Adapter 4-Pole to 7-Pole and 4-Pole
(622 reviews)
Price: $55.31
In Stock
Adapter 4-Pole to 7-Pole and 4-Pole
Item # 37185
Retail:$65.51
Our Price: $55.31
You Save: 16%
In Stock
- All Info
- Reviews (622)
- Q & A (0)
- Photos
Hopkins Trailer Wiring - 37185
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- 7 Round - Blade
- Plug and Lead
- 4 Flat
- 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.
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
Wire Functions:
White: Ground
Blue: Brake
Black: "Hot" Lead - 12V power supply
Purple: Aux. - Reverse Lights etc.
Note: If you run the hot lead (black wire), you will need a circuit breaker, for example 9510 (sold separately), between the adapter and the battery itself.
47185B Adapter 4-Pole to 7-Pole and 4-Pole - Hopkins # 47185B, TAP # 37185
California residents: click here
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
- Wrong item was ordered
- Product did not meet expectations
- etrailer mistake
Customer Reviews
Adapter 4-Pole to 7-Pole and 4-Pole - 37185
Average Customer Rating: 4.8 out of 5 stars (622 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.by: R. Fulcher07/10/2023
Really nice trailer wiring adapter. Very easy install. Takes about 30 minutes with all the tools needed. Drill, 7/64 bit for pilot holes to mount the bracket, flat blade screwdriver and 11/32 nut driver and two #10 self tapping metal screws with locking split washers and a couple zip ties to tidy up the wiring harness.
by: DJ03/07/2024
I looked at so many options before deciding on the B&W hitch, but I have no regrets buying it. There is nothing that my car is suitable for towing that this thing can’t accommodate. I even use it on the front hitch of my mower to move trailers around the yard! Adjusts very easily and stows nicely (though on my Ford Edge it rides lower than I like when stowed).
by: Mike03/27/2024
This is a great adapter to retro fit connections on my 2011 Expedition. Simple to instal and great support from etrailer.com.
by: Peter 03/26/2024
Simple install and it has both the 7 way and the 4 flat plugs.
by: John12/11/2020
Installed on our 2019 Edge ST with no significant issues. Works as expected, has reasonable required depth behind connector for ease of install, and the bracket was quite adaptable after some bending and cutting. Not impressed with the overall feel, though - plastic seems lightweight and cover hinge pin is already rusting after two winter weeks in western PA. Long term durability tbd.
by: Dennis 03/24/2024
It was great. The instructions were not for my specific year of transit but gave me enough idea to get it done
by: Farley05/08/2024
This Brake Controller works great ! With a little pre planning and watching some videos I was able to install this on my ‘99 Ford Expedition. No knee banging or awkward reaching to set the controller the dial is right on the dash panel. Training and dialing the unit in was a breeze and it gives me consistent braking as needed.
by: September11babe02/27/2024
Exactly what I ordered. Easy installation. Great product.
by: D01/16/2024
Easy installation, does exactly what it is intended to do.
by: Tom03/27/2013
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.
by: Cameron D.04/30/2019
This was exactly what I was looking for to add to my 2017 Ford Expedition! It is an easy to install plug-n-play product to convert a factory 4-pin connector to a 4/7-pin connector.
I plugged the 4-pin in, connected the brake wire, and grounded it. Ignoring the auxiliary + power cables, everything worked on the first test. The 4-pin connection was given some dielectric and wrapped with electrical tape to keep it sealed from the elements, and the slack was zip tied to secure it.
I still need to give it some finishing touches (fill the bracket gap with some black silicone, maybe find the reverse and/or power lines), but it lets me haul my camper!
by: Peter Foronda07/09/2018
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.
by: Rick Holbrook08/31/2020
I bought this so I can convert my dad's trailer to pull I only had a four and I needed a seven so I went and used a four to make it a seven. It's a very nice product it's got nice rubber grommets to keep everything protected.
by: Jack W09/07/2023
This company is amazing as they offer an incredible vast inventory of most anything one can imagine relating to trailers. They sent a nice email confirming the order and notice of being shipped, which arrived in just three days.
by: Hal04/15/2018
I recently installed the 4-pole to 7-pole adapter on my 2015 Highlander. My first install worked OK, but I ran into a ground clearance issue using the original mounting location. Etrailer suggested using a 2 1/2" mounting box to relocated the connector. Part number 18156 worked perfectly.
by: Nick 07/20/2023
Worked great in tandem with a new wiring harness. Still working after a year of use.
by: Mackenzie10/18/2019
The trailer wiring adapter was perfect and shipped in no time. Looks great on my ford ranger. Im very happy.
