bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Fifth Wheel and Gooseneck Wiring
  5. 7 Round - Blade
  6. 10 Feet Long
Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug

Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug

Item # HM42137
Our Price: $76.60
You Save: 29%
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.

This item qualifies for Free Shipping
Shipping Weight: 2 lbs
In Stock
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

Need help with installation?
Locate installers near me
Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree-angled connector fits into tight spaces. 1-833-496-1390 to order Hopkins custom fit vehicle wiring part number HM42137 or order online at Free expert support on all Hopkins products. Great prices and Fastest Shipping for Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (108)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - HM42137

  • Custom Fit
  • Fifth Wheel and Gooseneck Wiring
  • 7 Round - Blade
  • Hopkins
  • 10 Feet Long

Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree-angled connector fits into tight spaces.


  • Provides 7-way, blade-style connector in your truck bed for hassle-free hookup of 5th-wheel and gooseneck trailers
    • Connector head is designed with 90-degree angle so it fits into tight spaces in truck-bed side rails
    • Lid with oversize hinge opens 180 degrees for easy connection
  • Retains the use of the 7-pole connector at the rear of your truck
  • Installs quickly and easily - no cutting or splicing required
    • Plug T-connector into factory wiring and your vehicle's factory-installed 7-way connector
    • Run 10' long wiring harness from rear bumper to truck bed
  • Offers enhanced weatherproofing with internal seals, corrosion-resistant terminals and rubber-coated copper wiring
  • Constructed of extremely durable ABS plastic
  • Includes self-tapping screws, dielectric grease packet and nylon ties for installation


  • Harness length: 10'
  • Wire gauges:
    • Purple/green/yellow/brown: 16
    • Blue/red/white: 12
  • 3-Year limited warranty

This T-connector wiring harness uses your factory tow package to add a 7-way socket in your truck bed while also retaining the use of the 7-way at your vehicle's bumper. The harness plugs into the back of your 7-way at the bumper and also into your factory wiring. And it provides 10 feet of cord to run the second 7-way connector to your truck bed. Installing a second 7-way connector in your truck bed makes it easy to connect the 7-way plug from your fifth-wheel or gooseneck trailer.

42137 Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Way Blade Plug

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - HM42137

Average Customer Rating:  5.0 out of 5 stars   (108 Customer Reviews)

Mount this 7-way, RV-style connector in your truck bed to simplify hookup of your 5th-wheel or gooseneck trailer. Harness plugs into existing wiring and retains use of factory 7-pole at the bumper. 90-Degree-angled connector fits into tight spaces.


Worth every penny to keep everything in the bed when hooking to a fifth wheel or gooseneck. Very simple install with just needing a holesaw.


Works well. Defiantly better than installing a gooseneck under the bed hitch. You can swap the plate over to a fifth wheel plate with ease. 2 birds one stone. Defiantly recommend

2009 Dodge RAM 2500

Exactly what I needed. The Hopkins Endurance 5th Wheel 90-Degree Harness is truly plug 'n play. Once you decide on the truck bed location for the new 7-pole plug and drill the hole the rest is simply snap together and you're done. The new harness fit perfectly with the factory 7-pin connector and had plenty of length to allow for the new plug to be mounted conveniently in the truck bed wall. No more cable hanging out over the tailgate.

I have used the Hopkins Endurance 90-degree harness monthly over past year since installation. I have also used the factory bumper 7-pole plug as my towing needs required. Both connectors work every time indicating a solid fit and good contact between the factory 7-pin connector and the added Hopkins Endurance connector. Very pleased with both ease of installation and performance.
Steve M - 08/23/2014


Definitely plug and play. No installation or use problems at all! The simple way to add 5th wheel wiring capability!

2001 Dodge Ram Pickup

I originally had ordered a different product but it was back ordered a month which I was ok with. After I placed the order, I received an email stating they had another conector that was basically identical that was in stock and if I wanted to switch to that one, I could call in and switch. So, I called in and they changed my order to that in-stock plug and it was here within a week! Awesome and easy customer service. It was also really easy to truck.

