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

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

Item # HM40975-11998
Our Price: $87.08
Custom Fit Vehicle Wiring

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Tow a trailer with either a 7-way or 4-way plug with this dual vehicle-end connector. Included pigtail harness hardwires into your vehicle and the connector end mates with the 7-pole socket to form a weathertight seal. 1-800-940-8924 to order Hopkins custom fit vehicle wiring part number HM40975-11998 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring - Vehicle End. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (483)
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Hopkins Custom Fit Vehicle Wiring - HM40975-11998

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

Tow a trailer with either a 7-way or 4-way plug with this dual vehicle-end connector. Included pigtail harness hardwires into your vehicle and the connector end mates with the 7-pole socket to form a weathertight seal.


  • Dual connector lets you hook up to a trailer with either a 7-pole, RV-style plug or a 4-way flat plug
  • Pigtail harness hardwires into your vehicle and connects to 7-way socket
    • Includes color-coded 7-wire leads and 1/2" convoluted tubing
    • Forms weathertight seal on back of socket to keep out moisture and prevent corrosion
  • Rubber gasket provides excellent weather protection
  • Integrated stainless steel spring lets you easily open and close socket covers
  • High-impact ABS plastic construction is extra durable
  • Sturdy steel mounting bracket installs on bumper with included screws
    • Black epoxy coating resists rust


  • 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 warranty

Dimensions of bracket

Wiring Configuration

Wire ColorCircuitWire Gauge
RedLeft turn and stop14 Gauge
WhiteGround10 Gauge
BlueElectric brakes12 Gauge
GreenRight turn and stop14 Gauge
BlackBattery12 Gauge
BrownRunning lights14 Gauge
YellowReverse lights14 Gauge

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

11998 Pollak Pigtail Wiring Harness for 7-Way RV Socket

Installation Details HM40975-11998 Installation instructionsAlternate Instructions HM40975-11998 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring - Vehicle End - HM40975-11998

Average Customer Rating:  4.8 out of 5 stars   (483 Customer Reviews)

Tow a trailer with either a 7-way or 4-way plug with this dual vehicle-end connector. Included pigtail harness hardwires into your vehicle and the connector end mates with the 7-pole socket to form a weathertight seal.


Good product instructions easy to follow, the final product looks great.


Great addition that converts to both 4 pin flat/7pin round all in one connector. Beauty of this connector is it is universal that is plug and play for most if not all OEM trailer wiring. Was plug and play on my 01 Burb.

Chevrolet Colorado

The service provided by George and Lacey was the best part of this transaction. Lacey helped me find the right parts and sent me a video about installation. They both worked to correct my order and customized the delivery date.

The parts were precisely what I needed to get power to the bumper for a small trailer and bike rack. A few comments: order more butt connectors as the mfr sent 6 and there were seven wires on my Colorado. When connecting the tail harness to the truck harness, be sure all the wires on each side are the same length. The yellow wire strippers take some getting used to, so practice on several wires first. I’m an ‘average’ handy person so these last two suggestions didn’t come naturally to me, but overall this was a pretty simple installation. When I tested it and all the lights worked, I was a happy camper.

2017 Hyundai Santa Fe

I have a 2017 SantaFe I have 2 different trailers and need both types of plugs I am using this product along with a curt class III hitch and a curt 56332 wiring harness.
I want the finished outlet to be behind the factory cover I had to modify the Hopkins bracket by bending it in the opposite direction on a angle because the hitch is in the way .a little effort and its great


Great universal product. Use this for all retro fits. System will tell you it’s designed only for certain vehicles but is a great fit for any vehicle if you know what you are doing.


Nice set up. Works well, no problems. If I could change anything, I would have liked the wiring to be longer by 24”.

2008 Ford F-150

Mounted perfectly to existing bracket on 2008 F150 Lariat with factory towing package, cut off connector from wiring harness and heat shrunk wires together to existing harness

Greg - 07/22/2019


This is the same look as a factory install. I was greatly pleased with the overall installation. Super easy to wire up and looks great in the bumper. My truck has the clean factory look for way less than what they had quoted for an install.