Was 4 flat only and now I can light my 7 way 18' trailer and have the capacity to add a brake controller (which I will add)
by: Adam04/28/2018
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.
by: William N04/25/2018
Wow after Charles great advice this was so simple to install, [online] 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!
by: John01/21/2013
Just what I need to tow an RV trailer. Also has a four flat connector. Very easy to install on the 18136 bracket.
by: C Moua02/28/2024
Does what it’s designed to. Works great
by: Dale07/25/2023
Just like always from etrailer, the right product, right on time, and right on the money.
by: Pete K.07/12/2020
They shipped my harness immediately to UPS. After two weeks I did not receive it, so I called the guy said it would be there Friday or Saturday, Saturday was the fourth so I knew that was gonna happen. So I waited till Thursday and called and talked to Amy E., She was great, she Found out that my harness was sent back to them. Amy re-ordered my harness, I received it on Saturday! The harness fit perfectly! So I am going to give them an excellent review! My patients was worth wait ,because it was exactly what I needed! Thank you so much Amy I appreciate all the help.
by: Royal D.11/08/2013
I use these adapters to install 7-way connectors on trucks that have no factory trailer wiring provisions.
by: Randall06/14/2020
2012 Chevrolet Express..Looks and works great! Easy install..2 1/8" hole saw for center, 3/16" drill bit for mounting screws. Thank you etrailer!
25
622
Show More Reviews
See what our Experts say about this Hopkins Trailer Wiring
- Troubleshooting 2014 Ford F-150 7-Way with No 12V Trailer PowerIf your F-150's 7-way socket no longer delivers +12V power there are a couple of potential causes. One is the relay, of course, which can be checked and replaced if necessary. In the 2014 F-150 the relay number 9 activates the trailer tow battery charge circuit. Another possibility is simply that there could be corrosion on the contacts or trapped foreign material inside the socket. Any electrical item exposed to the elements, such as 7-way wiring that can be hit with water and road salt,...
view full answer... - 2022 Nissan Pathfinder Hitch and Trailer Wiring for 7-WayThe Draw Tite hitch part # DT67GR is a confirmed fit for your 2022 Nissan Pathfinder and then for trailer wiring you'd want the Tekonsha part # TK58VR for a 4-way and then to convert to a 7-way you'd want the part # 37185 if the trailer does not have brakes or the part # ETBC7 if it does. Then you'd also need a brake controller like the Brake EVN # TK63VR and you'd be set.
view full answer... - Recommended 7-way Connector To Tow Trailer Without Brakes With 2020 Ford EscapeSince your trailer does not have trailer brakes you will just need the Adapter 4-Pole to 7-Pole and 4-Pole # 37185 which will plug into the 4-way connector already installed on your 2020 Ford Escape, and will give you a 7-way and 4-way connector for towing your trailer. If your trailer hitch receiver does not have the mounting tab for the connector to bolt to, you will also need the no drill mounting bracket # 18140. I included videos for both of the products mentioned for you to take...
view full answer... - Finding 12V Power Wire at Frame Rail on 2011 Ford Expedition with Factory 4-WayFor your 2011 Ford Expedition with 4-way flat, the wiring harness # 3035-P is a fit to allow you to install your Prodigy P2 brake controller # 90885. The blue brake output wire you found is the correct fit and you should also have the 12V power wire along the rear frame rail. There should be an orange wire for the 12V power to connect to your black power wire on your connector. If this wire is not present, then I recommend testing the wires in that location for 12V power using a circuit...
view full answer...
- 7 and 4-Way Recommendation for 2004 Jeep Grand Cherokee without Trailer WiringYou will need to start with a 4-way (if you do not have one). For that you would want the # C55369. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. This will give you both a 4 and 7-way too like you are wanting. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller.
view full answer... - Wiring 2001 Ford Ranger to Tow a Trailer with a 7-Way Blade, 7-Way Round, or 9-Way Round Connector9-Way trailer connectors are pretty rare, limited to big rig trailers and large RVs. A quick double check will confirm if the trailer has a 7-Way blade like # 37185, 7-Way round like # 47595, or a 9-Way round like # PK12906. For a 7-Way blade style, you will need to install a 7 and 4 Way Installation Kit, # ETBC7. Your existing 4-Way plugs into the back of the ETBC7 and then you will need to hardwire the remaining wires. White is grounded to the vehicle frame, yellow is for reverse lights,...
view full answer... - Recommended 7-way Connector For 2020 Ford Edge To Use Curt Echo Trailer Brake Controller C51180I would be happy to help! Since your 2020 Ford Edge already has a 4-way connector installed you will just need the # ETBC7L which was created specifically for the Curt Echo Wireless # C51180 you were wanting. This kit will plug in to your existing 4-way connector and just require you to run the black wire to the positive terminal of your battery with the included 40 amp circuit breaker, and ground the white wire to the frame of your vehicle. The # C51180 does not require the brake output...
