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  1. Custom Fit Vehicle Wiring
  2. Demco
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  4. Fifth Wheel and Gooseneck Wiring
  5. 7 Round - Blade
  6. 10 Feet Long
Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long

Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long

Item # DM8555002
Our Price: $101.96
You Save: $21.49
Custom Fit Vehicle Wiring

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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 connector fits into tight spaces. 1-833-496-1390 to order Demco custom fit vehicle wiring part number DM8555002 or order online at Free expert support on all Demco products. Great prices and Fastest Shipping for Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (48)
  • Q & A (0)
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  • Why etrailer?

Demco Custom Fit Vehicle Wiring - DM8555002

  • Custom Fit
  • Fifth Wheel and Gooseneck Wiring
  • 7 Round - Blade
  • Demco
  • 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 connector fits into tight spaces.


  • Provides 7-way, blade-style connector in your truck bed for hassle-free hookup of 5th-wheel or gooseneck trailer
    • Connector can be mounted in truck bed sidewall, tailgate post, or wheel well
    • 10' Long, insulated wiring harness easily reaches from rear bumper to truck bed
  • Plugs into factory wiring - no cutting or splicing
    • Requires that truck have factory tow package
    • Retains use of factory 7-pole connector at rear of truck
  • Offers enhanced weatherproofing with corrosion-resistant terminals and rubber-coated copper wiring
  • Lid with oversize hinge opens 180 degrees for easy connection
  • Constructed of extremely durable ABS plastic
  • Includes self-tapping screws and nylon ties for installation


  • Harness length: 10'
  • 5-Year limited warranty

8555002 Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10'

Installation Details DM8555002 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long - DM8555002

Average Customer Rating:  4.9 out of 5 stars   (48 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 connector fits into tight spaces.


Ordering was great, delivery was quick, but they dumped all the boxes in the middle of my drive and left, without letting me know. They couldve been stolen. Prices are high compared to others and previous orders I was able to get discounts. The hitch box was completely destroyed, taped and half open in transit. Hopefully no parts are missing. Something has to change. Destroyed boxes equals destroyed products.

2022 Dodge Ram Pickup

The Demco 5th Wheel/Gooseneck p/u bed connection is just what I needed. I have always just draped the connection from the trailer over my tailgate and down to the 7pin connector on the bumper, but this is so handy to have and makes it a neater connection. Since my 2022 Ram 2500 came with the hole already provided in the bed wall, it was a breeze to install.


Perfect fit. Arrived to me quickly.
Paula at etrailer!

Great product!
Rick - 05/06/2021


Not to difficult to install. It will require 2 people to get the bolts torqued down. Handles a 14000 lb fifth wheel with ease

2019 Ram 2500

The video was fantastic as well as questions being answered in regards to my specific truck. Thanks again..


Easy install!!!!


Easy install. Connected to factory harness and was in in about 1/2 hour.


Need to look at [online] videos to see how to get the old connection apart. Hard to tell under the truck. Product is fine.

I recommend watching the video install that we have on a 2016 Ford F250 at mark 2:51 to see how we access the back of the seven way.
-- Etrailer Expert Jenny N - 03/29/2022

2017 GMC Sierra 2500

Nice heavy duty wiring and plug ends. Great instructions and pretty easy install.

2014 Dodge Ram Pickup

Product installed well, looks very professional. Matches factory wiring.


Good product.


Good product, worked well for what I ne eded.


makes for a clean installation

2016 Ford F-250-Super-Duty

Wiring harness was easy to install and is holding up nicely a year and half later. Great product and price too from etrailer.

2013 Ford F-250 and F-350 Super Duty

Have not yet installed, but a well built part with clear and concise installation instructions. Plug and Play!

Still happy with all of it.
Charley S - 10/23/2017

2006 Chevrolet Silverado

While I had to wait for the product because of it was back ordered, the wait was not unreasonable and the etrailer staff keep me updated the whole time. The harness is high quality. Service was top notch.

Ram 3500

Easy quick install and plenty of cable to run this to any location within the bed of your truck. i installed this in my New 2020 GMC 3500 Denali in less than 30 minutes!! Perfect fit as always from etrailer!!

