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Adapter 7 Pole to 4 Pole with Tester and Cover

Adapter 7 Pole to 4 Pole with Tester and Cover

Our Price: $11.41
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Trailer Wiring
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Shipping Weight: 0.22 lbs
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47345 - Single-Function Adapter Hopkins Trailer Wiring
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Great Prices for the best trailer wiring from Hopkins. Adapter 7 Pole to 4 Pole with Tester and Cover part number 47345 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (504)
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Hopkins Trailer Wiring

  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • Plug Only
  • 7 Round - Blade
  • Hopkins

If your truck has the connector on the left, and your trailer has the connector on the right, you will want this adapter.
30300 18004
Vehicle End Trailer End

Similar to 18142 and 30702

47345 Adapter 7 Pole to 4 Pole with Tester and Cover

Item # 47345

California residents: click here

Video of Adapter 7 Pole to 4 Pole with Tester and Cover

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

Video Transcript for Hopkins Adapter 7 Pole to 4 Pole with Tester and Cover Review

Randy: Hey guys. It's Randy here at We get questions all the time from customers asking us how they can get their 7-pole to work with different style connectors. What we're going to look at today is from Hopkins, and this is a 7-pole to 4-pole adapter. This is going to plug right into our 7-pole. It's going to give us the functions we need for a regular 4-pole plug.

Basically what that means is that we can run a 4-pole trailer connector just like this through our 7-pole plug by using this adapter.This is going to eliminate the need for us to modify our vehicle's wiring, add a separate 4-pole onto it. And it's also going to reduce the need for us to replace the plug on our trailer and switch it over to a 7-pole round or something like that. They plug in really nice and easy. There's a couple things that make this one a little bit different than what we're used to out of these adapter. One's going to be the lights that we see here.

This is going to give us signals and indicate to us that our running lights are working. Our left turn and brake are working, and our right turn and brake are working. If we hook up to our trailer, plug it into our truck, and the lights on our trailer aren't working, as long as these lights are working, we know it's not our truck. It eliminates 50% of the possible problem. And we can do the work on our trailer that we need to.Something else that I like that we don't always see on the adapters, some of them have them, some of them don't, but that's going to be a cover.

It's going to go over and protect our connection. Now you could leave this installed on the back of your truck if you don't use your 7-pole. And I recommend taking it out and throwing it in the glove box, something like that. We always recommend using dielectric grease, but if you're going to leave it installed, I highly recommend it.Basically we're going to put that on both sides of our plug. It's going to prevent moisture from getting in.

If we can prevent moisture, we prevent dirt from being built up in there. And if we don't have moisture, we don't have dirt, we're not going to have corrosion. Corrosion on our prongs on both sides can lead to a lot of lighting failures on our trailer. Using a little bit of grease, keeping it on there, it's going to prevent most of that.Now as far as installation, just going to lift up our cover, then we're going to slide in our plug just like that. At that point, we're going to take our 4-pole, plug it in like that. We're going to be ready to head down the road. As you can see, that's a really quick and easy solution to a common problem. Now to show you how the indicator lights or the LED lights on there are going to work, we'll turn on our headlights. You'll see the light come on. We've got our left turn signal, our right turn signal. And then they'll both come on for our brakes.Now I really like this adapter. It's more compact than some of the other ones I see. And I also like that it has the cover and it has the lights. If I was looking for a 4-pole only option, I'd definitely choose that one. If you wanted to upgrade that slightly and have some more adaptability available, I might go with 78118. That's going to be a 7-pole to a 5-pole adapter. That fifth pole can be important if you want to run reverse lights on your trailer. So when you hit reverse in your truck, the lights come on in the trailer. You can see where you're going. Or in a marine application, not really like this, but some of them have a surge coupler here on the front. That surge coupler as it squeezes applies brakes on the trailer. So in that application if you back up without an electric lockout or a manual lockout, the trailer won't go. The brakes will be applied.You can also use that fifth pole for your electric lockout, so when you hit reverse, your trailer will back up. Outside of that, I think this would be an excellent decision. As far as how it's made, how it fits together in the fit and finish, Hopkins has done a really good job on all the seams. There's no gaps. There's no cracks. Really no over mold on the plastic. You can tell they've really taken their time to make a very good product.

Customer Satisfaction Score:

Customer Reviews

Adapter 7 Pole to 4 Pole with Tester and Cover - 47345

Average Customer Rating:  4.8 out of 5 stars   (504 Customer Reviews)


Great hitch, perfect fit and quick install on my '17 Nissan Frontier S King Cab.

