1. Custom Fit Vehicle Wiring
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  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # HM42635
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Custom Fit Vehicle Wiring

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HM42635 - Custom Fit Hopkins Custom Fit Vehicle Wiring
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required. Call 800-298-8924 to order Hopkins custom fit vehicle wiring part number HM42635 or order online at etrailer.com. Free expert support on all Hopkins products. Guaranteed Lowest Price and Fastest Shipping for Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (36)
  • Q & A (25)
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Hopkins Custom Fit Vehicle Wiring - HM42635

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

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing
    • Locate connection point behind driver's-side tail light
    • Plug in connector
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections
  • 90-Day limited warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side tail light. You will have to remove the tail light assembly to access this harness.


T-One Connection Location Points Behind Tail Lights

Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.



42635 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details HM42635 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - HM42635

Average Customer Rating:  4.9 out of 5 stars   (36 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting or splicing required.

- HM42635
by:

I ordered these items and I no time at all they arrived at my front door! I was able to track the items, time, place, arrival and departures. As far as the quality of the equipment, extremely well made and top notch functionality. Some of the parts were heavy, but well packaged for safety. I highly recommend this company. 904761



- HM42635
by:
2010 Jeep Wrangler Unlimited

im always shocked how fast i get my things from etrailer. got it in 2 days.. incredible. the parts are alst top of the line. 897742



- HM42635
by:

Easy to install. No problems at all. 805350



- HM42635
by:
2012 Jeep Wrangler Unlimited

Definitely happy that I was able to buy a plug in harness. Search lots of local stores but couldn't find any then Google showed me a link for the site. Shipping was quick, and pleased with the results. 795099



- HM42635
by:

Excellent! Easy to install and works perfectly. Hundreds of dollars saved instead of getting a new factory wire harness installed. 793505



- HM42635
by:

was easy to install and works fine as usual etrailer was great to work with i also instilled the plug in wiring harness DIY saved $200-400 794068



- HM42635
by:

Quick, easy, ordering and prompt delivery. Will be installing this weekend due to the fact it is snowing here in Michigan. 779414



- HM42635
by:

Knocking one star because it was a pain to get into the etrailer mount that I bought with this harness. See picture. Not sure if it was the mount or the harness being thicker. Wound up chewing the crap out of it as I pushed and struggled to get it through the hole. Not happy with it being all chewed up. The connection to the Jeep tail light (driver side) was super easy and best install in that regard I’ve ever done. 748986



- HM42635
by:

Great product and great service 722707



- HM42635
by:

Once again the product install videos were very helpful. Product installed as advertised. 719500



- HM42635
by:

Better than expected. The first installation I have ever done in my life that went exactly as it was supposed to!!! Extremely pleased! 641981



- HM42635
by:

Product arrived quickly, best price I found and was exactly what I ordered. Thank you 585497



- HM42635
by:

I think it works OK. I don't use trailer often but haven't had any problems. 575602



- HM42635
by:
2007 Jeep Wrangler

This is truly plug and play for your JK. Great Product, very easy to install. All parts are included for install. 574661



- HM42635
by:
2014 Jeep Wrangler

I haul a 4 x 8 trailer with my work van, and thought it might be convenient at times to be able to pull it with my jeep. Fast delivery, quality part, easy to follow instructions, easy to install! Thanks! 568811



- HM42635
by:
2007 Jeep Wrangler

Plug and play, how could it get any easier? Installed behind tail light in less than 10 minutes. Took another 15 to figure out a mount to make it secure. Hopkins made my life much easier with plug and play. 561473


Comments
Works every time I plug in my trailer. I keep th pigtail hidden inside my trunk so it stays clean and dry.
Nick - 09/04/2019

60753

- HM42635
by:

Product was as avertised. Easy to install . Works great 553004



- HM42635
by:

Absolutely perfect. Installation could not get any easier. Perfect solution. 524493



- HM42635
by:
2011 Jeep Wrangler Unlimited

Works very well with my 2011 Jeep Wrang ler 517095



- HM42635
by:
2012 Jeep Wrangler

Great wire harness. I’m an aircraft technician, I don’t get this kind of ease and quality in aviation lol. A person (man or woman) has plenty of time to drink a beer and still install the wire harness in under 30 minutes. 496324



