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Wiring > Wiring Adapters > Single-Function Adapter > 7 Blade > 5 Flat > Plug Only > Optronics


Adapter 7 Pole to 5 Pole Flat - Molded

Optronics Wiring

ratingratingratingratingrating (19 reviews)


Code:   A75TB

Price:$10.95


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Optronics Wiring - A75TB

5-Way Flat to 7-Way Round Adapter - Single Piece

This is an adapter that converts the tow vehicle's 7-way round blade connector into a 5-way flat pin connector. This model is a one-piece device with one connector on each end.






Customer Reviews

Adapter 7 Pole to 5 Pole Flat - Molded - A75TB

Average Customer Rating:  ratingratingratingratingrating4.8 out of 5 stars   (19 Customer Reviews)




- A75TB

ratingratingratingratingrating by: Dan F08/31/2010

Is this review helpful?


Works as advertised I needed a simple bare bones adapter, and this works perfectly for my needs. Can't beat the price. Product seems well made. I haven't had it long enough to comment on reliability. Customer service at etrailder was fantastic - I ordered two by mistake and they corrected it with one phone call. 3401



- A75TB

ratingratingratingratingrating by: Troy04/29/2013

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It works just like it should. I had originally a 4 pin harness on my 2011 pathfinder but change to a factory 7 pin. I bought this 5 pin adapter to use with my boat trailer witch just need a connection to turn off the brakes when I reverse. 78305



- A75TB

ratingratingratingratingrating by: John U11/21/2011

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Just like it was described 27233



- A75TB

ratingratingratingratingrating by: Don P06/22/2011

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As advertised 17695



- A75TB

ratingratingratingratingrating by: Steven C.05/12/2011

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exactley what I wanted looks great works just as good 13737



- A75TB

ratingratingratingratingrating by: Marty03/10/2014

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Great product works well. I have a 7 pole to 4 pole flat that I have used for 6 years. now I need a 5 pole flat . Should get many years out of this product also.120078



- A75TB

ratingratingratingratingrating by: Joe Jacinto01/30/2014

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Plan to use it on my motorhome power outlet to a towed dinghy.115259



- A75TB

ratingratingratingratingrating by: tom12/26/2013

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Super easy, inexpensive. I was planning to add a 5 flat wiring harness for my boat, then I saw this and it works great. 111191



- A75TB

ratingratingratingratingrating by: Jim10/23/2013

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Worked for me, I needed a five pin for the electric solenoid on the brake system for a boat trailer. Worked like a charm104803



- A75TB

ratingratingratingratingrating by: JGS08/10/2013

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Very good product. Extremely knowledgeable staff! 94301



- A75TB

ratingratingratingratingrating by: Chris A.08/06/2013

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All was great with respect to this order from etrailer!93527



- A75TB

ratingratingratingratingrating by: E.Ellis08/03/2013

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Plugs in secure and easy to use. 93134



- A75TB

ratingratingratingratingrating by: John s.08/02/2013

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This is what I needed. Thank you very much for the fast shipping92963



- A75TB

ratingratingratingratingrating by: Paul V07/19/2013

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Excellent product and quick delivery! 90431



- A75TB

ratingratingratingratingrating by: Hershel03/02/2013

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Well built part 68458



- A75TB

ratingratingratingratingrating by: Jason02/26/2013

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Good Quality. 67835



- A75TB

ratingratingratingratingrating by: John01/16/2013

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Product arrived promptly and was exactly as depicted. It is of sturdy construction and works great. 63253



- A75TB

ratingratingratingratingrating by: Jim M06/15/2012

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Received as advertised, fast shipping and great customer service.44256



- A75TB

ratingratingratingratingrating by: Trevor D06/12/2012

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Great quality product! 43878



Ask the Experts about this Optronics Wiring
Expert Answers about Adapter 7 Pole to 5 Pole Flat - Molded - A75TB                                             Do you have a question about this Wiring?


  • Electrical Adapter for a 2008 GMC 1500 SLE
  • The electrical adapter, item # A75TB, converts an existing 7-pole plug to a 5-pole flat. Do you have a 7-pole plug on your GMC? If not, you will need to install a 7-way plug, item # 30955.
    view full answer...

  • Center Pole on a 7-Way End of Adapter A75TB
  • The center pole on the vehicle end is for the auxiliary wire. I will attach our wiring FAQ below for your reference.
    view full answer...

  • Compatability of the 7-way to 5-pole Connector with GM Avalanche and Hydraulic Surge Breaks
  • If your Avalanche has the factory 7-way connector installed and working properly then the Adapter 7 Pole to 5 Pole Flat, item # A75TB, will work for you. The adapter will provide the 5 pole connection with the back-up circuit to lock out hydraulic surge breaks or power reverse lighting.
    view full answer...

