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  1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 Round - Blade
  6. 4 Flat
7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End

7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End

Item # HM40975
Our Price: $39.23
You Save: 30%
Custom Fit Vehicle Wiring

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Shipping Weight: 0.88 lbs
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This 7- and 4-pole trailer connector eliminates the need for an adapter and allows you to tow a trailer with either a 7- or 4-pole plug. Socket connects to your vehicle's OEM wiring system and mounts with included bracket. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM40975 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (2292)
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Hopkins Custom Fit Vehicle Wiring - HM40975

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • 4 Flat
  • No Converter
  • Hopkins

This 7- and 4-pole trailer connector eliminates the need for an adapter and allows you to tow a trailer with either a 7- or 4-pole plug. Socket connects to your vehicle's OEM wiring system and mounts with included bracket.


  • 7- and 4-Pole trailer connector with mounting bracket
  • Has high-impact, ABS plastic construction
    • Stainless steel spring for easy cover operation
    • Rubber gasket provides weather-resistant design
  • Includes mounting bracket for easy, snap-in socket installation
    • Black, epoxy-coated steel construction
    • Mounts to bumper with included screws


  • Application:
    • Replaces factory 7-way connector on Chevrolet, Ford, GMC and Nissan trucks and SUVs
    • Can be used to add a connector to 2003 and newer GM pickups and SUVs
  • Bracket dimensions: 4-3/4" long x 3-1/16" tall x 1-3/4" deep
  • Distance between mounting holes (center to center): 2-3/8"
  • 1-Year limited warranty

Dimensions of bracket

Note: Only one connector - a 4-way or a 7-way - can be used at a time because the covers on this socket will not open far enough to allow use of both plugs at the same time.

Similar to 11775, PK11893

40975 Hopkins 7- and 4-Way Trailer Connector Socket with Mounting Bracket - Vehicle End

Installation Details HM40975 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End - HM40975

Average Customer Rating:  4.8 out of 5 stars   (2292 Customer Reviews)

This 7- and 4-pole trailer connector eliminates the need for an adapter and allows you to tow a trailer with either a 7- or 4-pole plug. Socket connects to your vehicle's OEM wiring system and mounts with included bracket.


Worked exactly how described, great replacement for my risty only bracket and 7 pin connector. Fits my 2006 Chevy Silverado 2500HD perfect, plug and play. Bought specifically because the bracket is included. And with both 4 and 7 pin connectors, I don't have to use an adapter anymore!


I am not sure how this bracket passed quality control. It sure is a good thing I'm not planning on using it. Really disappointing to see how quality is overlooked during the packaging process. This should have never left in this condition.

Etrailer Expert

Jenny N.


Oh! It is definitely not how we want the bracket to arrive to you. I will have our Customer Service team reach out.


This thing couldn't be better. Easy mounting. Plug and play. I can now connect any trailer I want. Love it, love it, love it!



This was a major upgrade for me at the time. A year later, Ive hauled massive loads across the country, and this connector harness works perfectly every time


The box arrived opened and damaged. My wiring harness was missing. When I called to tell them my wiring harness was missing they told me that it was shipping separately but could not tell me when it would arrive. I later got an email telling me all of my items were delivered and asked me to leave a review. I still don't have my wiring harness and will not have the hitch installed by this weekend like needed because I don't know if I am ever getting my wiring harness.not to mention the box had no padding around the hitch so it's all scratched up.

Etrailer Expert

Katrina D.


I am sorry to hear that your order arrived in this condition. I see that our customer service department is currently working on a solution for you.


7 and 4-Pole Trailer Connector Socket does not fit my towing vehicle.

Today I just received my etrailer order #114979486, that consisted of: Curt T-Connector Vehicle Wiring Harness with 7-Way Trailer Connector (ITEM # C56431) and 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End (ITEM # HM40975) for my 2020 Ford Ranger. I easily installed the harness, but the Trailer Connector Socket does not seem to fit on the rear bumper, next to the license plate.

