1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 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

lowest price pledge
Retail:$50.72
Our Price: $45.84
You Save: 10%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $99 qualify for Free Shipping
Shipping Weight: 0.81 lbs
Quantity: 
In Stock
HM40975 - 7 Blade,4 Flat Hopkins Custom Fit Vehicle Wiring
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

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.

Product Images

In Use/Installed

Customer Photos

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. Call 800-298-8924 to order Hopkins custom fit vehicle wiring part number HM40975 or order online at etrailer.com. Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (1357)
  • Q & A (887)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring

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

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.


Features:

  • 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


Specs:

  • 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

Item # HM40975

Installation Details HM40975 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (1357 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.

- HM40975
by:
2011 Jeep Grand Cherokee

This was a great addition to the hitch I bought for my 2011 Grand Cherokee. I was able to plug it right into the factory harness for a perfect fit. The only issue you may have is the trailer lights won't work until you get the computer flashed from the dealer to tell the Jeep it has a towing harness attached now. 54337


Comments
I have a 2012 Jeep Grand Cherokee that came without the tow package, but which still had the 7-way connector at the rear. This trailer connector socket attached easily to my hidden hitch, and connecting it to the Jeeps 7-way was a snap. If your trailer signals and brake lights do not work after installing this socket on the 2012 WK, youll probably have to take it to the dealer for a body control module re-flash, and itll cost you around $100.
-- comment by: Randy D - 02/19/2013

1065

Thanks for the info. We have seen some dealers so it for less even for no charge. Just depends on the dealer.

-- Patrick B - 3/21/2013


- HM40975
by:
2018 Jeep Grand Cherokee

Plug and play, couldn't be easier! Decent price too. Only 4 stars due to the ridiculous self-taping screws they expect you to put through 3/16" steel (just guessing on the thickness - it's 1/8-3/16 best guess...). The install video on the site shows them using nuts/bolts/lockwashers to install it, which is what I did. This product should come with that arrangement instead of the self-taping screws, in my not-so-humble-home-installer-opinion... 554683



- HM40975
by:
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! 567819


Comments
Good installation approach for q7’s. Keeps water from collecting in wiring junctions.
Rob - 09/22/2019

61405

- HM40975
by:

Good quality no issues 568536



- HM40975
by:
2017 Nissan Pathfinder

It came with it's own bracket, which is a plus. It was compatible with etrailer.com'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 etrailer.com'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. 538985


Comments
This product has been working well for the past year. I feel this was a smart purchase.
Matt W - 07/07/2019

57543

- HM40975
by:
2013 Chevrolet Traverse

very easy to install. it is a rather tight fit on a Chevy traverse. Allows a factory install of aftermarket hitch by using GM harness # 25910884 ($68.00) . Harness comes with snap in wire ties that go in holes on cross frame of rear bumper. Vehicle to connector harness is located to the rear of right rear tire between outer body panel and tail light . Use flash light and look up. Cord fits E trailer Vehicle end plug 40975. Need to drill two holes in cross frame for bracket. It all snaps together very well. Also need to add 3 relays in engine fuse box. GM13502753. This is gray relay 1/2 in square and has 2750 market on top. this eliminates splicing delicate factory wiried and hassel of hot wire from battery. Bumper skirt snaps back into place and hides hitch totally on 2013 Chevy Traverse. 87284


Comments
Has worked like OEM installed product only about $400 cheaper.EXCELLENT I will do it again on my next vehicle,
Chas - 07/03/2014

5294
Comments
Chas,Where did you mount this part on your Traverse? I want to mount it to my 2010 Acadia but I cant find a good place to mount it? Can you send me a picture?I already bought the gm factory harness to install along the cross frame.
-- comment by: Rod b - 05/10/2015

