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In-stock alternatives that can ship today
Transform your towing experience with the Optronics 7 to 5-Pole Flat Wired Adapter. This device effortlessly converts a vehicle's 7-way blade connector into a 5-way flat pin connector, providing seamless connectivity for trailers with different wiring systems. With a generous length of 16 inches, it bridges the gap between mismatched connectors, making your towing setup more adaptable and versatile for any journey.
Struggling with trailer brakes locking up during reverse maneuvers? The built-in blue wire function on the 5-pole connector of this adapter is a game-changer. It ties into your vehicle's reverse light circuit, sending a signal to unlock trailer brakes when reversing. This feature particularly benefits boat trailers with hydraulic brakes, ensuring smoother and safer backing.
Designed to withstand the toughest conditions, the adapter boasts heavy-duty molded construction. It's sturdy and robust, making it incredibly resilient against wear and tear. Ideal for those who tow frequently, its quality construction assures that this adapter will endure the elements and provide consistent performance over time.
When trailer wiring is just shy of bridging the gap, this 7 to 5-pole adapter offers a convenient solution with 16 inches of wire. Whether dealing with varied vehicle and trailer configurations or simply needing that extra reach, this extension ensures a secure and reliable connection, preventing plug disconnection during tight turns or complex maneuvers.
Flexibility is key, and this adapter doesn't disappoint—its 5-pole end accommodates most 4-pole trailer connectors. Users can easily trim surrounding plastic if necessary to ensure a snug, functional fit. This versatility means fewer hassles and more options when dealing with a variety of vehicle and trailer setups.
While it’s not technically waterproof, the adapter provides excellent resistance against moisture. Using dielectric grease on the connectors and adaptors will repel moisture, ensuring a consistent and secure connection even in wet conditions or when launching boats. No more worrying about short circuits during your adventures by the water.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
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.
Good
fast delivery, great price.
Haven't used it yet, but it looks like it is very well made. I will let you know after I put it to use.
Quick ServiceOnce again, etrailer.com has delivered an excellent product with the quickest turn around times I have found. If you are looking for great products and customer support/satisfaction, you won't go wrong with etrailer.com.
Well made. Great extension from truck to my boat. Adds an additional 20" of wiring
I needed a different length adapter to connect trailer to new truck. This one fit perfectly. High quality; all pins make secure connection.
High quality, good price, exactly what I needed
Great quality, good price!
Perfect for what I needed
Works good
Great product for a reasonable price.
Right out of the package..plug & play & the extra extension..works great..heavy duty made
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!
Chris W.
4/6/2019
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.
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.
Russ
1/26/2018
Still very happy with the wire harness. Thanks for following up this isextraordinary customer service ...
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.
Dennis
5/29/2018
After a year its working just fine. Very happy with this purchase.
The light and rubber boot was easy to put in a worked well, but the boot did not fit as tight as I would have liked when the trailer was empty and bounce a lot the boot and light fell out, have reorder a new boot and light will put silicone on the boot this time
Eem
6/26/2021
Great when I reordered the second time I put silicone around the rubber seal and then put in the light as worked perfectly
Excellent and fast service
Used the adapter multiple times! Not much to say except works great! Extremely satisfied. I can however not say enough about etrailer's customer service. They are awesome plain and simple. Thanks for following up to see how I liked the adapter!
Mike S.
4/1/2021
Product works great! Extremely satisifed.
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.
Frank F.
3/30/2015
After using this adapter for a year, it still works great. I have had no problems.,
Nice adapter for my rv to motorcycle trailer. Easy to use and works great.
Ordered on Thursday and received on Saturday. Great service!
Perfect fit
Some of the smaller trailers I haul from time to time do not have a harness long enough to reach all the way to the bumper of my 3/4 ton pickup. This pigtail perfectly solves that problem, without adding too much excess wiring. It includes the fifth pole for some boat trailers to release the pressure brakes while in reverse.
Bought this “connector” for the purpose of providing my vehicle’s tail light signals to my boat trailer’s
tail lights and turn signals. The connector that I received from ETRAILER is of high quality and exactly
what I needed to accomplish my intended purpose. Very happy with this product.
First time using this device it would help to include some general directions to help new users like myself. Had to call etrailer for additional information on this adapter. This did help answer the question I had. Thanks Quinn, I believe is the one that helped.
Jenny N.
4/26/2022
I recommend watching the video review that I have linked below.
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Rich
4/12/2025
After a year of use this product is working as expected. Well made and providing additional length to my wiring.