Adapter 7 Pole to 5 Pole Flat Wired Adapter

Adapter 7 Pole to 5 Pole Flat Wired Adapter

Item # A57WB

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Wiring A57WB - 16 Inch Long - Optronics
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  • Wiring Adapters
  • Single-Function Adapter
  • 5 Flat
  • 7 Blade
  • Plug and Lead
  • Optronics
  • 16 Inch Long
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 (62)
  • Q & A (15)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Wiring - A57WB


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







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 Wiring - Wiring Adapters - A57WB Review

Today we're going to be reviewing part number A57WB. This is the 7-Pole to 5-Pole Flat Wired Adapter from Optronics. This is an adapter that's going to convert 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. It's going to give us a length of 16 inches. Each connector is going to feature the nice, easy grips that's designed to allow for quick connect and disconnecting.

Very simple operation when it comes to making the connection. All you have to do is plug this into your 7-way connector and then make the connection with your 5-way flat connector. The 7-pole plug on the Optronics adapter does only have 5 contacts installed. This is intentional since the 5-pole flat connector can support only 4 circuits, plus the ground. That's going to do it for our review of part number A57WB.

This is the 7-Pole to 5-Pole Flat Wired Adapter from Optronics. .


Customer Reviews

Adapter 7 Pole to 5 Pole Flat Wired Adapter - A57WB

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


- A57WB
by:

Good product, worked exactly as expected. Great price and quick delivery. Thank you etrailer!. 326097



- A57WB
by:

Perfect fit and works flawlessly 352590


Comments

Still working great! Well made

Herman L - 03/14/2018

35876

- 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:

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:

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



- 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:

Easy to order on line, and got it on ti me. 443155



- A57WB
by:

A57WB Made hooking a boat trailer to my suburban a piece of cake! E trailer should update their Web site putting the A57WB up front showing how easy a connection can be. 392236



- A57WB
by:

Very good quality and works as designed. 391505



- 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:

Product was exactly what I wanted. 384710



- A57WB
by:

Great quality, great price! 383800



- A57WB
by:

This place is very helpful.Pat done a real good job of looking up some parts for me,she got just what I wanted.The parts were shipped out that day. Fast friendly service. Thanks 376572



- A57WB
by:

I re-wired my boat trailer and up-dated my lights with these things.. great products worked better than I thought ! 347147



- A57WB
by:

Got exactly what I needed in a timely manner. Seems no one locally had any idea what I was looking for. Thanks etrailer 338426



- A57WB
by:

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



- A57WB
by:

This was a plug and forget product. No issues, none, since installation one year ago. 325163



- A57WB
by:

Ordering was fast easy and came quickly with emails to let me know its travel. George was very nice to keep us informed. Will order again for any trailer parts I may need. Part was exactly what we needed and at a very good price. Thank you Beatrice 314797



- A57WB
by:

Great product! It was easy as "Plug and Play". 308855



- A57WB
by:

Perfect for my 3/4 ton. Was a tad bit short for the connection. This solved the problem. Well made. 260664



- A57WB
by:

I was unable to find this wiring harness at any of the local automotive or farm supply stores. It is exactly what I needed for my boat trailer and the product works great. Once I ordered the product, it arrived at my house within days, which is great service on top of a solid product. 252614


Comments

Still very happy with the wire harness. Thanks for following up this isextraordinary customer service ...

Russ - 01/26/2018

33745

- A57WB
by:

This was the perfect harness between my pickup and the different trailers we tow. 249993



- A57WB
by:

Makes using a different hitch a breeze. As sometimes you need more drop and setback which shortens the harness. 247077


Comments

Very pleased with product well made

Terry - 04/28/2017

23501

- A57WB
by:

Order arrived as promised, hooked it up to my Tundra and it work flawlessly. If you needed the extra extension like I do, this is it. The adapter feels very sturdy and I think it's going to last a long time. Definitely will do business with etrailer again, you guys are awesome. Thanks, Ben 246169



- A57WB
by:

Product was way better than I expected. .. 238821



- A57WB
by:

Product worked as described. This is going to make connecting my Lexus GX460 to my boat trailer a breeze. Glad I found etrailer.com. 238142



- A57WB
by:

Was as presented and now I have my boat set up to my truck wiring as easy as plugging it in. I like easy in my retirement! 227983



- A57WB
by:

Second time ordering from etrailer. Great, prompt service. Item delivered promptly and looks & works perfectly. 227953



- A57WB
by:

High quality, works great, very quick s hipping! 225714



- A57WB
by:

Great item, just what I needed and a fair price. not an easy item to find at most marina supplies. Delivery time was good would buy from your business again. 222428


Comments

Still works fine, very good quality item.

jerry c - 09/04/2016

20806

- A57WB
by:

Harness was heavily constructed, tech support was awesome, shipped same day and was in my hands within 3 days. My boat trailer is very happy! 203641



- A57WB
by:

Quick deliver, great product! 189100



- A57WB
by:

Item appears to be of good quality, now we will test it out towing the boat 183899



- A57WB
by:

Added backup lights to my boat trailer. Needed this adapter. Good price, good quality. 183573



- A57WB
by:

Excellent extension for long tongue tra ilers 183327



- A57WB
by:

Great product for the money. Quaity is great and deliverey was sooner than estimated. 154033



- A57WB
by:

product worked perfectly 153608



- A57WB
by:

works perfect. Nothing else to say. 142195



- A57WB
by:

This extension was exactly what I needed to hook up my Ranger Bass Boat to other's trucks where the original trailer lights are not long enough. Great product and price. 139856



- A57WB
by:

The 7-way blade to 5 pin adapter is terrific. The quality of the connector's sockets and ground pin are excellent. Likewise, the outer jacket and molded connectors make the adapter nearly impervious to environmental induced deterioration. 136215



- A57WB
by:

Plug and play,,,,,what more can you ask for? 126613



- A57WB
by:

Speedy Service and delivery,nice adapter 123931



- A57WB
by:

This adapter is made out of quality material. It was a perfect fit on my Envoy, and boat trailer. I would recommend this item to anyone who is in need of this type of adapter. 122215


Comments

After using this adapter for a year, it still works great. I have had no problems.,

Frank F - 03/30/2015

10459

- 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


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Ask the Experts about this Optronics Wiring

Do you have a question about this Wiring?


  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...


Do you have a question about this Wiring?




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Info for this part was:

Expert Research:
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Expert Research:
Jeff D
Expert Research:
Jameson C
Video Edited:
Jacob T
Expert Research:
John H
Expert Research:
Jeffrey L
Installed by:
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Video by:
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Updated by:
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