1. Custom Fit Vehicle Wiring
  2. Hopkins
  3. Custom Fit
  4. Fifth Wheel and Gooseneck Wiring
  5. 7 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
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Hopkins Fifth Wheel and Gooseneck Wiring - HM42137
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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. Call 800-298-8924 to order Hopkins custom fit vehicle wiring part number HM42137 or order online at etrailer.com. Free expert support on all Hopkins products. Guaranteed Lowest Price 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.
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  • Reviews (69)
  • Q & A (47)
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Hopkins Custom Fit Vehicle Wiring - HM42137

  • Custom Fit
  • Fifth Wheel and Gooseneck Wiring
  • Hopkins
  • 7 Blade
  • 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.


Features:

  • 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


Specs:

  • 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 Reviews

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

Average Customer Rating:  5.0 out of 5 stars   (69 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.

- HM42137
by:
2006 Dodge Ram Pickup

The product showed up sooner than expected and was a perfect fit and was installed in about 10 minutes and works perfect. 603646



- HM42137
by:

Product was easy to install. Snapped right into factory wiring cut bed liner and ran four self tapping screws in. 409005



- HM42137
by:

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. 800924



- HM42137
by:

Easy to install. Works great. 756154



- HM42137
by:

This was used on a new install on a truck. Everything fit were it was suppose to. Love the plug and play. Still working good today. No cons 746755



- HM42137
by:

Fast shipping easy install looks good mounted in the bed. Great upgrade for fifth wheel or gooseneck trailers. 722653



- HM42137
by:

Excellent price, quality construction, super easy installation. Took less than 20 mins to install start to finish. 649141



- HM42137
by:

Great product. Easily installed. No wire splicing needed. 609898



- HM42137
by:
2001 Dodge Ram Pickup

Took about 15 mins to install because I predrilled the hole in the bedside. Few moments later I was pulling a trailer and it works great! 525995



- HM42137
by:
2004 Dodge Ram Pickup

Very pleased with the service and product. Very easy to install, the video is a nice touch. Will be ordering again in the near future. 514194


Comments
Work’s great, should of done this years ago. Great product.
Pierre - 06/02/2019

56038

- HM42137
by:

Good product good fit. 453823



- HM42137
by:

Great product easy install would buy ag ain 431322



- HM42137
by:
2001 Dodge Ram Pickup

Very easy to install only took a few minutes, just plug and play very simple great product !!! 410593



- HM42137
by:
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. 405333


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

40876

- HM42137
by:
2001 Dodge Ram Pickup

easy to install, quality product 390986


Comments
Thanks for the great review on our HM42137 Wiring Harness, Trent!! We at Hopkins are happy that you are pleased with this product. If you have any concerns or questions, please get in contact with etrailer customer service. Thank you!
Hopkins C from - 06/13/2017

24960

- HM42137
by:
2007 Dodge Ram Pickup

Great product, easy to install, everything went together great. 379574



- HM42137
by:
2006 Dodge Ram Pickup

I would recommend these products to anyone, every thing I got worked perfectly thanks for a quality product 376160



- HM42137
by:
2004 Dodge Ram Pickup

Product arrived on time and complete. This is a complete kit with every thing you need. It was easy to install and very high quality. Had install video on website. Love the plug and play no wire to cut or splice. 371942



- HM42137
by:
2006 Dodge Ram Pickup

Great service and delivery. Harness install was easy, works perfect! Thanks! 371884



- HM42137
by:
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. 370434



- HM42137
by:
2003 Dodge Ram Pickup

Trailer plug can't come unplugged or drag the ground anymore with connection inside of bed. 361515


Comments
Still works great
Brian - 04/01/2018

36661

- HM42137
by:

good quality parts very happy 343738



- HM42137
by:
2001 Dodge Ram Pickup

Good quality 340554


Comments
No issues
Scott - 02/13/2018

34671

- HM42137
by:
2006 Dodge Ram Pickup

Works well 333393



- HM42137
by:

Works great it easy to take in and out you won't be disappointed! 317377


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Show More Reviews

Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • 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...
  • 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.
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  • 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.
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  • 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...
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  • 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...
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  • 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.
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  • Best Underbed Gooseneck Trailer Hitch with Flip-Over Hitch Ball for 2008 Dodge Ram 2500
    The best underbed gooseneck trailer hitch with a flip-over hitch ball for your 2008 Dodge Ram 2500 is the B&W Turnoverball Underbed Gooseneck Trailer Hitch because of its powerful construction, and because it has a square base for its hitch ball which ensures optimal strength compared to hitches that have a ball with a round base, which allow movement at the hitch ball connection. The correct fit will depend on your bed size and if you have a Mega Cab or not: - 2008 Dodge Ram 2500 6-1/2...
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  • 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.
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  • 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...
  • 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...
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  • Should the 16K or 18K B&W Patriot 5th Wheel Hitch be Used for a 16,000 lb GVWR Trailer
    You are correct. Even though the 16K B&W Patriot # BWRVK3200 is a great option, if the GVWR of your 5th wheel Montana 3120RL is 16,385 you do want to give yourself a safety margin. We typically recommend having at least 1,000 lbs - 2,000 lbs of "cushion" between the GVWR rating of your trailer the the hitch so the 18K Patriot # BWRVK3255 is the perfect solution. It looks like you put a 2003 Dodge Ram Pickup in as your vehicle. If your Dodge Ram doesn't already have a 7-Way connector...
    view full answer...
  • Will a HiJacker 5th Wheel Trailer hitch Fit Curt Rails in a 2004 Dodge Ram 3500 Long Bed
    It looks like your HiJacker 5th wheel hitch has the 4 tabs at the corners of the base that fit in industry standard above the bed rails. On industry standard rails there are 3 sets of mounting holes. The inner set is 10 inches apart on center, the next set out are 20-1/2 inches apart on center, and the outer set is 29 inches apart on center. From front to back the mounting holes are 22 inches apart on center. If the mounting tabs on the hitch are spaced 10, 20-1/2, or 29 inches apart...
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  • Fifth Wheel/Gooseneck Trailer Wiring Harness for a 2001 Dodge Ram
    The 2001 Ram uses different connectors, so you would want to use the Hopkins # HM42137 to install a 7-way connector in your truck bed. To install, you would use a hole saw to drill a 2-1/8 inch hole in the truck bed where you want the connector located. Push the wiring through the hole, and secure the connector to the bed sidewall using the supplied hardware. From under the truck, pull the wiring through to the underside of the truck. Trace the wiring harness from the 7-way on the rear...
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  • 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...
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  • B and W Sliding Fifth Wheel Hitch for 2007 Ram Mega Cab Short Bed With Existing Turnover Ball Hitch
    The B and W Fifth Wheel Hitch, part # BWRVK3400-5W is exactly what you need. It will drop right into your existing B and W Turnover Ball gooseneck hitch. The slider will allow you to move the fifth wheel head to the rear, for maximum clearance between the front of the fifth wheel and the rear of the truck cab during low speed maneuvering. The hitch would be slid into the forward position for normal driving. Since you already have a gooseneck hitch, you likely already have a 7-way connector...
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  • Are All Components Included the Hi-Rise Gooseneck and 5th Wheel Trailer Hitches
    Both the Draw-Tite Custom Underbed Installation Kit, # 9460-39-5W, and the Hi-Rise 5th Wheel Trailer Hitch, # 9480-5W, will have all the needed equipment to connect a gooseneck or 5th wheel trailer to your 2000 Dodge Ram truck. However, components like vehicle wiring, brake controller, or safety chains will not be included with these the two hitches. If needed, I recommend the Tekonsha Prodigy P2 Brake Controller, # 90885, with the Brake Controller Wiring Harness, # 3020-P. I also...
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  • 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.
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  • Parts Needed to Flat Tow a 1998 Toyota RAV4 Behind a 2004 Dodge Ram 3500 with a Truck Bed Camper
    Before flat towing your 1998 Toyota RAV4 you'll want to verify with your owner's manual or with Toyota that it can be flat towed without causing any damage to it. From my research if it has a manual transmission there isn't a problem but the automatic transmission model cannot be flat towed with all 4 wheels on the ground. To tow the RAV4 you'll need a base plate kit, tow bar, wiring to power the lights, a braking system, and likely a high-low adapter. Plus, in your case you may need...