11570
Comments
I installed it to the left of the receiver. trimmed some of the plastic on bumper trim that holds the removable access cover for the hitch. Y ou need to be careful not to cut away the slots that hold cover in place. The installed hitch and electrical are completely concealed.. Note there are several blogs on the Traverse owners forum. I also bought the correct tow switch,and relays that fit in the engine compartment fuse box. The ranny is already programmed at factory for tow mode. One fellow posted photos of the whole prcedure and listed all part numbers. I also ordered the tranny cooler from E-Trailer. Be sure to use a digital thermometer to be sure you hook up to correct lines. You will need to find correct fitting on internet. It will take some time to remove most of the front clip to have room to work.Incidentally I drove Traverse up on a coulpe fo 4X4 to be able to work under it., I used a floor jack to raise up hitch to align it.chas
-- comment by: Chas - 05/19/2015

11875

- HM40975
by:

Good fit and worked just fine. A bonus is that it also has the 4-pin connector built-in so no adapter is required for that kind of trailer connector. 563271



- HM40975
by:
2010 Ford F-150

This is a plug-in replacement for my 2010 Ford F-150 with factory installed trailer package. I had this exact same connector but someone unclipped it and stole it. Ford Parts wanted over $100 for a replacemnt (they included the entire rear bumper harness that I did not need). I had the cutout on the hitch that exactly matched this bracket and the blue socket that you see in the optional pigtail available for this product (see attached photo). I snapped this dual connector into my existing cutout - fit perfectly. Did not need to use the included bracket. So if your factory connector is damaged or stolen, use this as a snap-in replacement. The only difference is it says "Pollack" instead of "Ford". I called Hopkins before I bought and they said they supplied a lot of the OE parts Ford uses. 55449



- HM40975
by:
2012 Chevrolet Traverse

I just received my package from Etrailer.com and it was nice to open the box and have the right part/part I ordered arrive. Opened up the box staged my parts and started the install. It was very easy with the instructions that were sent and the video on their site that anyone can do this install with no issues. Hitch was on in no less than 15 mins from opening of the box to final torquing of the bolts. The customer service at this company is top notch. I have never had anyone from a company email me before after ordering from them like I did with this company and in business today you are seeing less and less of this type of customer care and service. AWESOME job Guys and Gals I will buy all my accessories from here. 90754



- HM40975
by:
2018 Nissan Pathfinder

I ordered DrawTite hitch #76031 along with Tekonsha Wiring #118273 and HM40975, 7 and 4-Pole Trailer Connector Socket for my 2018 Nissan Pathfinder SL. I ordered on a Thursday afternoon and the merchandise arrived the following Monday evening (with free shipping and no tax). The hitch arrived in excellent condition with no scratches or scrapes and was packaged very well. The total for my order was a great price! This also included a tube of dielectric grease and a brush. To get a factory hitch would have required an expensive "Technology Package" at a cost of over $2000 or a dealer install which would have cost over $1000. I did the install of the hitch myself. It would have been far easier if I had a lift to raise the vehicle off the ground, and a helper to hold the hitch in place and get the 6 frame bolts started. I used an ice chest to prop up one side of the hitch while I got the bolts started on the other side. Watch the videos from etrailer before doing the install. I did have to trim about one-eighth of an inch off the corner of the gasoline vapor recovery box on the left underside of the vehicle to get the hitch into a position so that the holes in the hitch lined up with the weld nuts on the frame. I used a rotary file on the end of my drill to do this. The 2X2 receiver does barely touch the bottom of the rear trim on my Pathfinder but did not require cutting the trim to get it to fit. The Tekonsha #118273 Factory Wiring was not difficult to install. The etrailer video on how to install this item was not as good as it could have been. The installer says he is going to make the 2 vehicle connections inside the left-rear of the vehicle "by feel," which may be fine for someone who knows what he is doing, but was not helpful to me. I pulled back the trim on the inside left rear to make these 2 connections. You should definitely make ALL of your wiring connections BEFORE installing the hitch itself. If you don't, it will be very difficult to reach the connectors outside the right rear of the vehicle if the hitch is already in place. BE WARNED about this. The HM40975 connector was very easy to install and by having it you will not need to use an adapter to use a 4-way flat trailer connector. I used 2 stainless steel bolts to fasten the bracket into place instead of the included self-tapping bolts that were in the kit. This item is well worth the small cost. I am completely satisfied with my purchase from etrailer and will not hesitate to recommend them highly. Both George and Adam at Etrailer were very helpful. See the picture of the completed install on my 2018 Nissan Pathfinder SL. 566326