Last week, I chatted with etrailer customer support rep and I was assured that the connector Socket (ITEM # HM40975) would fit on my 2020 Ford Ranger.

This etrailer customer support representative referenced a previous Q&A Topic titled, "Can the HM40975 be used on a 2021 Ford Ranger". I was also assured that 2020 and 2021 Rangers have identically constructed rear bumpers.

Today, I spoke with a different etrailer customer support representative. This rep told me 7-Way Trailer Connector (ITEM # C56431) was not compatible with the 2020 Ford Ranger recommend reaching out to the manufacturer directly for more information.

I'm very frustrated!!!! Can I please get a solution to this issue ASAP.

Etrailer Expert

Jenny N.


I am sorry that this has been a frustrating experience, however I do have an answer for you. The Hopkins connector part # HM40975 is technically not a fit on its own for a 2020 Ford Ranger. The short reason why is that the Ford Rangers do not have the round US Carr type of connector to plug into. Now by adding the Curt harness part # C56431 like you did, does make that round connector that you can plug into the back of the Hopkins connector that will give you the 7 and 4 way you want. Since it is using two different manufacturer products together, I do encourage you to test the 4 and 7 way to make sure all the signals are working correctly. In theory they work together, however they are not tested. The issue is going to be that the bracket that comes with the Hopkins connector is not going to match with anything on the Ford Ranger to connect to. It would just be bolted to the bumper or you could also consider using part # C57202 to install it on your hitch.


This dual connector adds a professional looking touch to our tow wiring installation


Fit and works fine. My old one was just the 4 plug so now I don’t have to use the adapter for 7 prong anymore.



Works fine- no issues.


A very good option to cut down on rattle. This is a durable product that is fairly simple to install. My only complaint is the magnet to keep cover closed when not towing should be stronger. I am happy with the purchase and it looks like it will be useable for years.

2014 Chevrolet Silverado

Here's some snaps of my Hopkins #40975 installation. I can confirm that it's an identical replacement for the 2014 Silverado 1500 trailer-light blank insert, no bracket required. It took me 30 seconds to plug the Silverado's OEM 7-pin round connector (located inside the blank insert) into the #40975 Wiring Kit and snap it into the cutout. Then I tested the flat 4-pin outlet of the #40975 with a 5 dollar 4-pin LED tester from West Marine, and all light functions tested good. Shweet! To remove the OEM blank plug, it helps to reach behind it and pinch the two spring clips holding it in place... same with the #40975 if it needs to be removed for some reason. When I ordered the part from eTrailer, your site had a comment, "This will not fit your vehicle. See below for compatible parts," or words to that effect. Maybe take a look at that and remove the comment, as the #40975 is an exact fit for 2014 Silverado 1500, no bracket needed. Thanks, eTrailer team!

Ron P.


Although I havent towed since installing the Hopkins Pollak wiring kit since I installed it a year ago, I have tested the 4-pin connector for proper function using a 4-pin LED tester from West Marine and it checks out okay. Recently I inspected the kit for water intrusion mentioned by one of the raters, and I found no evidence of moisture inside the dual-connector compartment. On installation, I did make liberal use of the dielectric grease that accompanies the kit. Good product, easy installation, and great price.


This was a drop-in. Literally unplug the wiring harness off the blank, pop out the blank, pop in the new connector assembly then plug the wiring harness back into the connector. Honestly took less than 4-minutes. Awesome product. My local hitch install company wanted $150 just for the install of the connector.

2003 GMC Sierra

Top quality trailer connector that fir original wiring harness perfectly.
Installed in under 15 minutes.

John C.


Works great and looks great. Get compliments on the hitch.

2017 Nissan Pathfinder

It came with it's own bracket, which is a plus. It was compatible with's part number C56357, which is also a plus. The self tapping screws being the only hardware coming with the item was a disappointment. I just installed's part number 76301 hitch receiver which has a mounting plate for brackets like this. The self tapping screws, which might have been effective, wouldn't have looked "professional." After finding some hardware which worked, it went on smoothly and fits well with the rest of the assembly.