2016 GMC Sierra 2500

directions are miss leading . 2" hole isn't big enough as another tab has been added which makes swinging the plug thru the hole impossible . I have a dremel tool at home and ground a tab area for the tab to go thru and was easy as pie then . Plug hook up easy and all was good after getting it thru the hole.


both products were shipped well packed and undamaged very impressed with the customer service and the shipping thanks again

good quality very satisfied thanks
Gregory - 04/04/2019


Part was just like described. Fast deli very!!


It is just as described. Shipping was very quick.


It is long enough, dose what I needed. Nice polite people to deal with. I got confuse when P.O. kept saying the cable cleared SLC P.O. and on way to me. Thank you and enjoyed doing business with you! Richard


Simple hook up


Bonjour, très bon produit, connexion fait pour mon camion et facile à installer.


Good product fast shipping, I highly recommend etrailer

Show More Reviews

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

  • Where are the Connections Under the Hood of a 2013 GMC Sierra to Complete 7-Way Wiring
    Under the hood of your truck there are a few connections that need to be made near the fuse box in order to complete the 7-way's wiring. This will allow the brake output and 12 volt accessory circuit to be complete. Check out the help article I attached to see how to do this. You will have to scroll about half way down the page to see how this is done.
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  • Trailer Turn Signals and Brake Lights Not Working with 2011 GMC Sierra
    Chances are the problem you're having is caused by blown fuses. There are actually two fuses that service these lights. Your truck will have a fuse for the left turn signal and left brake light and another fuse for the right turn signal and right brake light. According to the owner's manual of your 2011 GMC Sierra the fuses are fuses 1 and 3 in your engine compartment fuse box. Replacing these will likely solve your issue. However, being that your truck isn't that old it's more than...
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  • Is Sliding Hitch Needed on 2019 Chevy Silverado 1500 if Trailer Has Orbital Pin Box
    The seller was correct and you will not need a new fifth wheel hitch for your 2019 Chevy Silverado 1500 since you have the MORryde Orbital Pin Box as this is a rotating pin box which will allow you to make a turn because it adds clearance. So you're good to go with your Reese hitch and won't have to add the expense of a new fifth wheel hitch. The only thing you may need for your '19 Silverado 1500 if you don't have one is a fifth wheel wiring harness, and for that I recommend the Demco...
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  • Does Demco 5th Wheel/Gooseneck Wiring Harness Fit 2020 Ram 2500
    So long as you have the factory 7-way, yes, the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug # DM8555002 does fit the 2020 Ram 2500. This harness plugs into the factory wiring on your Ram and will allow you to use the 7-way at the rear of your vehicle as well if you also have a bumper tow trailer. This harness even includes the mounting screws for installation. I have added a link to a video review for you to check out as well of the Demco 5th Wheel/Gooseneck...
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  • In Bed 7-Way Connector for a 2022 Chevrolet Silverado 1500
    Yes, we do have a wiring harness that will add a 7-way connector to the bed of your 2022 Chevrolet Silverado 1500. It is the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long item # DM8555002. This harness will put a 7-way connector inside your Chevy's bed and allow you to keep the one on your bumper. I have attached an installation video.
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  • Does Demco 5th Wheel/Gooseneck Wiring Harness # DM8555002 Fit 2022 Ford F-250
    Due to the universal nature of the 5th Wheel/Gooseneck trailer wiring kits like the part # DM8555002 that you referenced we do know that this harness does fit your 2022 Ford F-250 although it may not show that in the fitguide at this time (February 2022). Since basically all 7-way harnesses are made the exact same way these kits basically fit any truck that has one since it plugs inline with the standard 7-way connector.
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  • Harness Length and Wire Gauge of Demco 5the Wheel/Gooseneck Wiring Harness # DM8555002
    The harness length of the Demco 5the Wheel/Gooseneck Wiring Harness # DM8555002 is 10 foot and the red, brown, green, and yellow wires are 14 gauge, the blue wire is 12 gauge, and the black and white wires are 10 gauge.
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  • Recommended In Bed 7-Way Wiring Harness for 2023 Chevy Silverados