Installation installation and wire color coding information is provided and linked above in the product description.
-- Etrailer Expert Mike L - 07/17/2019


I'm new to this camping. Everything I've needed I've been able to find on etrailer and have been very impressed with the quality and service.


Straightforward installation. Does the job.

2021 Chevrolet Colorado

Was missing the butt connectors but a very good product fairly easy to install

I will have our customer service team reach out to you so we can have the missing connectors sent out.
-- Etrailer Expert Jenny N - 06/09/2022

2012 Dodge Ram Pickup

This is a fantastic quality part and an excellent alternative to Ford's OE connector (the difference being this one is far less expensive and does not have the Ford emblem. I used the connector to replace the 7-Pin/4-Pin combination plug on my 2002 Ford Super Duty after swapping the bed/bumper/tailgate from a 2012 Super Duty. It is a vastly superior connector in that the 4-Pin is integrally wired with the 7-Pin as opposed to having the 4-Pin spliced into the harness. I would definitely recommend this part for any towing rig. I eve put one on my father's 1995 Dodge Ram 2500. Don't hesitate to order this one!


great part this save me lot of money diy than taking it else were fit perfect thank you Steve Z. for helping me out.
john m.


Great product for my 1996 F350 Powerstroke. I liked the idea of a detachable socket and plug. Also looks great on the truck, OEM like. I didn't use the supplied butt connectors and just soldered all my wires to my existing oem harness. I Also didn't use the supplied self tapping screws and went with stainless steel bolts and nylon locking nuts for my particular application.

1992 Ford F-150

The trailer plug went bad on my 92 F150 several years ago. This plug is the same as my 10 F350. I like the combination 7 spade/4 pin. Other combos have a rubber flap to cover the 4 pin plug. I doubt I’m that disciplined and I would think that rubber cover would dry rot and break off. This plug has spring closure doors and looks great!

2005 Gulf Stream Crescendo Motorhome

Ordered trailer connector with bracket.It arrived without the bracket.Will now have to wait a week to get it to install.Disappointing.


I have not received my order yet it says it has been delivered. It looks like it got sent back to you with something wrong with the package. So I'm not very happy right now!

Understandably so! I am glad to see that our customer service team is already working on correcting this for you.
-- Etrailer Expert Brooke M - 11/22/2022

2018 Chrysler Pacifica

Bought this trailer connector to use instead of the flat 4 wire connector. Wanted a nice finished look on the rear of the vehicle without any hanging wires. Mounts to the Draw Tite mounting bracket without any modification. Only minor problem I had was with the wiring. The wire colors are not the same between the 4 and 7 pole connector. A call to etrailer got the problem resolved. Great customer service!


The wiring harness was not color coded and not plug and play. One of the biggest piece of crap I ever purchased. Customer service was nope help, passing me off to tech support, who told me how to cut and splice the wiring harness. Not an acceptable solution. I went and bought from another company and had it installed correctly in a matter of minutes. I will never purchase from etraler again...ever

I do have another solution for you. The 7-Pole and 4-Pole Trailer Connector Sockets w Mounting Bracket and Wiring # HM40975-11998 is a hard wire application. If you only needed to connect the plug then you can use part # HM40975
7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End
as it is a direct replacement for many different years, makes and models of Chevy trucks with a factory 7-way including your 2021 Chevy Silverado 2500.
-- Etrailer Expert Jenny N - 11/15/2021

1996 Ford F-250 and F-350

just the right package for older pickup truck update.

2016 GMC Canyon

Great product!
Fits the factory hole
in the bumper perfectly.

Attaching the wires was a pain but that was due to GM saving $1 by just cutting the wire ends and not installing a plug......but they were all there so that was a plus.
If you do install this setup AND you install a hitch, leave the spare tire down while you attach the wires. There's plenty of wire with the plug but the factory wires are up kinda close to the underside of the bed so not a lotta room.