view full answer... - Best Way to go From 4-Way to 7-Way for 2017 Mercedes Sprinter 2500If the travel trailer with a 7-way does not have brakes the easy solution is the # 37185 which would plug right into your current 4-way and all of the lighting circuits would be active. If instead you did have trailer brakes you'd want to use the # ETBC7 which comes with brake controller wiring needed as well as the same adapter of the # 37185. The 7-way kit part # TK22115 which is custom fit for you vehicle essentially is the same setup as a 4-way like you have converted to a 7-way with...
view full answer... - Parts Needed to Install 7-Way on 2018 Ford F-150Your 2018 Ford F-150 should at the very least have a 4-way trailer connector that you can plug into the # 37185 and have a functional 7-way. If you need to activate either the brake controller or 12 volt accessory wire circuit of the 7-way the wiring is present at a wiring harness near the rear of the truck on the frame rail as well like what you can see in the attached picture. For a hitch the etrailer # e98871 would be a really great option.
view full answer...
- Parts Needed To Install Trailer Wiring 2022 Hyundai Santa FeWhat you'll need is the 4-way kit part # CU94FR and then to convert it to a 7-way all you'd need is the part # 37185 which will bolt right up to the 7-way bracket your vehicle has currently.
view full answer...
- Parts Needed To Add 7-way Connector On 2009 Toyota Highlander W/ Tow PackageYou are correct that you will need to have a 4-way connector installed before you can install a 7-way connector on your 2009 Toyota Highlander. Since your Highlander has the tow package I recommend the Hopkins Plug-In Simple Wiring Harness for Factory Tow Package # HM11141825 which will plug into the factory connector found in your rear cargo area. To install a 7-way connector I recommend the Universal 7-way Connecter Install Kit # ETBC7 over the Hopkins Adapter 4-Pole to 7-Pole and...
view full answer... - Wiring 2005 Jeep TJ To Have 7 Way ConnectionIt looks like you've got the # PK11933 that connects your Jeep to the Pollack # HM40975 , which will only work if your Jeep TJ came with the factory 7 way connector. If your Jeep TJ has the factory towing package with a 4 way connector you'll be able to use the Hopkins # 37185 to connect to the existing 4 way and add a 7 way connection on your Jeep TJ. Using the adapter # 37185 does not by itself provide additional circuit connections for brakes, 12V power and reverse lights, but it DOES...
view full answer...
- Wiring to Install Hopkins 7-Way Adapter on 2009 Ford F-150It looks like you currently have the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185. Since you do not have any wiring on your truck for the brake controller, you will need the Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers # 5506. This includes a 25 ft. 10-2 Duplex wire as well as the circuit breakers and ring terminals you will need to complete the installation. I am attaching an installation video for our # ETBC7 universal installation kit on a 2013 F-150....
view full answer... - 7-Way Trailer Wiring Harness Recommendation for 2010 Mitsubishi Outlander GT V6Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how...
view full answer... - Can The C56261 and 37185 Share The Same 12V Wire On A 2015 Toyota Sienna?No, the # C56261 and # 37185 cannot share the same 12v wire on your 2015 Toyota Sienna. Both wires will need to be run to the battery as they are for different functions. 12v wire on the # C56261 is to power the converter. The black 12v wire on the # 37185 is to bring power to the 7 way plug. So they are both 12v black wires but they are not used for the same thing. There are no wires that will be combined minus plugging the 4 way into the 7 way. I do recommend using the # ETBC7 kit as...
view full answer... - Hitch Recommendation For A 2001 International School BusWhen it comes to installing a tow hitch on your 2001 International school bus the only type of hitch I recommend that is a bolt up hitch is The Adjustable Width Trailer Hitch Receiver for RVs # 13703. It is a universal style hitch that will fit frames between 22 inches to 72 inches. We do also have the weld on style hitch # C99CR which is a universal hitch for use on service body trucks and utility body trucks. When it comes to wiring your school bus we do not have a custom fit kit that...
view full answer... - Trailer Wiring Recommendation for a 2012 Suzuki Grand VitaraIt sounds like you are looking for a 7-way trailer connector for your 2012 Suzuki Grand Vitara. You will first want to start with a 4-way if you don't have one. For that you would want the Curt Wiring Harness # 56002 you were referring to. Now to convert it to a 7-way you will want the # 37185 if you don't have trailer brakes. Or part # ETBC7 plus a brake controller if you do have trailer brakes. This product comes with everything needed to convert the 4-way to a 7-way and install a brake...
view full answer... - Adding a 4- and 7-Way Trailer Connector on a 2004 Ford F-350In order to install a 4- and 7-Way on your 2004 Ford F-350 you will first need to install # C55265. This will plug right into the port in the picture you sent. It does look like there are some loose wires there that you will need to hardwire to a 7-Way. For a 4/7-Way I recommend # 37185. the 4-Way will plug into it and then you will need to hardwire the remaining wires. White is ground and should attach to the truck frame. Blue is output to electric brakes. Black is 12 volt power. Purple...
view full answer...