    To add a 7-way connector to the bed of your truck and keep the one on your bumper you will want the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug item # DM8555002. This wiring harness is confirmed to fit the new 2023 Chevy Silverados. I have linked an installation video below.
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  • Recommended Demco 5th Wheel Adapter For GMC OEM Prep Package And Husky 26K Hitch Compatibility
    The Demco 5th Wheel Rail Adapter for Chevy/GMC OEM 5th Wheel Towing Prep Package - 21,000 lbs # DM6194 will fit into your 2017 GMC Sierra 3500 Factory Prep Rails and give you the industry standard rails you need for your Husky 26K 5th wheel hitch. This won't give you the 26K capacity of your hitch, but will give you the capacity to pull your 18K Fuzion Triple Axle Toy Hauler. At this time there is not a higher capacity adapter available from any manufacturer. I also suggest adding a...
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  • Weight and Height of Demco 18K Hijacker # DM8550024
    The Demco Hijacker Autoslide 5th Wheel Hitch # DM8550024 referenced in your question, which is confirmed to fit your 2015 Ford F-350 with the factory rail kit, has a total weight of 289 pounds. The hitch head can be removed, which has a weight of 65 pounds. You will need two people to remove or install the hitch. The Demco Hijacker has 3 possible hitch height settings, which are measured from truck bed floor to the top of the hitch head. It can be set at 15-1/2 inches, 16-3/4 inches or...
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  • Sliding 5th Wheel Hitch for Towing Camper on 2004 Dodge Ram Pickup w/ Short Bed
    The Demco Hijacker Autoslide 5th Wheel Trailer Hitch, part # DM8550034 will work great for towing your camper with your 2004 Dodge Ram Pickup. The 5th Wheel Trailer Hitch is compatible with your Husky base rails so you will not need a new rail kit. The built in slider will give you an additional 14 inches of clearance when turning so this should offset the foot difference in your new, bigger camper. The Hijacker Autoslide has a weight capacity of 18,000 lbs so you will just want to assure...
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  • Demco Hijacker Autoslide For 2008 Dodge Ram 2500 Shortbed Quad Cab With Above Bed Rails
    Most hitches use standard rails, so you would want the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 18,000 lbs # DM8550034. I've attached a couple videos for you. The other hitch your mentioned utilizes underbed rails. I also recommend the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long # DM8555002 that will give you a 7-way connection in the bed of your truck for easy accessibility.
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  • Recommended 5th Wheel Hitch for 2018 Ford F-250 with 6-3/4 Foot Bed
    Yes, the 2018 Ford F250 will work fine for the 5th wheel you mentioned. I recommend going with the factory rail kit to give you a clean bed when you are not towing. I also recommend the Demco Hijacker Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K # DM8550024 which will automatically slide to give you turning clearance for your short bed truck. This particular hitch it designed specifically for your truck. If you prefer a manual slider option,...
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  • Height Dimensions of 18K Demco Autoslide 5th Wheel Hitch on 2017 Ford F-250 with 5th Wheel Package
    The Demco Hijacker Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K # DM8550024 has 3 hitch height options from the floor of the truck bed to the hitch plate. The low position measures 15-1/2 inches, the mid position is 16-3/4 inches, and the high position is 18-1/4 inches. I've attached a photo to assist. For easy connection and a clean look, I recommend the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug # DM8555002 to add a...
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    Image 1 for
  • Recommended Lube Plate For Demco Hijacker Autoslide 5th Wheel Hitch
    You can use the Curt 10" Fifth Wheel Trailer Hitch Lube Plate # 16721 with your Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 18,000 lbs # DM8550034. This will help with connecting your truck to your trailer. You may also be interested in the Demco 5th Wheel/Gooseneck 90-Degree Wiring Harness with 7-Pole Plug - 10' Long # DM8555002 to add a second 7-way wiring connection to the bed of your truck for easy access to your wiring connection.
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  • Comparing Demco 5th Wheel Auto Slide Hitches 21K DM8550038 and 18K DM8550024
    Demco 5th wheel hitches # DM8550038 and # DM8550024 are both confirmed fits for your 2015 Ford F-350 with the factory installed 5th wheel kit. Both are drop-in installations and both hitches include the automatic slider feature and a generous 14-inches of front-to-back travel for excellent turning clearance. The Demco hitches do include cushioning in the form of polyurethane dampeners that work to reduce noise and shocks from road surfaces. Construction of the Demco hitches is quite beefy;...