- HM40975
by:
2015 GMC Sierra-1500

This was what I needed to make my new truck able to pull my two trailers. You even had a video showing how to install it on your web site, this helps a lot. Thanks for the help. 211204


Comments
Thanks for the follow up Rachael, the part is working great, dont use it very often but still needed to have one. You guys are great! Will recommend your site to others needing parts. Glad that a Company can still value there customers now a-days, does not happen as often as it use to.
Dan R - 08/05/2016

19960

- HM40975
by:
2014 Chevrolet Silverado 1500

Was exactly what I looked at on-line. The description was spot on. Was shipped in a timely mannet and it installed in just a few minutes 225112


Comments
The product is working fine. I like having the product so I dont need adapters. Thanks
Marshall a - 09/11/2016

20896

- HM40975
by:
Ford F-250 Super Duty

Trailer plug unit (Pollack 7 & 4 pole for my F-250 was broken by the car wash. Called the dealer and they wanted double what e-trailer sales it for plus I had to special order and that took too long to ship as I needed it immediately. I went online and found ETrailer.com and they had the exact replacement device that was identical to what the manufacturer had installed. I ordered it and asked to have it within a set timeframe and e-trailer did exactly what they said they would do! The lady I spoke with Cathy was on the stick with the entire order and follow-up. The Etrailer staff then followed up the very next day of delivery. I have just installed the plug this morning so it has to be tested but do not forsee any issues as it is the exact replacement which worked great before. I am very impressed with the service here and will most definitely buy from them again as well as refer my freinds and business associates. I manage a commercial fleet as well as work with many other contractors who have trucks and trailers and there is always the need for something in this category. Great job ETrailer, you have a new long term customer. 42962



- HM40975
by:
2017 Jeep Grand Cherokee

Installed on 2017 Jeep Grand Cherokee Laredo and Draw-Tite hitch. Setup was super easy using factory connection. Now just have to have Jeep dealer activate the trailer towing feature to get it to work. Couple quotes for $140.00 to flash computer. Seriously I asked. Oh well. I'm knocking it down 1 star because if you look at the video that etrailer has for installing this product, they installed on a hitch that had the mounting bracket on it and didn't use the self taping bolts. It seemed at least to me, there were/would be nuts and bolts provided with the kit (along with the self taping bolts). At least for me that wasn't the case and I had to piece together the hardware. 505920



- HM40975
by:
2008 Ford F-250 and F-350 Super Duty

Quality OEM [email protected] substantially lower cost then OEM. 83070


Comments
It appears there is an engineering design defect in this product - at least when installed on my 08 F250. Water from Michigan weather - i.e. rain, snow and car washes continues to find its way into the plug, corroding the contacts and causing a wiring fault. No Im NOT backing into water to unload a boat, Ive removed, cleaned and dried the inside at least three times, covered the contacts and connection points with dielectric grease and carefully sealed the unit w electric tape. Last week, I sprayed the outside of the plug w/ flexible rubber seal yes as seen on TV in my fourth attempt at stopping the water from getting into the plug. This past week, while on a 500 mile road trip we made it through torrential driving rain without experiencing any connection issues. Im keeping my fingers crossed and hoping I dont have to take the plug apart, now that its sealed in the rubber coating!
David S - 06/03/2014

4610

We hope the rubber coating takes care of the problem. If not, we've got a couple of suggestions. You mentioned dielectric grease. If you weren't already, you can be pretty liberal with the application. You can fill the socket and push the connector in and wipe the excess that squirts out. If all the voids are full of grease, there's no place for the water to go. Second, on most of these types of connectors, there is a rubber gasket on the vehicle side that usually stays in, but will sometimes pull out when you remove the cap or the previous 7-way connector. If you still have the cap or old connectory, you may want to check for the gasket.

