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.
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. Today we're going to be taking a look at an adapter plug. We get questions a lot about how people can convert a working 7-Pole on the back of their vehicle to work with a 4-Pole or 5-Pole trailer. That can have a lot of needs, either a trailering in its own. Maybe you've got a cargo carrier that has lights on it. Maybe you just got a little hitch cover that you want to illuminate at night, if it's a plug-in type.
This can really help take care of all of those needs.Basically this is going to provide us either a 4-Pole connection or a 5-Pole connection. The 4-Pole connection is going to offer your ground, it's going to have running lights, left turn signal and brake, right turn signal and brake, and the 5th Pole is for a reverse signal. That's going to be really good for marine trailer applications, when we need to lockout our surge coupler so we can back our trailer up. Or, also, if you plan on adding lights to your trailer. Maybe you're in a dark area and you can't see where you're backing your trailer into.
Throwing a couple lights on the back and wiring it so that signal through your Pigtail. Every time you hit reverse on your vehicle, lights will come on the back of the trailer and give you a good way to look around.Now, all in all this has a good, solid feel to it. It's not as heavy as what I felt out of some of the other 4- and 5-Pole adapters here, and it is a split case design. You can see it has that line that goes around, they're screwed together. Some of these are going to be molded.
I think the moldeds are a little bit heavier. They seem to be a little bit more rugged, overall. I like this adapter. I think it's going to work out fairly well. The part that fits into your 7-Pole is going to be brass.
It doesn't have a nickel coating on it. That can lead to a little bit of corrosion issues, but we recommend with all adapters that you use dielectric grease. This is going to give us a barrier and prevent moisture from getting in there. Without moisture, we don't have to worry about that dirt settling in there and causing corrosion down the road. So that's kind of a give or take with me. I'm going to grease anything I use, so I really won't have to worry about it.If you have a shrouded 4-Pole connector, meaning that your ends don't stick out like what our 4-Pole connector do here. It's got more of a black plastic wrap that goes around it. You'll have to trim the side of it as we fit these together. Let me show you here. With that 5-Pole sticking out there, as we stick that on the side of that cover, it is going to interfere. So you'd have to trim that side out. When removing it, ler me put this all the way in. As we remove it, the insert in here tends to move a little bit. You can kind of see how that moves.Now as far as customer reviews you, people really like this. They haven't had any issues that causing any kind of a problem. I like that it's got a nice handle on there. The one thing I think this lacks that we see on some that are very comparable to this one, is going be a tester. Going to be a few red lights that'll come on and indicate to you if you've got a problem, your trailer lights aren't working. It can verify for you that your truck's lights are. So you know your problem's on the trailer side, you basically eliminate half of the problem in the equation.As far as the installation goes, going to be just like a 7-Pole plug. We've got our tab on the top here. That needs to go behind the tab on the door, right in there. Then you'll bring your 4- or 5-Pole in, and that's simply going to plug in. At that point, you've got the lighting and the power heading back to your trailer, so you should be in good shape.Now as far as if I would own this particular adapter versus some of the other ones out there, I'd have to say that I think I'd go with a different one. I'd go with one that had a little bit more option to it, kind of like the Reese here. This is product number 78118. Basically, it's going to be a little bit larger. Both of them are easy to install, but I like the fact that this one gives me a 4-Pole and a 5-Pole option. So regardless of the type of plug I'm using, it's going to go in there without modification. And it does have the LEDs in there, that are going to tell me if my truck's working, if I have a problem. So, all in all, while I think this is a good adapter and it's going to work out in a lot of situations, I think I'd own the Reese before I'd own this one.
Average Customer Rating: 4.9 out of 5 stars (129 Customer Reviews)
Received product as expected (again). etrailer has proven to have items needed and provided reliably without any issue. 211180
Dan M - 08/05/2016I don't often write reviews, but etrailer's service is so good, I have to! Great product and service. BD 369088
Perfect 589854
product was as described in catalog. completely satisfied. 573255
Looks good, I haven't tried it out yet. 364110
Jack - 04/07/2018Great product at a great price. Fits perfect. Even has a protrusion that the cover of the truck plug leans against so the adapter cant be pulled out of the plug on my 2013 F150. 431321
John T - 09/11/2018This converter does exactly what I needed it to do ---- convert my 5 pin flat connecter on my boat trailer to the 7 pin connector on my new truck. It's keyed so even I can't insert it wrong! Perfect product for my need! 380735
Mark G - 05/15/2018Much better than I expected. Delivered very quickly and met my needs to convert a 7 pin round Polack connector to a 5 pin boat trailer wiring harness. High quality molded plastic housing means this will last for a long while. I bought two both a 5 pin and 4 pin conversion. Both were priced right and I found them to be the best value I could find. Interesting my 4 pin unit had a cover for the 4 pin connection yet the 5 pin did not. 364220
etrailer continues to have great product selection and knowledgeable staff to ensure my needs are met. My boat trailer has a 5 flat plug with the 5th wire unused as I do not have trailer brakes. I had been using an 7-pole to 4-flat adapter and all my light functions worked. However, I was not happy that the spring loaded door did not fully lock in the adapter in place as it partially hit the 5-flat trailer plug. By using the proper adapter (7-pole to 5-flat), the spring loaded door fully locks the adapter in place to ensure it will not fall out when driving down the road. The product was shipped and received very quickly. etrailer will continue to be at the top of my list for such purchases. 289360
Bill G - 08/30/2017Have yet to hook it up electrically to test it but physically fits my 2019 VW Atlas perfectly. 704364
I'm extremely satisfied with the product and service. I run an automotive repair facility and it is very important that the products we use are factory fit. Etrailer did a great job helping us decide what we need and getting it to us promptly. 691623
fit exactly as described. 679629
Great adapter, my boat trailer has a reverse lockout that requires the extra pin for the reverse sensor to allow me to backup. 659023
I’m very happy with this product as with everything I order from etrailer. This is my go to site for any thing to do with trailering parts. Good prices and good choice of different brand name products. Usually I find exactly what I need. 657999
Works as expected - reasonable delivery...........as always! 652549
Works Great 651218
Just what I needed 650842
This product works great. I will give it a 5 star ratting. 650333
Just the part I needed at a good price. 646456
Product works exactly as expected. No c omplaints. 634432
Good price, still works great, great service. Why look anywhere else. 630840
Product works well, make sure you take if off when storing your trailer because people will want your adapter! All they have to do is order their own from etrailer! 615100
works great 614400
Works as expected. Have a tongue brake activator on my boat trailer that goes off when going into reverse to launch the boat and park. 592888
Good fit and does the job. 557741
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