As for installation, it went flawless and I was done in under an hour. Hooked it up to one of my trailers and everything works perfect (including trailer brakes). Very happy with the whole purchasing/installing experience!


Easy to install and it is a quality pro duct.


Replaced old 5th wheel Harness with the Hopkins Endurance and it was a great plug and play fix for my old wireing!!!!!!!

2006 Dodge Ram Pickup

Installation went great drill hole and plug everything in comes with enough wire to put virtually anywhere in the bed. I was very pleased with the quality of the connectors.


It worked as advertised. Easy install.

2003 Dodge Ram Pickup

Very simple 20 minute install. Fast shipping. Second purchase with no issues.


Great product


Such an easy install, simple instructions and plenty of length. The hardest part was my factory plug to unplug!

2007 Dodge Ram Pickup

This harness was a breeze to install. Simple unplug and plug back together, cannot be any easier. Harness was plenty long to locate the plugin anywhere you would choose. Factory style connectors worked perfect. Highly recommend this product and would absolutely buy again. Thanks etrailer for your quality products and wealth of application/installation info available!!!

Very well just as expected.
Adam M - 01/26/2018

2007 Dodge Ram-Pickup

Installed for a friend that had a camper. Plug and play other than the ground. Very straightforward and easy install. High quality product.

Still working well. No complaints.
PAUL S - 07/13/2018

2006 Dodge Ram Pickup

Finally got the right part, my bad the first time, and the Hopkins wiring harness was in my 2006 Dodge Ram truck in less than 30 minutes. Most of your time will be spent drilling the hole in the side of the bed. I used a 2" hole saw vice the 2 & 1/8th (already had the 2" and didn't want to run out and buy another hole saw) and had no problems getting the harness through the hole. Hooked up the trailer and everything worked perfectly. There's plenty of harness, maybe too much, for any application in the truck bed. Great product!

2005 Dodge Ram Pickup

After using this plug adapter for a year I have been very satisfied. It was very easy to install, wiring plug was an exact fit. I use it for my fifth wheel travel trailer. I have not had any problems. Great product, thanks.

2009 Dodge Ram Pickup

Wow what a fantastic experience! It first started when I called to verify I was buying the right 5th wheel wiring kit for my 2009 Dodge Ram 2500. Nicky K was the salesperson that helped me out, she took the time to verify my order and she placed the order for me at that point, I chose the two day delivery option and it arrived on time as she promised.
The endurance professional grade 5th wheel wiring kit part # 42137 was so easy that it took me only 45 minutes to install from start to finish, and most of that time was Running the wire from the bed location to the back of the truck where the factory 7 pin receiver is located. this kit is truly plug and play!! If I could do this in this amount of time and not have any problems then anyone can do it.
I would definitely recommend this company and this product to all my family and friends.


The wiring harness for my gooseneck 7 pole hitch on my Dodge is as advertised. The only problem is I looked under my truck it is not wired with a stock connector. I will have to cut and splice it anyway. Not a problem with the product but with my wiring.

2006 Dodge Ram Pickup

The hitch was better than I thought it would be. Installation was easy with the enclosed instruction sheets. The Quality of the hitch assy. is great. I highly recommend this hitch.
The wiring harness worked great and was easy to install.


Ordered part and it was picked, packaged and shipped same day and arrived when said. I would order from you again. I ordered the 5th wheel harness for bed of truck. Just unplug one wire harness and plug in the other, easy and fast.

2003 Dodge Ram Pickup

Trailer plug can't come unplugged or drag the ground anymore with connection inside of bed.

Still works great
Brian - 04/01/2018


I ordered this adapter harness for me 2002 2nd gen cummins and it plugged right into the factory harness and worked flawlessly. Installation is very easy and all you have to do is ground the white wire and its ready to go. I would definitely recommend using this option instead of cutting and splicing into your truck’s harness.


Well made product. Heavy wiring. Easy to install. Worth the money!


High quality and good instructions. The manufacturer provides plenty of cable to put the additional connector virtually anywhere.