- HM42635
by:
2011 Jeep Wrangler Unlimited

Easiest harness install ever, no ground wire or anything to run, 2 screws and 2 connectors then done! 493233



- HM42635
by:

Fast shipping great product 467413



- HM42635
by:

Went very well only took me about 25 minutes to install the hitch and the lights. I did not need to remove the bumper and in order to install 466466



- HM42635
by:

Very quick and easy to install! Works great! 464126



- HM42635
by:

Extremely easy install, less then 10 minutes, much aporeciated help on the phone. Second time buyer, will continue shopping with you guys. Thanks! 446806


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Show More Reviews

Ask the Experts about this Hopkins Custom Fit Vehicle Wiring

  • Recommended Trailer Wiring Harness for 2015 Honda Pilot EXL
    I do have a solution for you, however as you mentioned in your question, the Hopkins Plug-In Simple Vehicle Wiring Harness # HM42635 is designed to fit certain model year Jeep Wranglers. For your 2015 Honda Pilot EXL, I instead recommend the Tekonsha T-One Vehicle Wiring Harness # 118558. This custom harness will plug directly into factory ports behind the trim panel in the cargo area and under the vehicle on the driver side. This will provide you with a 4-Way connector that will connect...
    view full answer...
  • Adding a 7-Way Trailer Connector and Brake Controller to a 2008 Jeep Commander
    We can get you set up with a 7-Way trailer connector and a brake controller for your 2008 Jeep Commander, no problem. First, you will need to install # 118408 which will provide the light functions to the 7-Way. Once that is installed you can then install # ETBC7. This will add the 7-Way, retain a 4-Way connector as well, and include the necessary components to hardwire in a brake controller. For a controller I recommend the P2 # 90885 because it is easy to set up and use and it is reliable....
    view full answer...
  • Trailer Wiring Recommendation for 2015 Jeep Cherokee
    We have a custom fit trailer wiring harness by Hopkins that does fit your 2015 Jeep Cherokee. For that you would want the part # HM11142464. We have confirmed this as a fit with Hopkins so we know it will work well. If you have something totally different in mind send me the picture you mentioned.
    view full answer...
  • Will Hopkins Plug-In Trailer Wiring Harness Fit a 2019 Jeep Wrangler
    The Hopkins Plug-In Simple Vehicle Wiring Harness # HM42635 that you referenced is a fit for 2007 - 2014 Jeep Wranglers so for your 2019 Wrangler you will want the Tekonsha T-One # 118786 instead. Hopkins currently doesn't have a wiring option for you (as of May 2019) and we have found the Tekonsha wiring to be the most reliable on the market. The T-One has the same type of plug-in connectors as the Hopkins that you referenced but it also has a hot lead that you route up to your battery...
    view full answer...
  • Recommended Hopkins Wiring Harness for 2012 Jeep Liberty
    I do have a solution for you, however the Hopkins Plug-In Simple Vehicle Wiring Harness # HM42635 referenced in your question is designed to work on certain model year Jeep Wranglers and will not fit your Jeep Liberty. For your 2012 Jeep Liberty, you will instead want the Hopkins # HM11142485. This custom harness is confirmed to fit your vehicle and will install by connecting to the built-in ports located behind the driver and passenger side tail lights. Once those connections are made,...
    view full answer...
  • Parts Needed to Install the Prodigy P2 # 90885 on a 2014 Jeep Wrangler w/o the Tow Package
    If you don't have the tow package on your 2014 Jeep Wrangler then the Hopkins part # HM42635 is a good start but that is not all you will need for your Prodigy P2 # 90885 to properly work in your Jeep. The Hopkins kit that you referenced will give you a 4-Way connector but you need a 7-Way connector. For that you need the Universal Wiring Kit # ETBC7. This includes everything needed to have a fully functional 7-Way on your Jeep. This will also allow you to use your P2 for towing your...
    view full answer...
  • Trailer Lights Wiring Harness 2014 Jeep Wrangler Unlimited with 5 Poles
    My advise is based on the assumption that your trailer with a 5-wire connector is a boat trailer and the extra wire is blue and locks out the trailer brakes when you are in reverse. The easiest way to determine if your 2014 Jeep Wrangler Unlimited has factory tow set up is to have the dealership run the VIN for you and let you know how it was equipped. The tow package would have at least included the tow hitch and tow wiring. It seems unlikely that someone took the hitch off of your...