- Parts Needed to Install a 7-Way Trailer Connector on a 2003 Kia SedonaAfter you have installed a 4-Way flat trailer wiring harness on your 2003 Kia Sedona, such as # C55309 you have some options on adding a 7-Way. If you need only the lights on the trailer to work then you would just need # 37185. The 4-Way plugs into it and you would ground the white wire to the vehicle frame. the other wires can be taped up and stowed out of the way. But if the trailer has electric brakes or needs the 12 volt accessory circuit to be functions I recommend # ETBC7 which...
view full answer... - Adapter to Convert 4-Pole Trailer Connector on a Jeep Wrangler Unlimited to a 7-Way There are two types of 7-pin trailer connectors, the 7-way blade style which is much more common or the 7-way round pin which isn't very common at all, so I'll assume you have the 7-way blade style. I'll link you to our Trailer Wiring FAQ which has photos showing what both of them look like. There are two possible installation alternatives. If the trailer has brakes and you want them to function, you'll need to install a brake controller like the Tekonsha Prodigy P2, part # 90885. You'd...
view full answer...
- Installation and Wiring of P2 Brake Controller On a Fleetwood Freighliner MotorHome with Air BrakesThe best procedure for installing the Tekonsha Prodigy P2 Brake Controller, part # 90885, on your Fleetwood Motorhome with a Freightliner chassis and air brakes is to follow the Brake Controller manufacturers instructions. I contacted our representative at Freightliner, he informed me that if the motor home is a 2004 or newer there is a 6 pin connector under the dash that will be labeled either "TRBRK" or "TBC." This connector can be removed and the wires can be hard wired to the brake...
view full answer... - 7-Way Molded Trailer Wiring For Trailer End To Match Up With 7 Blade Adapter On Vehicle Some harnesses are different and will not match up correctly with the adapter on your vehicle. I would recommend cutting off the head of the 7 way plug on your trailer and installing The 7-Way Molded Trailer Wire Connector # H20042. This harness is a trailer end connector with a 3 foot lead. I attached a wiring diagram below of which wire goes where and the function of each wiring. I attached an installation video link below.
view full answer...
- Where To Wire Purple Wire From Hopkins Adapter 4-Pole to 7-Pole and 4-PoleI believe you are referring to the Adapter 4-Pole to 7-Pole and 4-Pole part # 37185 which has the manufacturer part number of 47185B. The purple auxiliary wire can be used for 12V power, reverse lights or reverse lockout for trailer brakes. The purple wire is normally connected to the reverse light signal of the Ford F-150 vehicle if your trailer has reverse lights or hydraulic brakes with an actuator that has an electric reverse lockout. You would need to use a circuit tester like part...
view full answer...
- Trailer Wiring Recommendation for a 2009 Audi Q7If there is a round connector at the rear of your vehicle that looks like part # 37185 then you have the factory trailer wiring. Most likely you would know if you had it and the correct trailer wiring you would need would be the part # C59236 that you referenced. If you wanted to convert the 4-way to a 7-way you would only need the # 37185 that I mentioned earlier.
view full answer...
Do you have a question about this Trailer Wiring?
Info for this part was:
Test Fit:
Joe V
Test Fit:
Nicholas E
Test Fit:
Shane T
Test Fit:
Randy B
Test Fit:
Joe B
Test Fit:
Jared G
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
Conner L
Test Fit:
David F
Test Fit:
Bradley B
Expert Research:
Jackie C
Expert Research:
Mike L
Expert Research:
Sarah L
Expert Research:
Robert G
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Brandon M
Expert Research:
Adam R
Expert Research:
Lori W
Expert Research:
Jeffrey L
Video Edited:
Zack K
Video Edited:
Andrew K
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Andrew L
Video Edited:
Dustin K
Video Edited:
Sue W
Video Edited:
Chris R
Video Edited:
Zach D
Updated by:
Adele M
Updated by:
Wilson B
Updated by:
Alexander C
Updated by:
Hannah L
Video by:
Kathleen M
Video by:
Alan C
Video by:
Jonathan Y
Video by:
Thomas T
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.