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Want to connect a vehicle with a 7-pole round pin connector to a trailer with a 4-pole flat connector? This adapter does exactly that, bridging the gap effortlessly. It’s a perfect fit for a range of situations, making towing simple and hassle-free.
Towing in harsh weather? No worries! This adapter is built to withstand the elements with its impact and corrosion-resistant design. A special dust cover is included for the 4-flat end to help prevent corrosion, ensuring long-lasting use through all weather conditions.
With its straightforward plug-in design, setting up your towing connection is as easy as pie. It’s designed for anyone to use, so you can get on the road quickly without fussing over complex instructions or tools.
For those who need a straightforward adapter for simple towing tasks, this single-function adapter delivers on its promise. It's ideal for users who need a quick, reliable connection, making it perfect for everyday hauling needs.
No more struggling with firm or slippery adapters. This design incorporates an easy grip, allowing you to connect and disconnect with minimal effort and maximum ease, even if you’re wearing gloves or dealing with a heavy load.
Looking for peace of mind with your purchase? Rest easy knowing it comes with a 90-day warranty, so any initial concerns or issues can be addressed with ease and assurance, letting you focus on the road ahead.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today, we're going to be taking a look at part number 47405. This is the Hopkins adapter, 7 pole round pins to a 4 pole flat connector. This adapter is going to convert your 7 pole round plug with round pins on your vehicle to a 4 pole flat trailer connector on your trailer. We take a look at the overall link measuring from the back to the front. Just going to give some measurement, about 4 and one eighth of an inch. It's made from a nice, durable plastic construction so it's very strong and durable.
It's also going to feature a nice impact and corrosion resistant design. Over here on this end by the finger tabs, you're going to have the 4 pole connection, that's going to come with the dust cap, so this is included to protect the 4 way connections when the plug's not being used. Simply just slides over there. You're going to have the large finger grips that's going to allow for easier installation and removal of the plug. It's also going to feature the tab here on top, that's called a lineup of the groove on your 7 pole plug for easy connectivity. Really nice design, and again, this plugs in to the 7 pole round plug on your vehicle, and then it's going to allow you to have the functions needed to power the trailer lights on your trailer that has a 4 way flat connector on it.
That's going to do it for our review of part number 47405. This is the Hopkins adapter, 7 pole round pins to a 4 pole flat. .
They (7 pin to 4 pin adaptors) arrived in a very timely manner!
Came quickly, it was exactly the right adapter to hookup our older one to our new foldable Harbor Freight trailer Thank you!
I ordered the incorrect part. Your return policy is ridiculous. I doubt I will ever order anything from you again.
Worked like it should.
Worked as I expected with no issues. T hanks
Unfortunately, it does not fit my vehicle. It is too large in diameter. I should have measured that before ordering.
This adapter is only for round pins. If the 7-pin connector on your vehicle has flat blades instead of round pins, this adapter will not work.
I'll give it five stars because I expect it works fine, I just didn't realize I needed to check the pins. No fault of the part.
I was having a hard time finding this trailer adapter and found it on etrailer.com! Exactly the right pin to pin configuration. The economy shipping was fast too. I received the adapter in a timely manner. Thank you
Didn't work precisely on my application, but the existing wiring was made for a custom trailer so I had to make some modifications.
Item arrived in great condition DAYS BEFORE it was expected. Great company to do business with. Any trailer needs I have going forwarded will be handled through etrailer.com!! Best company I've EVER done business with.
I use this to adapt my tractor's power outlet to run a 12 volt sprayer. I just use the ground and light terminals. That way, when I turn on the Tractor's lights on the sprayer runs. Works great!
Plug and play for my project. LOL
My fault, wrong piece! Didnt know that there were different prongs! I need the 7 flat prongs with a 4 flat connection! Installed the wishbone wiring today, very pleased with that! Ran it all and connected to my new lights, been a long time coming, thank you so much
I bought a truck wired with a 7 pin trailer receptacle so I went to 2 different stores locally to purchase an adapter. Striking out twice, I checked etrailer.com and sure enough it was available. I made the purchase, arrived in a couple days and made a perfect fit.
Got here in a timely manner and was just what we needed to get our notill drill on the road safely and legal
This is a nicely manufactured and finished product, and comes with a cover for the 4-pin end of the plug. It is easy to use.
The Adapter DOES NOT WORK on the running lights! It does work on brake and turning lights. I tested the pickup Receiver for the Adapter and the pickup works ok, however looking at the "Adapter hole side, with the guide up" the Adapter tail lights connector is the 2nd hole to the left But on the pick is the 1st hole on the left on the 1996 Dodge Ram 2500. (factory equipped). How do I contact you all on this?
You had what I needed and it arrived quick, good job folks
Worked perfect for our 1993 Ford F-250 diesel. This is a 7 round to 4 flat accessory
Michael
8/10/2025
Why would you not provide corrosion resistant fasteners?
Nick S.
8/11/2025
The adapter worked well, and I use it regularly. A good buy for the price.
Dose what it's made for. Use it all the time :)
Excellent ease of use, Exact product and quick FREE delivery.
Good product, good people
Good plug came quick and pic is great
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
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Katrina B.
4/20/2022
It sounds like there might be a connection issue between the 4-pole to the adapter. We suggest that you test the 4-pole side of the adapter with the 7-pole connected to the vehicle. I have sent this information over to our customer service department for them to better assist you.