Both continue to work fine!
Bruce B - 08/16/2016


Fast shipping easy install looks good mounted in the bed. Great upgrade for fifth wheel or gooseneck trailers.

Show More Reviews

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

  • Will The Hopkins Fifth Wheel Wiring Harness for a 2008 Dodge 3500 Keep the 7-Way at the Bumper
    The Hopkins 5th wheel wiring harness # HM42137 acts as a T-connector. It will provide a 7-way trailer connector in the bed of your truck while retaining the one at the back too. This fits all 2008 Dodge trucks with factory installed 7-way connectors.
    view full answer...
  • Which Fifth Wheel or Gooseneck Harness Should be Used for 2010 Dodge Ram 3500
    For your 2010 Dodge Ram 3500, you would need 5th Wheel and Gooseneck 90-Degree Wiring Harness with 7-Pole Connector, # HM42137 The 90 degree angle reduces the amount of space the truck bed connector needs making installation easier.
    view full answer...
  • Will In Bed 5th Wheel/Gooseneck Trailer Wiring Harness Fit a 2004 Dodge Ram 2500
    The Valley in bed wiring harness, # HM42137 will fit your Dodge Ram 2500 series trucs. The truck will need to have a factory 7-Way trailer connector for the harness to install in line with the factory wiring. I have included a link to a video that shows a typical installation for you.
    view full answer...
  • Recommended In-Bed 7-Way Trailer Wiring Harness for a 2005 Dodge Ram 3500
    Absolutely, the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness part # HM42137 will give you a 7-way trailer connection point in the bed of your 2005 Dodge Ram 3500 for use with gooseneck/5th wheel trailers and still retain the use of the 7-way trailer connector on your bumper. I have attached an install video of the above harness for you as well.
    view full answer...
  • Can 7-Way Wiring be Used to Power Headache Rack Lighting Functions
    The problem with using 7-way wiring for a headache rack is that there isn't a dedicated stoplight circuit so if the rack has a third brake light you won't find the correct circuit at this harness. The turn signals, running lights, and reverse lights are present though with the # HM42137. I attached a diagram that shows where you'll find them.
    view full answer...
    Image 1 for
  • In Bed Trailer Wiring to Tow Gooseneck Trailer with 2007 Dodge Ram 1500
    We have exactly what you need with part # HM42137. It plugs inline with your 2007 Dodge Ram's factory 7-way so you keep the original connector and can add thi one into your truck's bed to hook up your gooseneck trailer.
    view full answer...
  • 7-Way Kit for Truck Bed of 2005 Ram 2500 for Fifth Wheel Towing
    We have the Hopkins 5th Wheel 7-way kit part # HM42137 which fits your 2005 Ram 2500 and will give you a 7-way you can mount up in the truck bed. This allows you to keep the 7-way at the rear of the truck as well. It installs by plugging inline with the 7-way you have now and then would get installed where you would like in the truck bed.
    view full answer...
  • Installing 7-Way Trailer Connector in Bed of 2006 Dodge Ram
    Hopkins offers a T-Connector type set up, part # HM42137 that would plug inline with the existing 7-way on your bumper and provide a 7-way in your truck bed. The wiring harness is 8 feet long, but any existing slack can be taken up and bundled up under the vehicle with zip ties. Using the T-Type connector will allow a 7-way to remain at the rear bumper while adding one to the truck bed, which you would not have if you simply relocated the existing 7-way to the truck bed. The HM42190 you...
    view full answer...
  • 7-Way Wiring Recommendation for Fifth Wheel 7-Way in the Bed of 2001 Dodge Ram 2500
    Looks like somebody used quick splices to wire in the 7-way on your 2001 Dodge Ram and then when they removed the 7-way they just cut the wires leading to them. Thank you for the picture though as that helps me understand you setup very easily. Since it sounds like you are trying to install a second 7-way in the truck bed of your truck the easiest solution would be the part # HM42137 that would install inline with the factory 7-way wiring harness.
    view full answer...
  • Recommended 5th Wheel/Gooseneck 90 Degree Wiring Harness For A 2008 Dodge Ram Pickup