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  • Is Curt 5th Wheel Base Rail Kit Compatible with RBW 15K 5th Wheel Hitch on a 2007 Dodge Ram 1500
    Yes, the Curt Semi-Custom Fifth Wheel Installation Kit # C16303-200 that fits your 2007 Dodge Ram 1500 is compatible with your RBW 15K 5th wheel hitch. If you don't already have a 7-Way installed in the bed of your pickup then I also recommend installing the Hopkins # HM42137 to help make connecting and disconnecting the wiring on your 5th wheel much easier.
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  • Can a 2006 Dodge Ram 1500 with 4.7L V8 Tow a 5th Wheel Trailer
    The towing capacity of a 2006 Dodge Ram 1500 will vary based on tire size, bed length, transmission type, axle ratio, and drive style. If you can provide me with all of these metrics then I would be happy to provide you with an exact towing capacity for your Ram 1500. However, it looks like the most well equipped model only has a maximum towing capacity of 7,300 lbs. Therefore, the weight of your 5th wheel trailer cannot exceed 7,300 lbs. The length of the trailer is more or less irreverent...
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  • 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...
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  • Recommended Components for Installing the B&W Patriot 5th Wheel Hitch in a 2004 Dodge Ram 2500
    For your 2004 Dodge Ram 2500, the B&W Patriot 5th Wheel Trailer Hitch, # BWRVK3200, and B&W Custom Base Rails and Installation Kit, # BWRVK2600, work well with an 8 foot bed. The installation kit brackets will install under the bed and mount to existing holes already in your Ram's frame. If you have a 6 foot or less bed on your truck, then it is recommended that a slider 5th wheel hitch be used to gain the correct amount of clearance between the cab of your truck and the front of your...
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  • Installation Hardware For PullRite Hitch In 2007 Dodge Ram 2500 Truck
    The frame brackets we offer like part # RP50140 will probably work with your bed rails if they are designed to work with industry standard rails. To be sure, you should use brackets and rails from the same manufacturer to be sure. When you use a brackets and bed rails from two different manufacturers the weight capacity will not be known because they are not tested together. If your hitch will work with industry standard rails I recommend part # RP50140. If you need a wiring harness...
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  • Installing 5th Wheel Hitch on 2004 Dodge Ram Using Universal Install Kit from 1989 GMC Truck
    Can you tell me who manufactured the kit you have? Without that information, it's pretty hard to say. Assuming you used the Reese Universal Fifth Wheel Hitch Install Kit, part # RP30035 to install the hitch in your 1989 GMC, you could reuse your existing bed rails and frame brackets. To install the bracket/rail kit in your 2004 Ram, you'd need another additional bracket, part # RP58023. You'd also need a replacement hardware kit, part # 58164, as the hardware used to connect the brackets...
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  • 5th Wheel Trailer Hitch and Installation Kit for a 2004 Dodge Ram 1500 Long Bed
    Slider hitches can slide back towards the tailgate of the truck which allows for more clearance between the trailer and the truck cab when making turns. Short bed trucks pretty much require a slider for most 5th wheel towing applications because the distance between the centerline of the hitch and the back of the truck cab is so short. If you have a long bed truck then you don't have to worry about clearance and you can use a fixed 5th wheel hitch. For your 2004 Dodge Ram 1500 long bed...
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  • 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...
  • Placing Fifth Wheel Hitch Install Bed Rails in Bed of 2003 Dodge Ram 3500 Long Bed
    The distance from the rear edge of the truck bed (NOT the tailgate) to the rear edge of the rear bed rail of the Reese # RP50140-58 fifth wheel hitch install kit is 28-1/4 inches. You can find this information on page 4 of the installation instructions, which I've linked for you. If you need a 7-way trailer connector installed in the truck bed, you can do so using part # HM42137. I've also linked you to install videos for the fifth wheel rails and the in-bed 7-way trailer connector.
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  • Reese Elite Series Underbed Rail and 5th Wheel Hitch Compatible with 2008 Dodge 2500 Short Bed
    The Under-Bed Rail and Installation Kit for Reese Elite Series 5th Wheel Trailer Hitches # RP30074 is a fit for a 2008 Ram 2500 with a 6-1/2 foot bed. This underbed system has an 18,000 lb max capacity. It will work with the Curt A series and Q series 5th wheel hitches. I recommend the Curt A20 5th Wheel Trailer Hitch head # C16540 along with the # C16020 or the Curt Q20 # C16530-16020. Both these hitches will fit the Elite Series puck locations and will still allow you to tow the...
    view full answer...




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Info for this part was:

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

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