Adapter 4-Pole to 7-Pole and 4-Pole

Adapter 4-Pole to 7-Pole and 4-Pole

Item # 37185

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Hopkins Wiring - 37185
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  • Wiring Adapters
  • Multi-Function Adapter
  • 4 Flat
  • 7 Blade
  • 4 Flat
  • Plug and Lead
  • Hopkins
Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory. Lowest Prices for the best wiring from Hopkins. Adapter 4-Pole to 7-Pole and 4-Pole part number 37185 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


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  • Reviews (343)
  • Q & A (1610)
  • Videos (35)
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  • Used (1)
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Hopkins Wiring - 37185

Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory.


Features:

  • Adapter converts from 4-pole wiring on your vehicle to 7-pole round plug and 4-pole flat wiring for trailer side
  • Adds additional wire leads for brakes, power, and accessory wiring
  • Wire functions:
    • White - ground
    • Blue - brake
    • Black - hot lead - 12 volt power supply
    • Purple - auxiliary
  • Mounting bracket included


Specs:

  • Connector measures 3" x 3"
  • Distance between vehicle mounting holes: 2-3/16"
  • 90-Day limited warranty


product detail

Wire Functions:
White: Ground
Blue: Brake
Black: "Hot" Lead - 12V power supply
Purple: Aux. - Reverse Lights etc.







47185B Adapter 4-Pole to 7-Pole and 4-Pole - Hopkins # 47185B, TAP # 37185






Video of Adapter 4-Pole to 7-Pole and 4-Pole


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




Video Transcript for Hopkins Wiring - Wiring Adapters - 37185 Review

Today we're going to be reviewing part number 37185. This is an adapter that's going to convert from 4 pole wiring on your vehicle to a 7 pole round plug and 4 pole flat plug. This is from Hopkins Wiring. It's going to provide additional wire leads for your brake, power, and accessory functions. The mounting bracket is included. That's designed to hold the socket up out of the way protecting the wiring and making for easier connections.

The connector itself is going to measure three inches by three inches, and the adapter is designed to plug into your existing 4 pole using this plug here. Then it's going to have 4 more wires that are exposed. Your white wire is going to be the ground wire. It's going to ground to your vehicle. The blue wire would carry the output from a brake controller.

The black wire would run to the vehicle battery to provide power for any trailer mounted accessories requiring twelve volt power. Then the purple wire is typically used to power trailer mounted reverse lights. If you don't need to use the purple wire it can be capped off and bundled up out of the way. All the exposed wires have easy connectors on them, so the black, purple, and blue wires are going to have butt connectors, and then the white wire's going to have a ring terminal. It's going to allow you to easily connect it for a nice, secure ground connection. The connection point here on the back of the socket, that is sealed to be protected against the elements.

The white and purple wires are going to be the longest wires. I do have them already bundled up but I did measure them. The white and purple wires are going to measure thirty-six inches in total length. Again, it's going to come with a mounting bracket and all the necessary hardware to mount the bracket and to get the socket mounted to the bracket. You can see those two little packets of hardware. Here on the front of the connector, for the 7 way round connection, it's going to feature a spring loaded lid.

This cap is going to protect the connections when they're not in use from the elements so it's going to keep any dirt or grime off the connectors. That is spring loaded so it is going to shut automatically when it's not in use. Then right here on the 4 pole, or the 4 way flat, it's going to have a nice little dust cap that fits over the connector. Again, that's just going to protect it from the elements, keeping any dirt, grime, or moisture out of those connection points. That's going to do it for today's review of part number 37185. This is the adapter that converts from 4 pole wiring on your vehicle to 7 pole round plug and 4 pole flat plug from Hopkins Wiring. .


Customer Reviews

Adapter 4-Pole to 7-Pole and 4-Pole - 37185

Average Customer Rating:  4.8 out of 5 stars   (343 Customer Reviews)

Adapter converts from 4 pole wiring on vehicle to 7-pole round plug and 4-pole flat. Additional wire leads for brake, power and accessory.