-- Patrick B - 6/9/2014


- HM40975
by:

Good product. Fast service 570072



- HM40975
by:
2006 Ford F-250 and F-350 Super Duty

Perfect!!! 235563


Comments
Absolutely love the product!! Is holding up amazingly!!!!*
Zachary G - 03/12/2017

22749

- HM40975
by:
2018 GMC Sierra

The 2018 GMC Sierra 1500 base model with no options has the wiring harness at the bumper. The bracket and bolts are not needed on the GMC 1500. 552385



- HM40975
by:
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! 120915


Comments
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.
Ron P - 03/19/2015

10141

- HM40975
by:
2020 Ram ProMaster 3500

Clipped right into the Tekonsha 7-way harness I ordered--used this instead so I don't need an adapter for 4-pin trailers. Came pre-greased, I'm down! 855416



- HM40975
by:

Only had it installed a couple of days ago, so I can not say how durable or resistant to rain it may be. Materials look strong enough, so I would recommend it if you need one 855096



- HM40975
by:
2001 GMC Yukon XL

Great service! my order was delivered as promised with etrailer communicating with me each step of the way. Videos were extremely helpful during installation. Highly Recommend etrailer. 855239



- HM40975
by:

really easy to install 851006



- HM40975
by:

Perfect fit minutes to install . Thank You 850791



- HM40975
by:

Very easy installation. quality feeling to the part. very happy to have made the purchase 848667