The Factory Tow package light install is outstanding for a plane-Jane truck like mine. Easy install. My only complaint is that it doesn't come with a mount bracket. I picked one up local, but decided to mount the connector in the steP-bumper for more protection.2" hole saw is perfect, and #10 stainless screws with washers and lock nuts.

Adapter with the test lights is perfect for making sure everything is working.

Great set up, about 1 hour total install time start to finish.


Product worked as advertised. Assist from Tiffany to get the correct plug was great. She worked to get my issues sorted out and resolved with a positive attitude and friendly demeanor. Smooth process and had my part in 2 days. Awesome!!!

works as advertised. no issues...
Jim - 08/12/2022


Item arrived quickly and works as descr ibed.

The adapter works fine and Im glad I have it.
Robert - 11/13/2022


The price I got was excellent compared to what the dealer would charge. Thanks to the etrailer installation videos, i was able to do it without difficulty and this is the first time i installed an item like this.


Easy install, very good quality and it works just fine.

Still working just fine......very happy.
Tom M - 08/20/2022


I found this to be the best model due to the l.e.d indicator lights. The other options were the red or blue glowing adapters or none at all. It works perfect and appears to be very well made. Converts a 7 pin plug (1 center 6 in a circle) to a 4 pin plug (three female one male).
Thank you again etrailer for having such a large selection of products and excellent customer service!


I ordered these items and I no time at all they arrived at my front door! I was able to track the items, time, place, arrival and departures. As far as the quality of the equipment, extremely well made and top notch functionality. Some of the parts were heavy, but well packaged for safety. I highly recommend this company.

Still working like the day I bought it.
Mark D - 10/24/2021


Great device


I’ve used etrailer for all of my hitch and trailer needs for years now and I think they’re terrific. Any questions are always answered accurately by their professional staff, and the customer service has been outstanding! I recently had a shipping issue that was quickly handled and resolved in almost no time at all.
Thank you to Teresa J for taking such good care of me!


I’ve had the 7 pole adapter on my trailer for over a year. It matches up perfectly with my Nissan Frontier. A quality product that I wouldn’t hesitate to purchase again.


Does what it is supposed to do. Working great


I have an older utility trailer, and this item made it possible to hook it up to my newer truck without doing any wiring!

Ajo - 12/14/2021


Good, item.


The cover and tester are great features of this product


I have use the adapter a couple times and it has functioned well.

I have had no issues with the adapter
Peter A - 04/11/2022


Quick and inexpensive way to convert a 7 pole to a 4 pole. The built in tester is an added bonus to ensure your wiring is correct.


they work correctly for the application intended for.


Worked great, matched up with the trailer light receptacle on my Kia Borrego like a charm. Very pleased.


I used this wiring kit with the Honda hitch. I would recommend installing the 7-way receptacle to the mounting bracket on the hitch prior to installing the hitch to the car. You will need to drill holes in the mounting bracket on the hitch since the ones on the receptacle don't line-up with the ones on the bracket. I used four stainless steel screws and nuts with nylon inserts to connect everything together. The rest of the installation went just like the video, easy.


This connector is perfect when you already have just the 7 way on your truck. I HIGHLY RECOMMEND this connector, it's a great way to go if you don't want to install a connector that has both. Buy it you won't be sorry!!!!

It is a great tester
LARRY W - 09/13/2021


Incredibly easy to install yourself and works flawlessly. Highly recommended….


This was just what I needed for my new used pickup to hook up my trailer.


The review was two stars, and the comments were that the LED lights do not work with my vehicle as the device is apparently not compatible with a 2017 Mercedes GLS. I believe before the vehicle will energize the turn signal, brake, or flasher circuits, the Mercedes needs to sense more resistance as would come from incandescent trailer light bulbs . Recommend that the manufacturer put in resistance in parallel with the LEDs to simulate the load of incandescent bulbs.

Thank you for your review. This particular adapter does have a hard time sensing the load of LED lights because they draw such little power. I recommend 7-Way to 5-Way4-Way Trailer Adapter for Vehicles with Lamp-Out Sensors part TR20141 which is designed specifically for Audi, Mercedes-Benz, Porshe, and Volkswagen vehicles with the factory tow package.
-- Etrailer Expert Heather A - 02/23/2021


The ground pin broke out of my original 4 pin so this was my only fix without replacing everything. It has been well used and has never let me down. Tip of the hat to Customer Service for recommending it.


Part fit perfect and works good!

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