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  • Recommended Rails And Brackets For 2017 GMC Sierra 1500 And Hijacker FWH24PA 5th Wheel Hitch
    I reached out to my contact at Demco and for the old FWH-24PA hitch you will need rails # DM6014 as you mentioned that are different from the industry standard size. He said you can use the custom bracket with those rails for your 2017 GMC Sierra 1500, so I recommend using the Demco Hijacker Premier Series Custom Mounting Brackets for 5th Wheel Above-Bed Base Rails # DM8552027 which are a custom fit for your truck. I recommend adding the second 7-way to the bed of your truck for easy access...
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  • Demco Adapter Plate for 2013 Ford F-350 with Factory 5th Wheel Prep Package
    Demco part 6077 is their 18K auto-slide hitch head assembly and to install this 5th wheel hitch in a 2013 Ford F-350 with the factory 5th wheel prep package you can use kit # DM6033. For a wiring harness you can use Demco # DM8555002.
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  • Recommended Autoslide 5th Wheel Hitch For 2013 Ford F-250 With 6-3/4 Foot Bed & Factory Prep Package
    We have two Demco Hijacker Autoslide 5th wheel hitches that are compatible with the factory rail kit. This means you don't need an adapter like the Reese # RP30156 to use it. The Demco Hijacker Autoslide is an excellent choice for your 2013 Ford F-250 Platinum with crew cab and 6-3/4 foot bed. This autoslide makes it easy for you to navigate turns as it automatically moves the pivot point of the trailer as you turn to provide the clearance needed. There are two different sizes available...
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  • Recommended 5th Wheel Hitch for a 2005 Ford F-150 5-1/2 Foot Bed
    I can help explain this evolution to you to help you better understand. The reason short bed trucks like your 5-1/2 foot Ford F-150 needed the sidewinder was because of clearance. A sliding hitch alone wouldn't give the camper/rv enough room when turning to not impact the truck cab. Due to popular demand the Sidewinder was born and allowed many short bed truck customers to tow because it moved the pivot point from a standard non-sliding hitch back 22 inches. The Sidewinder essentially...
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  • Recommended Auto-Slide 5th Wheel Hitch for 2016 Silverado 1500 Double Cab
    The 2017 Jayco Eagle 29.5FBDS has a gross trailer weight rating of just under 10K. Page 333 of the online manual for your 2016 Silverado 1500 indicates a towing capacity for the double cab with regular bed that ranges across the engines types from a low of 11K up to 17.7K so the truck seems good to go. I still suggest checking your manual. I recommend a custom-fit 5th wheel base rail installation kit since this type reduces drilling and overall installation time. Demco offers USA-made...
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  • Recommended 5th Wheel Hitch with Underbed Rail Kit for 2017 Ford F-250 Short Bed
    For your 2017 Ford F-250 4WD with a short bed and without the factory rail kit, I recommend looking at the Demco Hijacker Autoslide # DM8550022, along with the Underbed Rail and Installation Kit # DM8551009. This is an excellent 5th Wheel Hitch that features an 18,000 pound towing capacity and an automatic slider that will provide 14 inches of travel for making sharp turns in your short bed truck. It also has a premium wraparound, single-piece jaw for a secure connection with the trailer...
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  • Under Bed Auto Sliding Fifth Wheel Hitch Options for 2020 Ford F-250
    We do have a good mounting option to install a fifth wheel hitch in your truck bed without needing the rails that sit in the truck bed. Demco actually has an under-bed mounting kit, part # DM8551009 which would be used along with the # DM8550034 Hijacker Autoslide 18K rated hitch. When the hitch is removed, there will only be 4 holes in the truck bed, similar to the OEM puck system. To provide a 7-way tailer connector in the truck bed, you'd need the # DM8555002 wiring harness. I've...
    view full answer...
  • Wiring Harness for 2018 Chevy Silverado 2500HD with Demco Hijacker Autoslide 5th Wheel Hitch
    Demco's 21K Hijacker Autoslide 5th Wheel hitch # DM8550035 is an excellent choice for your 2018 Silverado 2500 with the OEM prep kit and it will install using matching rail kit # DM6194. For an in-bed wiring harness I recommend Demco's 5th wheel wiring kit # DM8555002 which plugs in at your factory 7-way. This harness will give you an easy to access point in the bed for connection of your 5th wheel's wiring. Please refer to the linked install video for the harness; and note that the factory...
    view full answer...

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