ALSO spend the extra couple dollars and get the heat shrink butt connectors, they're available here in whatever size you need.

Another thing to think about, if you plan on eventually installing bed/ cargo lights any time soon, now is the time to add that extra power wire before you crimp, shrink, and tape the hot wire......

GMC Canyon

Recently purchased a new boat and my 2021GMC Canyon did not come with towing package. I ordered the kit with the 7 wire and 4 wire trailer connector that is made to fit my vehicle. When I received it I went to the etrailer web site and watched the video for install and it took about 20 minutes to install. Video was great, very detailed and easy to follow. I would highly recommend etrailer and have made several orders over the last few months.

Ford F-350 Super Duty

This is a great affordable option to replace your worn out or damaged OEM trailer recepticle. The fit is perfect. It is made by Pollak which is the same as the Ford one you replace. I damaged mine and took the pin connectors out of new housing and installed it on my F350 without splicing wires. Worked perfectly.


Easy to install. Refer to the etrailer YouTube video for wiring guide it was very helpful


I’m glad I chose this over a single plug! No matter what you have on the hitch, you’ll have the plug for it. The pigtail is plenty long enough and the bracket makes for a simple installation. Get some shrink tube or shrink wrap butt connectors as the ones included aren’t going to keep weather out for long.

Show More Reviews

See what our Experts say about this Hopkins Custom Fit Vehicle Wiring

  • Hardwire 7- and 4-Way Connector with Wiring Harness
    Yes, harness # PK11998 fits 7- and 4-Way connector # HM40975. They are also available together as part # HM40975-11998. The wire functions are as follows: Red = Left turn and stop White = Ground Blue = Electric brakes Green = Right turn and stop Black = Battery Brown = Running lights Yellow = Reverse lights
    view full answer...
  • Compatibility of a 7 and 4-Pole Trailer Connector Socket into a 4 foot Pigtail Wiring Harness
    Yes, the Pollak 7- and 4-pole trailer connector part # HM40975 socket is compatible with the 4 foot pigtail wiring harness part # PK11998. Both parts use a standard round U.S. vehicle connector. In fact, we offer these two parts # HM40975-11998 as a package deal! I added a video for you as well.
    view full answer...
  • Trailer Wiring Harness with 7-Way and 4-Way Connector for 2014 Nissan Pathfinder
    The Hopkins Trailer Connector # HM40975 combines with the Wiring Harness # PK11998 to make the part # HM40975-11998. This gives you both a 4-way and 7-way trailer connector.
    view full answer...
  • Trailer Fuse Locations on 2017 Ford Expedition
    I looked at the owner's manual for your 2017 Ford Expedition to find the location of the fuses that are for towing a trailer. You might be best off checking your own manual to verify but here's what I found: In the power distribution box in the engine compartment the trailer lighting fuses and relays are cavities 24, 28, 31, and 39. The fuse for electric trailer brakes is a 30 amp in cavity 18. There are also two fuses labeled "Trailer Tow Module" in cavities 21 and 48. There's also...
    view full answer...
  • Replacement Pigtail for 7-way Trailer Connector on 2015 Audi Q7
    It sounds as if you need the pigtail that connects to the American spec 7-way, is that correct? If so, you'd need part # PK11998. It's also sold together with the # HM40975 connector as part # HM40975-11998. If you're speaking of the gray retaining clip, it is included with the # PK11998 pigtail, but it's not available as a separately sold item. The product description page for the # PK11998 pigtail provides the wire color coding if you scroll down the page I've linked for you a bit.
    view full answer...
    Image 1 for
  • Is the 7- and 4-Pole Trailer Connector Socket a Fit for Ford Trucks
    The 7-Pole and 4-Pole Trailer Connector Sockets w/ Mounting Bracket and Wiring # HM40975-11998 is a hard wire application, as you can see in the linked installation video we made of this being put on a 2008 Ford F-250. If you only need to connect the plug, which is 7- and 4-Pole Trailer Connector Socket # HM40975, that is a direct replacement for many different years, makes and models of Ford trucks with a factory 7-way; for example it is a fit for a 2018 Ford F-150. If you let me know...