Matt W.


This product has been working well for the past year. I feel this was a smart purchase.

2005 Chevrolet Silverado

Super fast shipping easy installation looks better than factory plug love the 7way and 4 way so no more dealing with adapters

Toyota Highlander

I’ve had a great experience with the etrailer company. I fully equipped my 2022 Toyota Highlander which did not come with the factory tow package. I bought the receiver hitch, the wiring harness kit, a brake controller plus this special 7x4 pole connector, which did not come with the wiring harness, which only had.7 pole. I also bought a special bracket to mount the connector where it needed to go. Their service was great. Unfortunately they did not carry the Anderson weight distribution chain type hitch that I purchased from Anderson. They are a well run, customer focused Company that I highly recommend

2015 Audi Q7

Scratched my head for a while, trying to find a quality way to connect this vehicle end 4/7 wire socket to my trailer ready (almost) 2015 Audi Q7. Finally decided that it really didn’t need to be bolted, but could be hose clamped to the existing heavy duty Audi bracket.

Mounted it sideways with a 1” diameter and a 3” diameter hose clamp. Be sure to use a 3” clamp with lots of serrations that all it to tighten it down a lot.

You’ll need to drill out the small hole of the supplied bracket to allow a clamp to fit through it. The other hole is a slot, and works unaltered. Small clamp on bottom, large clamp on top.

You’ll also need to relieve a small spot on the trim piece to make room for the 4-wire door to o-en freely. This is marked as red on one of the pictures.

Looks good and should work good!



Good installation approach for q7’s. Keeps water from collecting in wiring junctions.


Perfect fit, and easy installation.

2000 Ford F-150

Nicely made, exactly what I want, just wish that the bracket was a little longer, the best place to mount it was on bumper and the plastic trim is on the way to open it but the product is better than expected

2014 Ford F-250 Super Duty

Fit perfect just would like a pigtail for the part that comes from truck

2018 Nissan Pathfinder

Exactly what I ordered, although I thought it was supposed to be vehicle specific and would connect to the factory wiring it’s not. I have to now order the adapter that goes between this and the Nissan wiring connection.

2013 Jeep Grand Cherokee

Bracket and plug fit as advertised. My vehicle had the factory harness, and it was truly a plug and play install. Good tutorial video on the website as well.


The product is great and installation instructions were right on the money. But even better was the customer service and the helpful assurance that this hitch receiver would fit our truck with an aftermarket roll pan! Delivery was quick and satisfaction was guaranteed!


nice looking product, haven't plugged into it yet to know of the electrical part, caution about the install, make sure you have about 5" clear directly behind the install location of your bracket to allow room for the connector and to attach your vehicle plug, see photo, I had wanted to mount this on the bottom of my bumper, but not enough clearance

Etrailer Expert

Victoria B.


A no-drill mounting bracket like # C57202 is a great way to give clearance needed to mount the wiring connector higher up on the hitch.


Great product at a great price. It was an exact fit and looks great. I like having the ability to plug in my 7-prong plug on my travel trailer or the 4-pin plug on my boat, without needing an adaptor. Got super fast shipping too. Buying from was a win- win-win.

Bob R.


What year is your silverado

Etrailer Expert

Rachael H.


Randy S.


Its a 2014 Silverado 1500 Double Cab

2001 Ram 2500

Plugged right in to the factory harness 2001 Chevy 2500 HD long bed


The trailer hitch plus 7-4 Pole trailer connector all fit perfect on my 2018 Grand Cherokee. Installed it myself with the help of a couple of jack stands to support the hitch while I bolted it in. Saved a bundle over having the dealership install the Jeep brand. The hitch is barely noticeable. The only issue with a jeep is they do not activate the connector plug so I had to have the dealer activate it after I installed it.

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