39
1389
Show More Reviews

Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • Recommended Trailer Wiring Harness for 2015 VW Touareg
    The Hopkins 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 referenced in your question is intended as a factory replacement. If your VW Touareg came with a factory 7-Way connector and you need to replace it, this item will work perfectly. Otherwise, if your vehicle does not have an existing factory connector at the rear bumper, I instead recommend the T-One Vehicle Wiring Harness # 118668. This custom-fit harness will install by connecting directly to the built-in...
    view full answer...
  • Trailer Wiring for 2018 Mid-Year Jeep Grand Cherokee Without Tow Package
    For a 2018 Jeep Grand Cherokee without the factory tow package we offer a 4-pole trailer wiring harness from Tekonsha, part # 118727, that installs at your tail light connectors. This provides a completely independent wiring setup that does not require any factory tow package components. The harness installs by plugging in at your two tail light assemblies along with connection of one single power wire that delivers 12V operating power from the vehicle battery. Installation is shown...
    view full answer...
  • Parts Needed to Install a 7-Way on a 2017 Ford Transit T250
    Your 2017 Ford Transit T250 will have a round connector at the rear of it that the part # HM40975 would connect directly to since your vehicle has the tow package. If it didn't have the tow package you'd need to start with a 4-way like part # 118643. 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. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller....
    view full answer...
  • 7-Way and 4-Way Trailer Wiring Harness for 2017 Chevy 3500 Express Passenger Van
    Yes, we do have a 7-way/4-way connector that fits the round connector on your 2017 Chevy Express Van. For that you'd want the part # HM40975. This has a 7-way on one side and a 4-way on the other. I attached an install video for this on a similar 2014 Express Van as well.
    view full answer...
  • Trailer Wiring for 2020 Chevy Traverse with 7 and 4 Pole Connectors
    I do have a way for you to have a 7-way and 4-Pole connector on your 2020 Chevrolet Traverse, but there isn't a wiring harness for your car that comes with both plugs. You can use the T-One Vehicle Wiring Harness # 118287, which is confirmed to fit your Traverse, and plugs directly into your factory harness. You can then use the Hopkins # HM40975 in place of the 7-way socket that comes with the harness. The # HM40975 also comes with a mounting bracket to easily attach it.
    view full answer...
  • 4-Pole/7-Way Trailer Wiring Setup for 2018 Nissan Titan Without Factory 7-Way
    Hopkins 7-way/4-Pole Vehicle Connector kit # HM40975 consists of the 4-and-7-way connector, a mounting bracket and hardware. No relays are included since this kit is intended for use on vehicles equipped with a factory 7-way tow package. The similar kit # N40975 includes relays. On a Titan without any factory wiring you can add trailer harness (that is completely independent of any included or missing factory components) by installing 4-pole powered harness kit # 119147KIT which plugs...
    view full answer...
  • Truck Bed 7-Way Wiring Recommendation for 2018 Chevy Silverado 1500 for Slide In Camper
    For a 7-way to install in the bed of your truck to make connecting your camper lights easier you would want the part # 41157. Most 7-ways will be at the rear of the truck near the bumper which doesn't work well with campers. This kit installs in line with the 7-way at the rear of your truck and gives you a second one to install in the bed. This is a confirmed fit for your 2018 Chevy Silverado 1500 too.
    view full answer...
  • Trailer Wiring Needed for a 2017 Ford Transit T250
    If your 2017 Ford Transit T250 came with the factory tow package then you simply need the Hopkins # HM40975 to add both a 7-Way and a 4-Way connector. This will plug into the US Car Connector at the rear of your Transit. We also have kits that can be used if your Transit doesn't have the factory tow package. For basic trailer lighting functions use the Tekonsha T-One # 118643 which plugs into connectors behind the tail lights on your Transit and are powered through the 12V lead that...
    view full answer...
  • How to Upgrade from Factory 4-Way on 2018 Ford F-150 To 7-Way Without Using an After-market Bracket
    It is possible to do what you are trying to do but not with the Hopkins plug part # HM40975 because it is designed as a replacement part for a 7-way on your truck. It does not come with the harness that you need to activate towing functions with the square connectors. You can cut the hole with a dremel tool and use a Ford adapter 9U5Z 14489 MAA Plug and harness FL3Z 13A576 B Harness but you will still need to cut out that hole. I recommend to use the Curt T-Connector Vehicle Wiring Harness...
    view full answer...
  • Recommended Trailer Hitch for Carrying Bikes on 2013 Audi Q7
    To add a trailer hitch to your 2013 Audi Q7 I recommend the Draw-Tite Class III Max Frame Receiver Hitch # 75950. This hitch is confirmed to fit your vehicle and it will use existing holes in its frame for a no-drill installation. The installation process is a bit extensive and will indeed require you to remove the bumper fascia and do some trimming before installing it back on the vehicle after the hitch is in place. I have attached the complete installation instructions that you can...
    view full answer...