    view full answer...
  • Replacement 7-Way Recommendation for a 2004 Chevy Silverado 1500
    Yes, the # HM40975 that you referenced will fit the connector in your picture. The picture is pretty blurry though. So if you are needing to replace that harness as well the part # HM40975-11998 comes with the connector with wires that could get hardwired to the connector in the picture if you were to cut it off.
    view full answer...
    Image 1 for
  • Replacement 7-Way Recommendation for a 2002 Chevy Silverado
    It sounds like you have a surge brake trailer that has a 7-way trailer connector on it and need a 7-way to install on your 2002 Chevy Silverado. The part # HM40975-11998 would be the correct harness for you if you had a 7-way on your truck and it (and the harness), got damaged and was in need of replacing. If you only need the connector without the harness you would want the part # HM40975. This would connect to the harness under your rear bumper. Chances are this would be all that you...
    view full answer...
  • Replacement 7-Way Replacement for a 2011 Ford F-150 Raptor
    What you will need is the Hopkins Custom Fit Vehicle Wiring # HM40975. This is confirmed to fit your 2011 Ford F-150 Raptor, and since the connector is not available without the bracket you would just need to discard the bracket or save it as a spare.
    view full answer...
  • Will Hopkins 7- and 4-Pole Trailer Connector Socket # HM40975 Fit 2011 Jeep Grand Cherokee
    The Hopkins 7- and 4-Pole Trailer Connector Socket # HM40975 that you referenced uses a standard U.S. Car Connector plug (a round 7-pin plug) to connect to the OEM wiring in your Jeep Grand Cherokee. This part is specified as a replacement part to fit your vehicle if it came with a factory 7-way tow package. You can check the type of connector on your Grand Cherokee to see if it matches this part. I have included a photo of a U.S. car connector plug for your reference. Please note that...
    view full answer...
    Image 1 for
  • Will Pollak Trailer Connector Socket # HM40975 Fit Factory Tow Package Wiring on 2007 Toyota Tundra
    The Pollak 7 and 4-Pole Trailer Connector Socket, part # HM40975, is compatible with the OEM wiring harness on your 2007 Toyota Tundra. This socket will plug into the OEM female end socket on the vehicle. If the female socket on your vehicle is damaged or missing I would recommend the Pollak 7 and 4-Pole Trailer Connector Socket with Wiring, part # HM40975-11998. This part is the same connector (# HM40975) with the female socket with pigtail wiring. I am including a link to a video of...
    view full answer...
  • Parts Needed to Install 4-Pole/7-Way on 2003 Chevrolet Silverado 1500 Without Factory Connector
    If your 2003 Chevrolet Silverado 1500 has a round plug at the end of the wiring harness at your rear bumper (that looks like the one in the linked picture) than you can use part # HM40975 to have a combination 4-pole and 7-way trailer socket. If you have just bare wires near the spare you'll instead use part # HM40975-11998 which includes the 4-pole/7-way plus a wiring adapter and connector and butt connectors for splicing your truck's wires. On the truck the yellow wire is the left...
    view full answer...
    Image 1 for
  • How Does the Hopkins 7-Way part # HM40975 Wire to a Vehicle
    The part # HM40975 is designed to fit the round 7-way connector that is found on several vehicles. To install it would require your vehicle to have this round connector. (see picture) If instead you needed a way to hardwire in a 7-way to a vehicle you would need the part # HM40975-11998 instead.
    view full answer...
    Image 1 for
  • 7-Way and 4-Way Recommendation for a 2007 Ford Expedition
    The only 7-way/4-way we offer that would do what you are looking to do would be the # HM40975-11998 that has a connector that plugs into the back of the 7-way. The benefit to this style of connector is that it if you ever need to replace the 7-way you wouldn't have to rewire the whole thing and you could just replace the connector. If you have the round plug already all you would really need is the part # HM40975 though.