  • What Circuit is the 5th Pin on 7-Way to 5-Way Adapter for a 2005 Chevy Trailblazer
  • The Optronics 7 Pole to 5 Pole Flat Adapter, part # A75TB, uses the center pin on your 7-Way as the 5th pin on the 5-Way side. Most 7-Ways are wired with reverse lights at the center, including factory installed 7-Ways, so the 5th pin should be the reverse light circuit. This circuit is used on hyrdaulic brake trailers to lock out the brakes when backing up. Check the cap on the 7-Way or in the vehicle owner manual to make sure that the center pin is in fact the reverse circuit.
    view full answer...

  • Will 7-Way to 5-Way Adapter Part AT75TB Work with 4-Way Connectors as Well
  • Yes, the A75TB, 7-Way to 5-Way adapter will also work with 4-Way connectors. It will leave the 5th pin exposed which can cause corrosion if you will be towing in the rain. Part # 37385 is another option. It has both a 5-Way and a 4-Way with covers to protect them from corrosion.
    view full answer...

  • Will a 7 to 5-Way Adapter Work with an Electric Reverse Lockout On a Surge Brake Trailer Coupler
  • The center pole on a 7-Way trailer connector is the reverse light circuit. Provided that it is functional on your 2012 Toyota 4Runner, it will work with the electric reverse lockout on the coupler. You can use a circuit tester like # 3808 to determine if the center pole works with the reverse lights. First, apply the emergency brake and chock the wheels. Have someone start the vehicle and keep their foot on the brake and place the truck in reverse. Test the center pin on the 7-Way and make su
    view full answer...

  • Availability of a 7-Way Round Pin to 5-Way Flat Trailer Connector Adapter
  • It sounds like your Trailblazer had a 7-Way round pin connector and your Explorer Sport Trac has a 7-Way blade style connector. The configurations are different between the 2 different connectors. For an adapter, using the 7 Pole to 5 Pole flat, # A75TB, that you have referenced would work for you if the Ford has the blade style connector. I have included a picture that shows the differences between a 7-Way round pin and 7-Way blade style connector, vehicle side. If the vehicles both have
    view full answer...

  • How to Activate Boat Trailer Surge Brake Lockout from the Factory 7-Way on a 2012 Toyota Tacoma
  • It sounds like you have a factory 7-Way connector on your 2012 Toyota Tacoma and that you also have the dealer supplied electric brake controller wiring harness for wiring an electric brake controller in the cab of your vehicle. Since your boat trailer is equipped with surge brakes, you will not need to install an electric brake controller in the cab of your Tacoma. The first thing you should do is check the center pole, see photo, in the 7-Way connector on your vehicle with a circuit test
    view full answer...

  • Reverse Light Circuit Does Not Work on 7-Way on a 2007 Chevy Silverado New Body
  • If your trailer brake actuator has an electric lock out on it then you will need a working center pin on the 7-Way that is attached to the reverse light circuit on the truck. Since your truck has a factory 7-Way you can check the vehicle owners manual for the location of any fuses or relays related to the tow package wiring and/or reverse lights to determine if a fuse is blown or missing. I did see that you found the issue was a bent pin inside the connector. I do recommend checking the other
    view full answer...

  • 7-Way Recommendation for Activating Trailer Brakes on a Trailer with a 5-Way
  • Typically, the 5th circuit of a 5-way is for a reverse light circuit. I have a solution for you, but you will not be able to use the Adapter 7 Pole to 5 Pole Flat # A75TB to activate your trailer brakes as it has an empty port where the brake output circuit would be on your tow vehicle connector. I would recommend you confirm that the fifth circuit on your trailer is actually for trailer brakes. You can do this by tracing the wires back from the connector and see if they go to the brake assem
    view full answer...

  • Compatibility of Tow Ready 7-way to 5-pole Adapter # A75TB with 2103 Toyota 4Runner
  • The Tow Ready 7-way to 5-pole adapter that you mentioned, part # A75TB is not a vehicle specific item. As long as the 7-way on your 4Runner is fully functional, in most cases the adapter will work just fine for you. If your 4Runner has a bulb out sensor that warns you when you have a burned out taillight, and you are towing a trailer that uses LED taillights, you will need to use an adapter that has a load resistor installed in it, like part # TR20141. Either adapter can also be used wit
    view full answer...

  • Adapting 2012 Ford Van with 5-Pole Trailer Connector to Tow Trailer with 7-way and Electric Brakes
  • If you want the electric trailer brakes to be functional, you would need to install a brake controller and a 7-way trailer connector. You would also need to run the 12-volt trailer accessory power circuit. Our Brake Controller Installation Kit, part # ETBC7 includes everything needed to install a brake controller, including the adapter, connectors, wiring and zip ties. Due to the length of the van, you will also need some extra wire, part # ETBCXW. I would recommend a proportional controller,
    view full answer...


Info for this part was:


Expert Research:
Michael L

Expert Research:
Robert G

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Jameson C

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