  • Recommended Trailer Wiring Harness for 2016 Chevrolet Express Van 3500 with Tow Package
    Since your 2016 Chevy Express Van features the factory tow package, I recommend the Hopkins 7- and 4-Pole Trailer Connector Socket # HM40975. This custom-fit connector will install by plugging right into the OEM wiring system beneath the vehicle. It will provide you with both a 7-Way and 4-Way connector, so you have some versatility in case you ever tow a trailer with a 4-Way. This will be a simple, plug-and-play installation and the end result will give you a nice, from the factory appearance....
    view full answer...
  • 2018 Ford Explorer XLT 4 and 7-Way Recommendation
    For your 2018 Ford Explorer the Hopkins 7 and 4-Way kit you'd need is the part # 118272. This will plug right into the square connector you have at the rear of the vehicle and will give you a 7-way you need. To convert it to a 4 and 7-way then you'd need the part # HM40975. I attached an install video for this connector on a 2018 Ford Explorer just like yours for you to check out as well. You will need to install a brake controller too to activate the trailer brakes. For a brake controller...
    view full answer...
  • Factory 7-Way Wiring Color Code and Replacement Harness for 2018 Ford F-150
    I took a look at the online version of the owner's manual for your 2018 Ford F-150 and was able to locate the wiring color code for the factory 7-Way trailer harness on the truck. The wires leading up to the factory plug are as follows: Yellow - Left turn/stop lamp Green - Right turn/stop lamp Brown - Running lights Blue - Electric Brakes Orange - 12V battery power Grey - Reverse lights White - Ground If you find that the harness is fine and you just need a replacement 7-Way/4-Way...
    view full answer...
  • How To Help Keep the Curt Echo Mobile Trailer Brake Controller Secure While Towing
    The majority of the complaints with the Curt Echo Mobile Trailer Brake Controller part # C51180 not being secure have a lot to do with the factory trailer connector they are being used with. These factory trailer connectors do not hold the same levels of tolerance as some of the aftermarket trailer connectors. The Curt Echo could fit perfectly inside the trailer connector on one 2015 Chevrolet Colorado without any play and then poorly on another 2015 Chevrolet Colorado. The solution to...
    view full answer...
  • Replacement 7-Way and 4-Way Connector Bracket for 2008 Ford F-250
    To replace just the mounting bracket for the factory 7-Way/4-Way connector on your 2008 Ford F-250 the Pollak # HM40978 will work perfectly. This isn't an exact OEM replacement but it will fit with the existing connector and mount beneath the bumper just like the one you have. If you do happen to also need the connector itself the Hopkins 7- and 4-Pole Trailer Connector Socket # HM40975 that you were looking at will indeed plug right into the factory US Car connector port under the...
    view full answer...
  • Parts Needed To Add An Electric Brake Controller On a 2019 Ford Transit T350 with Tow Package
    To add an electric brake controller to the 2019 Ford Transit T350 with factory tow package, first you need a 7-way plug at the rear of the Transit. If you do not have a 7-Way plug you can use Hopkins plug part # HM40975 that connects to your vehicle's OEM wiring. For a brake controller, I recommend Curt Echo Brake Controller part # C51180 which plugs in line with the 7-way connector and has a built in inertia sensor. The built in inertia sensor senses with the Transit is braking and...
    view full answer...
  • Is Wiring Harness for 2016 Nissan Frontier Compatible With 7- and 4-Pole Trailer Connector
    Yes, you can use the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 with the Replacement Wiring Harness for Factory Wiring Harness - 7-Way Connector # 118282 that fits your 2016 Nissan Frontier; the two are compatible because the 7-way from the wiring harness uses the same type of connection as the 7- and 4-pole socket.
    view full answer...
  • 7-Way Plug Recommendation for a 2003 Chevy Silverado 1500
    The 7-way part # HM40975 that you referenced should plug right into the trailer wiring socket you have at the rear of your 2003 Chevy Silverado. There should be a round plug tucked under the rear bumper of your truck that would plug right into this. I attached an install video for this connector on a 2003 Chevy Silverado just like yours.
    view full answer...
  • Recommended Trailer Connector For 2014 Jeep Grand Cherokee Laredo
    We do have a solution for your 2014 Jeep Grand Cherokee Laredo. All 2014 Cherokees have the wiring harness furnished from the factory and all that is needed is the trailer connector socket. I recommend the Pollak 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket, part # HM40975. This will plug into the wiring at the rear of your Cherokee and give you a 7-way connector and also a 4-way connector. This adapter comes with a mounting bracket as well. After installing this socket...
    view full answer...
  • Easy Way to Add 4-Way Trailer Connector to Rear of 2014 Volkswagen Touraeg with Round Connector
    Thanks for the picture of the trailer wiring connector you have on your 2014 Volkswagen Touraeg, based on that your vehicle is wired for a 7-way and just missing the socket. So the easiest solution to give you a 4-way is the part # HM40975 that you referenced. This has a 4-way on one side and a 7-way on the other plus comes with a bracket to mount easily to your rear bumper as well.
    view full answer...
  • 7 and 4-Way Recommendation for 2018 Ford Explorer without Tow Package