    When it comes to installing a 5th Wheel/Gooseneck 90 Degree wiring harness I recommend The Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug # HM42137. This harness is confirmed to fit your 2008 Dodge Ram Pickup. Using this harness provides a 7-way blade style connector in your truck bed for a hassle-free hookup of the 5th wheel and gooseneck trailers. The harness length is 10 foot. The wire gauges are below: Purple/Green/Yellow/Brown - 16 Gauge Blue/Red/White...
    view full answer...
  • Is There a Gooseneck/5th Wheel Wiring Harness Available with a Shorter Length of Wire
    The shortest gooseneck wiring harness we offer is the Draw-Tite 5th Wheel and Gooseneck Wiring Harness with 7-Pole for Dodge with Factory Tow Package # 20111. This wiring harness is 7 feet long and will install behind the factory 7-Way on your 2007 Dodge Ram Pickup. The Hopkins Endurance 5th Wheel and Gooseneck Wiring Harness # HM42137 that you referenced is a great option, however it does not come in a length shorter than 10 feet. Typically the extra wire from the harness is bundled...
    view full answer...
  • Looking to Add Plug and Play 7-Way Wiring Harness to Bed of 2007 Dodge Ram 3500
    As long as your 2007 Dodge Ram Pickup is equipped with a factory 7-way, you can use the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness, # HM42137. This harness will plug into the existing wiring to give you a 7-way in the bed and also retain the use of the 7-way at the back of your truck. I have included a video for you. The 7-Way Pre-Wired Car Connector, # 20023, is not a plug and play option. Wiring would be required.
    view full answer...
  • Trailer Wiring Harness for an In-Bed Camper for a 2002 Dodge Ram 2500
    Trailer connector # 20135 is meant as a replacement for the factory 7-Way trailer connector on a 2002 Dodge Ram. If your truck did not come with a factory 7-Way then this connector will not work. If it does have a factory 7-Way then I think I have a better option for you since you need the connection to be more at the front of the bed for the camper. You can use a 5th wheel/gooseneck harness and connector, # HM42137. This will plug in line with the factory 7-Way wiring. Normally the connector...
    view full answer...
  • Can Second In-Bed Fifth Wheel 7-Way Harness Be Installed On 2002 Dodge 3500 Truck
    Although I have not heard of someone installing a second 7-way connector in the bed of their truck, it could be done. I strongly recommend making sure that you use dielectric grease like part # 11755 to make sure you are receiving the best chance for the proper amount of current with your wiring. You will want to make sure you secure the wiring so that it has no chance of separating under the truck. As I said I have not heard anyone say they were installing an additional connector so...
    view full answer...
  • Availability of Dodge Adapter Harness to Move 7-Way from Rear of Truck with Square Connector
    I believe we have exactly what you are looking for. The Hopkins 7-Way Harness part # HM42137 is a kit that plugs into the square connectors of your truck and allows you to install a second 7-way elsewhere in the truck bed. Typically this is installed up near the wheel well for gooseneck or fifth wheel applications. The harness is a bit longer than you need at 10 feet but would still work well.
    view full answer...
  • Recommended Wiring Harness for an In Bed 7-Way Connector on a 2000 Dodge Ram
    To add a 7-Way connector to the bed of your 2000 Dodge Ram 2500 you will need the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness item # HM42137. This harness puts a 7-way connector in the bed of your truck and allows you to keep the one on your bumper. This makes hooking up to your 5th wheel or gooseneck trailer easier and more convenient. I have linked an installation video below. To replace the 7-way on your bumper you're going to want the Hopkins Endurance Quick-Install...
    view full answer...
  • Installing a 7-Way and Brake Controller on a 2006 Dodge Ram
    If the 4-Way did not come on the truck from the factory, then there probably will not be a brake controller connector under the dash. Even if it is a factory 4-Way, not all of the 2005-2007 Ram trucks that were equipped with a 4-Way from the factory had a brake controller connector. Your truck may not have one. If you have one, it should be under the dash, just to the right of the emergency brake pedal. I have added a link to a help article about installing a brake controller on Dodge...
