector
    We offer a range of trailer wiring adapters to let you join a vehicle with one connector type to a trailer with a different connector. The link provided will show you all options for adapters that convert from a 7-way blade-style connector to a 5-pole flat style connector. You can use a non-wired plug-type adapter like Optronics # A75TB, or if you prefer a wired-type adapter to give you a bit of slack you can use Optronics' 16-inch adapter # A57WB. For a heavy-duty coiled adapter you...
    view full answer...
  • Adapter Needed to Use a 4-Way or 5-Way Trailer Connector with a Factory 7-Way Socket
    There are a couple of ways you could attach a 4-way or 5-way connector to your factory 7-way connector on your 2004 Chevrolet Avalanche. If you wanted to have the option to use both a 4-way and 5-way connector without having to keep track of multiple items, then you may want to check out the Hopkins 7 Pole to 4 Pole and 5 Pole Adapter, # 37385. This adapter will insert into the 7-way socket on your vehicle and has connections for a 4-way and a 5-way trailer connector. If you only...
    view full answer...
  • Recommended Wiring To Make 2011 Honda Pilot Compatible With 5-Way Trailer Wiring Reverse Solenoid
    For your 2011 Honda Pilot, I recommend you use the Honda Replacement OEM Tow Package Wiring (7-Way) w/ Circuit Protected ModuLite HD Module # 118253 so you will also have the reverse function you need. This will require you to use the Draw-Tite 6 and 7-Way Trailer Connector Mounting Box, 2-1/2" # 18156. Then you will need an adapter like # TR20141 or # A57WB. With trailer connectors, it is wise to use dielectric grease like # 11755 to keep moisture and debris out of your connections.
    view full answer...
  • Tail Lights on 1992 Ford F-150 Stay On When Connected To Boat Trailer With 7-Way to 5-Flat Adapter
    If I understand correctly, the tail lights on your 1992 Ford F-150 stay on when you connect your boat trailer to your truck using a 7-way to 5-flat adapter and when the brakes are applied the vehicle tail lights go out. It sounds to me like power is somehow feeding back to the tail light circuits on your truck and there is a short somewhere. To troubleshoot this issue, I would start at the 7 pin connector on your truck with the adapter and boat trailer disconnected. Make sure the connector...
    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:
Patrick B
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Jeffrey L
Video Edited:
Jacob T
Installed by:
Randy B
Video by:
Zach D
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.