    Your best option for installing both a 7-way and a 4-way on your 2018 Ford Explorer without the tow package is the T-One 7-way kit part # 118272 that you referenced and then swapping the 7-way out for the # HM40975 so that you have both connector styles. Once you do that you'd be set!
    view full answer...
  • Adding a 7-Way Trailer Connector and Brake Controller to a 2016 Chevy Express LT
    If your 2016 Chevy Express van did not come with a factory trailer connector at the back then we have to assume that it does not have the factory tow package. It could have some of the wiring for it but just not active. In order to install a 7-Way trailer connector you would first need a 4-Way using # 118392. Then, after that is installed, you will need # ETBC7 to install the 7-Way and retain the 4-Way. If you pull the cap off that plug in your picture and it turns out to be a functional...
    view full answer...
  • 7-Way/4-Pole Combination Wiring for 2018 Nissan Pathfinder
    All trailer wiring parts for the 2018 Nissan Pathfinder appear on the linked page. These include the item # HM40975 which is a Replacement combination 7-way/4-pole connector intended as a factory replacement. If you have no trailer wiring you can instead use kit # 118273 which includes relays, wiring and the trailer connector along with the part # HM40975 which will replace the 7-way included in the kit t give you both types of connections.
    view full answer...
  • Availability of 7-Way and 4-Way with Harness to Run to 2002 GMC Sierra Trailer Wiring
    If you have loose trailer wiring wires on your 2002 GMC Sierra what you need to install the 7-way and 4-way you mentioned is actually the part # HM40975-11998 which comes with the connector plus a harness with 7-way wiring that you could run to your truck's wiring.
    view full answer...
  • Replacement 7-Way Trailer Connector for a 2002 Chevrolet Tahoe
    The correct replacement trailer connector for your 2002 Chevrolet Tahoe is actually the Hopkins Endurance Twist Mount 7-Way RV Trailer Connector part # HM40930 as it will use the same mounting bracket that you have attached in your photo. This is known as a twist style and is specific to GM's. The Replacement Custom Multi-Tow 7-Way and 4-Way Trailer Connectors part # 30955 will not work with this mount. The Hopkins Endurance Twist Mount 7-Way RV Trailer Connector will be plug and play once...
    view full answer...
  • How to Use a 4-Way and a 7-Way at the Same Time When the # HM40975 is Installed
    If you already have the # HM40975 installed on your vehicle you could install the part # 118384 as well and then you would have a second 4-way that would be accessible while the 7-way is being used. This 4-way will install inline with the 7-way harness and can be used at the same time as the 7-way.
    view full answer...
  • Attaching 7-Way Bracket to Rear of 2015 Jeep Grand Cherokee
    When we installed the 7- and 4-Pole Trailer Connector Socket # HM40975 on a similar 2015 Jeep Grand Cherokee we attached the bracket to the lower rear fascia like what you see in the attached picture. This would be the best way for you to mount it as well! This is by far the easiest to instal, gives the cleanest look, and also gives both a 4- and 7-way connector too!.
    view full answer...
  • How to Disengage Brakes on a Boat Trailer While in Reverse
    If the brake actuator on your boat trailer has an electric reverse lockout solenoid like part # T4748800 and you were using the 7-way side of the 7- and 4-Pole Trailer Connector Socket part # HM40975 then yes, the brakes would release while in reverse. However, in order to use this harness on your vehicle you will need to have a U.S. car connector plug like part # C56229 already installed. If not then you can use something like part # C57187 to release the brakes on the trailer while in...
    view full answer...
  • Installing 7-Way Trailer Connector on 2009 Jeep Liberty
    You're on the right track. You'd first need to install a T-1 connector like part # 118554, which will provide a 4-pole connector for the trailer lighting functions. To convert to a 7-way connector, you'd use the # 37185 adapter, which will plug into the 4-pole provided by the 118554 and provide you with both a 4-pole and a 7-way trailer connector. This is the way you'll want to go if your trailer is NOT equipped with electric brakes. However, if your trailer has electric brakes, and...
    view full answer...
  • Parts Needed to Add 7-Way and 4-Way to 1995 Ford F-150 without Trailer Wiring
    We have exactly what you need to add both a 4-way and 7-way to your 1995 Ford F-150. First you need to start with a 4-way which for that you'd want the part # 118316. 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 also has a 4-way on the side of it. 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...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

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:
Andrew S
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
Robert C
Test Fit:
Ryan G
Test Fit:
Adam E
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:
Adam R
Expert Research:
Lori W
Expert Research:
Jeffrey L
Video Edited:
Zack K
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Andrew L
Video Edited:
Kathleen M
Video Edited:
Dustin K
Video Edited:
Chris R
Video by:
Andrew K
Video by:
Alan C
Video by:
Zach D
Video by:
Jonathan Y
Video by:
David F
Video by:
Aidan B
Written by:
Tyler C
Updated by:
Adele M
Updated by:
Sarah W
Updated by:
Alexander C
Installed by:
Cole B

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.