- 37185
by:

Another great product as always. Exactly what i needed. Thank you etrailer 600088



- 37185
by:

Works as advertised 567566



- 37185
by:

I haven't installed chains or boat trailer plug and 7 way cord yet.I would like to say that etrailer's quick shipping is second to none!!I buy a lot of things on line like ebay,but I am really impressed by your U.S map tracking system.Before I bought my items I emailed you to make sure of the fit,Your response was fast. 326755



- 37185
by:

Just what I need to tow an RV trailer. Also has a four flat connector. Very easy to install on the 18136 bracket. 63719



- 37185
by:

I use this matching unit to replace the broken cover(plug lock) parts & spring on my hard wired connection. It's a good product unless/until the plastic hinge breaks(especially if one backs into something). It's less costly to strip/swap parts than a new plug + rewiring. Just wish they made a metal version, or could get select "parts". 81184



- 37185
by:

Provides a 4 pin and 7 pin connector in one compact package. Rear housing is considerably shorter than most, so it's less likely to interfere with the hitch cross member. Includes a mounting bracket, or works great with Curt C58000 bracket. Only complaint is that the 12V wire is quite short, so a crimp connection needs to made very near the connector. Be sure to seal that connection against corrsion. 458708



- 37185
by:

If you have 4-flat and need RV, this is the connector for you. Easy to hook up (unless you need to wire in the brake controller). I needed to convert my Corolla 4-flat to 7-pin RV to match my VW Vanagon and motorcycle trailer with newly installed brakes. I haven't hooked up the brake controller yet on the Corolla but I needed the plug compatibility 'til I do. 217850



- 37185
by:

I installed the ETBC7 kit a year ago, and a recent trip wiped the plug off while crossing a stream. This was a perfect replacement for my damaged plug and easy to install. 94452


Comments

It is working fine. No problems.

Ron J - 08/13/2014

6242

- 37185
by:

This item was received without instructions. The 4pin is easy enough to plug into any other 4 pin. Once you ground the white lead the brakes and signals work well. I dont know what the blue or purple wires are for, as instructions did not come with this item- wiring diagram either. Black lead I assume is power, to be connected to a hot lead, for internal trailer lights, idk. Otherwise, I am happy. 527702


Comments

The black wire is the power wire it needs to be connected to the positive side of the battery by using a 40 amp circuit breaker. If you are using your reverse trailer lights attach the purple wire coming out of the 7-way connector to the your reverse light wire. The blue wire is for electric brakes its going to go to the output wire on your brake controller. There should be a black wire coming from your brake controller that will connect to the positive side of the battery as well using a 20 or 30 amp circuit breaker. The red wire from the brake controller will connect to the cold side of the brake switch above the brake pedal. The white wire on the brake controller grounds to the negative side of the battery. I have attached help articles to assist you.

-- Heather A - 07/10/2018

40767

- 37185
by:

I installed this along with a brake controller on my 1997 Nissan Pathfinder earlier this year and it was easy to install and the instructions were nicely detailed. I do have some mechanical skills so I would say you need to have some knowledge of electronics, but if you do some careful planning and study, most people could handle the installation. I toasted my plug on some rocks on my last outing so I purchased this to replace my original one. It's a great product. As always, etrailer is very helpful and their knowledgeable staff make it a pleasure to do business with. 259017



- 37185
by:

Great product fast shipping.. used on 2004 Lincoln navigator. 479026



- 37185
by:

Hitch arrived in a timely fashion. Installation was a breeze and the fit and finish were perfect. Wiring harness hooked up perfectly. etrailer made the whole process simple. I just ordered another hitch and harness for our new car. 379041



- 37185
by:

Wow after Charles great advice this was so simple to install, YouTube video was point on and the hardest thing was finding the reverse wire. Thanks so much for a good product and excellent advice, here is the pic after install! 500490



- 37185
by:

Nice quality adapter harness. I would highly recommend etrailer.com 134651



- 37185
by:

Installed on a 2010 Ridgeline. Just what I needed at a great price. Install was a breeze. etrailer is the best place to find all the stuff that auto dealers rip you for. Good quality and the customer service is above reproach. 501788



- 37185
by:

Absolutely Superb Service! On the 23rd of September at 10:10 a.m., I ordered a brake controller and several other items from the etrailer.com website. By 12:16 p.m. of the same day, I received a notification from etrailer that the order had shipped. The complete order arrived at about noon on the 26th. Ordering on the website was easy. All items were described very clearly and pictures were provided for them. The service at etrailer is absolutely superb. I would recommend this company, without hesitation, to anyone needing trailer parts or accessories. 324676



- 37185
by:

Item 37815 was easy to install. It took me only about 20 minutes in 20 degree weather--on my back in the driveway to complete including drilling holes for the bracket. I plan on using the trailer tow items to pull a double axle car trailer. Although I am very mechanically inclined, your videos and articles made the job a breeze. Your customer service and e-mail support were also excellent. You have an excellent selection of items that appear to be av ailable with no delay. I would recommend your company to anyone with confidence. 30036



- 37185
by:

Product was shipped and arrived sooner than expected. Mounting plate is a little thin and flexes quite a bit but shouldn't impact longevity as long as your careful when inserting plug. Unit is made of high impact plastic and wires are sealed. Don't see any reason why it shouldn't last a few years. 4 way plug didn't fit into my stock 4 way on my truck. I had to remove excess rubber in order to make it fit tight. Not a big issue but one should expect some standardization among 4 way plugs. Ground wire (white) is separate from the 4 way plug. Not sure as to why it was built that way but still functioned well. Regardless of my concerns, item was installed and up and running in about 20 minutes. I would buy again. 133653



- 37185
by:

After taking my new SUV to the dealer to have it wired to tow my camp trailer, I was told it couldn't be done. They refused to see that the vehicle had the tow package and to help me get the last few critical pieces to tow. I guess they were too busy! So I tried a reputable RV shop that I have worked with before and they quoted me over $400 to custom wire my SUV. I knew there had to be a better option. Looked online and found etrailer. They made it sound easy. I purchased: Tekonsha PowerTrac Electronic Brake Controller (39523), Tekonsha wiring adapter (3035P) and 4 pole to 4 & 7 pole adapter (37185). It all arrived quickly and after following the instructions online and even with average mechanical skills, I was good to go in about one hour. Saved about $300 and whipped it out that fast. Why consider any other option. I am extremely satisfied. 59917



- 37185
by:

The product itself is very well made. The 4-pin connector is molded into the product and very sturdy. The 7-pin connector is held closed by a spring and has a foam gasket to keep water out. The 4-pin wiring is only about a foot long, and the additional 7-pin wiring is a bit longer. I do not have a brake controller (but do borrow a trailer with the 7-pin wiring), so I removed those wires. I also hard-wired all the connections, so I can't speak to the quality of the 4-pin vehicle connector. The mounting bracket is thin steel, which worked well for me, as I had to bend the mounting plate to make it work for my installation. The paint on the mounting plate appears to be high quality as I bent the plate and banged it around quite a bit during install and did not nick the paint. The plate is drilled so that is can be mounted with the 7-pin hinge facing up, down, left or right. The hardware is zinc coated, so it should hold up well to the weather. I went ahead and replaced it with SS to make sure. I also replaced the standard nuts with SS nylon lock nuts to make sure nothing would back out due to vibration. If you plan on using the supplied hardware, I would strongly suggest Loctite on the mounting nuts. I installed this on a CX-5 with hitch # 87623, wiring adapter # C56011 and hitch cover # I-728. Over all a very clean installation. The connector is completely hidden inside the bumper, but easily accessible. 72768



- 37185
by:

This kit is fine for what it is. It is not designed for those who have no existing wiring in the vehicle. You will need ETBC7 if you want an all included kit that provides added wires and fuses for customers who don’t have trailer break or reverse light wiring already installed. If you don’t need the extra material, this is a great kit to turn a 4 pin into a basic 7 pin connector. Also, be aware, you need to look and see where you want to mount the connector. You may need an addition adaptor plate to mount the bracket to the trailer hitch if you don’t have a good location available. 541243



- 37185
by:

2018 wrangler unlimited Sport S. Without trailer wiring. Completed installation today. Used a 4 flat along with a 7 pin converter. Works and fit perfectly. Very hot day and work slowly and carefully. Very satisfied . Great folks at etrailer. Great products, great quality and prices. I'm a several time repeat customer and couldn't be more satisfied. 4 pin harness Was a 56407 and the 7 pin adapter was a 37185. 539606



- 37185
by:

Easy to install, video was a big help. I like it also has a 4 pin connector as well. 576441



- 37185
by:

Great product, fast shipping, excellent help by a person that was knowledgeable on the product. would buy from again. 575053



- 37185
by:

Works great. Very easy plug and play in stall. 572889



- 37185
by:

Jack worked as described, though i did not wire it up myself. 571569



- 37185
by:

This does not actually qualify as plug and play. The 4 way connector is exactly what is furnished by Ford, therefore modification is necessary. This is a great idea and to have the flexibility to utilize 4 or 7 way connections is exactly what I was looking for. Better product description would probably eliminate any negative criticism. Although, I will state that this is my last purchase from Etrailer as all 3 items did not meet my expectations. 571123



- 37185
by:

I was able to install this plug directly into the bumpers factory blank. This made installation a breeze. The whole process took me about an hour, including hooking up the charge wire and electric brake line that was provided with my set up. I couldn’t be happier 568906



- 37185
by:

I DO A LOT OF AFTERMARKET PART ORDERING ONLINE. IT IS ALWAYS NICE TO GET ON A SITE AND BE ABLE TO EASILY FIND WHAT YOU ARE LOOKING FOR, ESPECIALLY WHEN YOU DO NOT HAVE A PART NUMBER JUST A PICTURE AND IN SOME CASES THERE IS NOT MUCH OF THE PIECE LEFT SO IT MAKES ORDERING REPLACMENT PIECES DIFFICULT. MY TIME WAS WELL SPENT AND EASILY FOUND AND CHECK OUT WAS A BREEZE FOR A FIRST TIME SHOPPER ON YOUR SITE. THANK YOU TRACY WITH CALIBER COLLISION CSPG #816 628887



- 37185
by:

Works as advertised. No complaints 622060



- 37185
by:

After a year of use I would still recomend this kit and ordering it from etrailer. I was able to install it myself using their instructions and videos. You can buy with confidence here. 619429



- 37185
by:

Thanks for checking back. I'm very satisfied with the products that I purchased. 619398



- 37185
by:

worked great and fit exactly into the bracket that was already on my 2004 Grand Cherokee. My only dislike was that it needs its own ground source rather than using the ground pin on the flat 4 that connects to it. 615958



- 37185
by:

I was very impressed with the outstanding customer service that was provided by etrailer. I ordered a different product and later found out that it was out of stock. Carol from trailer called me directly to provide me with options. I was able to exchange for another product which she sent out immediately. Carol tracked the package and then sent a email first thing this morning Product looks great actually better than expected... GREAT JOB! 615117



- 37185
by:

Like the products, easy to install. 611154



- 37185
by:

Exactly what i was looking for. 609124



- 37185
by:

Great product. Having access to both a flat four and a seven pin has been very helpful. 607868



- 37185
by:

works great, thanks 597415



- 37185
by:

Recently I needed to install an adapter from 4 way flat to 7 way and 4 way. After over an hour on the internet I ended up on etrailer.com. Here I found the adapter (several options) and associated installation supplies needed. All item were delivered quickly (sooner than the estimate) and were just as advertised. The website also provided several helpful videos on installation, etc. For any future needs of trailer supplies etrailer.com will be my first stop. 592510



- 37185
by:

only complaint is that no instructions came with this part. I had to look online on your site to see what each wire is for. 584371



- 37185
by:

Worked great 583902



- 37185
by:

Very heplful 583612



- 37185
by:

I have used this trailer hitch and its wiring package without a problem. the last time I pulled a trailer it was heavy enough to slow me down to 35mph when I was going up an on ramp. my last trip was over 300 miles and had no problems 578241



- 37185
by:

Superb quality product. Silly simple installation. Took about 1 hour. Received product within a few days as promised. etrailer is excellent and highly recommended. No need to waste time shopping other sites. 565358



- 37185
by:

Great service. My questions were promptly answered as which wiring kit would fit my 2004 grand Cherokee without having to fabricate wire connectors and such. They gave me several options and explained the differences between them. It made my decision easier . I received my kit sooner than i expected. I haven't installed them yet, because I still have to put the hitch on, but I am sure it will be basically a plug and play deal. I would recommend etrailer to everyone just in the service alone. Thanks guys. 564730



- 37185
by:

Works excellent ! 563243



- 37185
by:

Great service, fast delivery, good product. Very Happy doing business with etrailer. 563075



- 37185
by:

Worked great. 560555



- 37185
by:

Excellant in all ways 560478



- 37185
by:

Easy install and great product. Priced right and super fast shipping. 559399


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Ask the Experts about this Hopkins Wiring
Do you have a question about this Wiring?


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  • How to Wire 12V Battery in Enclosed Trailer to Power Trailer Lights Independent of 7-Way Connection
  • You are correct in your description of how to wire in a new auxiliary battery in your enclosed trailer. You will take the 7-Way's 12V power feed and route this to the positive terminal on the auxiliary battery, and you will ground the second battery to the trailer frame, as you described. You might refer to the linked article on trailer wiring to see the usual wiring configurations on trailer connectors. If you want to protect your vehicle battery from accidental discharge (such as if...
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  • The 12 Volt auxiliary terminal on your 7-way connector can be used to keep the battery on your trailer charged. You will need to run a 10 gauge power wire like # 10-1-1 from the 12 volt auxiliary terminal on the 7-Way trailer connector on the trailer to the positive terminal on the trailer battery and ground the negative terminal of the trailer battery to the trailer frame. This will allow you to maintain a charge on your trailer battery, it will not charge the battery from a discharged...
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  • Adding a 7-Way Trailer Connector to a 2010 Ford F-150 with Factory Installed 4-Way Flat Connector
  • To convert the factory 4-Way flat trailer connector on the back of your 2010 Ford F-150, you will need Adapter 4 Pole to 7 Pole and 4 Pole, # 37185. You will plug the factory 4-Way into the back of the adapter and hardwire the remaining 4 wires. The white wire gets grounded to the vehicle frame. The blue wire on the adapter carries the brake controller output voltage, and the black adapter wire carries the 12-volt accessory voltage for any trailer mounted accessories that might need...
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  • In order to install a 7-way trailer connector on your 2017 Ford F-150, you are first going to need to install a 4-way trailer connector and then a 4 to 7-way trailer connector. For this, I recommend using the Hopkins Plug-In Simple Wiring Harness part # HM11140735 and the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole part # 37185. The 4-way harness will be a direct plug and play option whereas the 7-way will require you to make two wiring connections. The two connections needed for the 7-way...
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Used Items Available
RU-18-35-00411219

Condition: Missing Parts

Notes: Missing the mounting hardware for the bracket, otherwise new and unused

Our Price: $23.71

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Info for this part was:

Test Fit:
Joe V
Photos by:
Theodore B
Expert Research:
Jackie C
Expert Research:
Michael L
Video Edited:
Zack K
Expert Research:
Sarah L
Video Edited:
Andrew K
Expert Research:
Robert G
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Video Edited:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Jacob T
Expert Research:
John H
Updated by:
Adele M
Expert Research:
Brandon M
Video Edited:
Andrew L
Expert Research:
Adam R
Video by:
Kathleen M
Video Edited:
Dustin K
Test Fit:
Shane T
Expert Research:
Lori W
Expert Research:
Jeffrey L
Video by:
Alan C
Video Edited:
Sue W
Test Fit:
Randy B
Video Edited:
Chris R
Test Fit:
Joe B
Updated by:
Sarah W
Test Fit:
Jared G
Updated by:
Alexander C
Video by:
Zach D
Test Fit:
Brent H
Test Fit:
Shane H
Video by:
Jonathan Y
Updated by:
Hannah L

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