    view full answer...
  • Replacement 7-Way Recommendation for a Vehicle 7-Way that Filled with Water and Rusted
    If the connector portion of the # HM40975-11998 filled up with water it had to have been due to it getting submerged or being installed in an area that gets direct water sprayed on it when traveling in rain. We have never heard of one filling with water like you described. You would want to either replace the whole thing or just the connectors with part # HM40975. If it's as rusty as you described it would be very difficult to get it all out. But you could try the product called CLR that...
    view full answer...
  • Replacement 7-way Trailer Connector on 2008 Toyota Tacoma With Factory Tow Package
    The Pollak 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 can be mounted onto your 2008 Toyota Tacoma. If the connector on the rear of your truck is still good, and can plug into the new harness, it will work for you. If you need to hardwire in the connector because it is damaged then you can use # HM40975-11998 that includes the same 7- and 4-way with a pigtail harness.
    view full answer...
  • Replacement 7-Way/4-Way Recommendation for 2014 Toyota Tacoma
    The part # HM40975 is a replacement 7-way and 4-way that will connect to the round connector you have at the rear of your 2014 Toyota Tacoma. If you needed to hardwire the connector as well you would want the part # HM40975-11998 instead.
    view full answer...
  • 7-Way Recommendation for 2017 Toyota Tacoma with Capped 7-Way Connector
    If you have a round plug behind the rear bumper of your 2017 Toyota Tacoma for plugging in a 7-way harness what you would want is the part # HM40975 which will plug right into it. The part # HM40975-11998 includes a harness for hardwiring the harness to the vehicle that would not be needed if you had the connector present already.
    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...
    Image 1 for
  • Replacement 7 and 4-Way Recommendation for 2005 Ford F-250
    The part # HM40975 normally would plug right in to the 7-way wiring of your 2005 Ford F-250, but if for some reason you have a totally hardwired setup your other solution would be to use the part # HM40975-11998 which would allow you to hardwire the setup to your vehicle wiring.
    view full answer...
    Image 1 for
  • Will Hopkins 7-Way and 4-Way part # HM40975-11998 Fit 2017 GMC Sierra 1500
    Your 2017 GMC Sierra 1500 will work great with the # HM40975-11998 that you have but in reality you only will have to use the 7-way portion of the setup. The # HM40975 portion of the setup is just the 7-way and bracket which will attach directly to the 7-way wiring that your truck already has. There would be no need for hardwiring. Check out the install video I attached for more info as well.
    view full answer...
  • 7-Way Trailer Wiring Recommendation for 2017 Chevy Colorado
    Your 2017 Chevy Colorado might have the round socket already to allow the part # HM40975 to install without needing the wiring harness. But if you did not have the connector the part # HM40975-11998 will fit and work well. Check out the install video I attached for more info on how this installed on a similar 2016 Chevy Colorado.
    view full answer...
  • 7-Way/4-Way Kit that Fits 2021 Chevy Silverado 1500
    Yes the 7-way/4-way kit part # HM40975-11998 does fit your 2021 Chevy Silverado but since your truck already has the round connector that comes with this kit you'd only really need the part # HM40975.
    view full answer...
  • Trailer Wiring Harness that will work for 2016 GMC Savana Van with 6-way connector
    If you have a 6-way on your vehicle, there are two routes you can go. You can add a 6-way plug to your trailer or you can switch out the 6-way to a 4-way or 7-way. I would recommend switching out the 6-way on your vehicle to a 4 and 7-way combo such as # HM40975-11998, so that you have the option to haul trailers with different wiring set ups without having to carry an adapter. I say this because 6-way plugs are not very common. If it is a US car connector that you have installed that...
    view full answer...

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