    view full answer...
  • Recommended Underbed Fifth Wheel Kit For Signature Series Fifth Wheel on 2008 Dodge Ram 3500
    We have just what you are looking for. The Under-Bed Rail and Installation Kit, part # RP30074 will work well with your Signature Series fifth wheel hitch. This system leaves you with no rails in the bed of your truck. I have attached a link to an installation video for this system you can check out. Another item you may be interested in is an in-bed wring harness for your fifth wheel. I recommend the Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness, part # HM42137. This...
    view full answer...
  • Which B & W Turnover Ball Gooseneck Hitch for 2009 Dodge Ram
    The correct B & W Turnover Ball Gooseneck Hitch for your 2009 Dodge Ram would be part # BWGNRK1316. To install a 7-way trailer connector in your truck bed, use part # HM42137. I've linked you to an install video for the wiring harness as well as to the instructions for the Turnover Ball gooseneck.
    view full answer...
  • Fit of Draw-Tite # 9464-35 Hide-A-Goose Gooseneck Hitch on 2008 Dodge Ram 2500
    The Draw-Tite # 9464-35 Hide-A-Goose Gooseneck Hitch you referenced will fit your 2008 Dodge Ram 2500. If you need a 7-way trailer connector installed in the truck bed, you could do so using part # HM42137. If you click the provided links, you can see install videos for the hitch and the in-bed trailer connector.
    view full answer...
  • Gooseneck and 5th Wheel Wiring Harness Recommendation for a 2007 Dodge Ram 2500
    There is a fifth-wheel and gooseneck wiring harness for your 2007 Dodge Ram 2500 Pickup. You will want a Hopkins fifth-wheel and gooseneck wiring harness, part # HM42137, for your Ram. I have attached an installation video for this product on a very similar truck for you to check out. You may also be interested in purchasing some Dielectric Grease for Electrical Connectors, 2 oz., part # 11755. It is always a good idea to use dialectic grease when making electrical connections, to prevent...
    view full answer...
  • Pin Locations for 7 Way Vehicle Connector on 2004 Dodge Ram 3500 Diesel
    I have attached a help article and a diagram which gives the pin location for a 7 way connector like the Hopkins Endurance, # HM42137, that is compatible with your 2004 Dodge Ram 3500 Diesel.
    view full answer...
    Image 1 for
  • Will a Gooseneck Hitch for a 2004 Dodge Ram 1500 Fit a 2006 Dodge Ram 1500
    I believe what you are referring to is the B&W Turnoverball Underbed Gooseneck Trailer Hitch part # BWGNRK1316. This hitch will fit a 2002-2008 Dodge Ram 1500 for the exception of the mega cab models. Therefore, as long as the "2006 Dodge" you are referring to is a Ram 1500 without the mega can then yes, the B&W Turnoverball Underbed Gooseneck Trailer Hitch part # BWGNRK1316 will work for you. If you do not already have an in-bed 7-way on the 2006 Dodge Ram, I recommend using the Hopkins...
    view full answer...
  • Compatibility of Curt 5TH Wheel Rails With RBW Hitch On a 2002 Dodge Ram 3500
    Yes, the Curt Universal Fifth Wheel Base Rails # C16200 are the correct rails for your 2002 Dodge Ram 3500. These rails are the industry standard rails that will fit your RBW 5th wheel hitch that is designed to fit the industry standard rails. I do recommend installing a Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness # HM42137 to attach to your factory trailer wiring so that you can plug in your trailer wiring inside the bed of your Ram. This protects your tailgate from...
    view full answer...
    Image 1 for

< Previous

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

  • Why

    At we guarantee:
  • 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:

Employee Frances L
Edited by:
Frances L
Employee Tyler C
Written by:
Tyler C
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Joshua S
Video Edited:
Joshua S
Employee Chris R
Video Edited:
Chris R
Employee Laura H
Updated by:
Laura H
Employee Alexander C
Updated by:
Alexander C

At 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.

Product Experts Available Now!
Call 1-833-496-1390