    view full answer...
  • Will the Hopkins # HM42635 Fit a 1995 Jeep Cherokee
    We do have an option for you to add a 4-Way flat wiring connector to your 1995 Jeep Cherokee, but the Hopkins # HM42635 that you referenced is not confirmed to fit. What you will want to use instead is the Tekonsha # 119178KIT which is a hardwire installation that uses quick-splices to make it easier. Installation instructions have been attached for you to reference. If you will be towing with your Cherokee but do not already have a trailer hitch then I recommend part # 75054 which...
    view full answer...
  • Recommended Trailer Wiring Harness for a 2017 Jeep Wrangler Willys Wheeler Limited Edition
    We do have trailer wiring to fit your 2017 2-door Jeep Wrangler Willys but the Hopkins, part # HM42635, you asked about is not a fit. It's for model years from 2007 to 2014. If your Jeep doesn't include the tow package I recommend the Tekonsha, part # 118416. It plugs in behind the driver's side tail light. If you do have the tow package instead use part # HM42190. See the picture I've attached. If you have this connector under the rear of your Jeep then you have the factory tow package.
    view full answer...
  • Hopkins Trailer Wiring Harness for a 2003 Jeep Liberty
    We do have a Hopkins trailer wiring harness that fits the 2003 Jeep Liberty but the part you looked at, part # HM42635, fit Wranglers from 2007 to 2014. Instead you need part # 42475 for your Liberty
    view full answer...
  • Wiring Harness for 2012 Jeep Wrangler Without Tow Package
    The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM42635 is the correct wiring harness for your 2012 Jeep Wrangler that does not have the factory tow package. It will give you a 4-flat in order to power your trailer's lights. I've added a link to a video review of this part for you to take a look at.
    view full answer...
  • Hopkins Trailer Wiring Harness for a 2013 2-Door Jeep Wrangler
    The Hopkins trailer wiring harness, part # HM42635, does fit your 2-door 2013 Jeep Wrangler as long as you don't have the factory tow package. If you do have the tow package instead use part # HM40975-11933.
    view full answer...
  • Will Hopkins Wiring Harness # HM42635 Fit 2010 Jeep Wrangler
    Yes, the Hopkins Plug-In Simple Vehicle Wiring Harness # HM42635 referenced in your question is confirmed to fit your 2010 Jeep Wrangler that does not have the factory tow package. This custom-fit harness will install by connecting directly to the built-in ports located behind the driver's side tail lights. This will provide you with a 4-Way connector at the rear of your Jeep to connect with and power a trailer's basic signal lights. I have attached the installation instructions that...
    view full answer...
  • Will Hopkins Item # HM42635 Work For 2004 Jeep Wrangler
    The Hopkins Plug-In Harness, Item # HM42635, is not a confirmed fit for your 2004 Jeep Wrangler. What does fit is the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, Item # 118409. The Tekonsha wiring harness is a quick and easy install that plugs directly into your existing wiring. It will provide you with a 4-way flat trailer connector for your Jeep. It is also compatible with 5-pole, 6-pole, and 7-pole adapters which are sold separately. I have attached...
    view full answer...
  • Recommended Wiring Connector for 5-Way Boat Trailer Connection with 2009 Jeep Wrangler Unlimited
    We do not carry a 5-pole wiring harness that is vehicle specific. For your 2009 Jeep Wrangler Unlimited, you can install the 4-way # HM42635 and then splice in the vehicle side 5-way flat # HM47900 using butt connectors like # DW05744-5 to give you the 5 way. This will give you the connection without the adapter # 47515 needed each time as a 5-way will still work with a 4-way connection without issue and be a better connection for your boat trailer's 5-way. Your other option is to...
    view full answer...
  • Hitch, Wiring and Other Towing Items Needed for 2010 Jeep Wrangler
    We can help you get your 2010 Wrangler set with a hitch, wiring and other items for towing. The hitches made for your Jeep are intended for models with the standard rear bumper. You can see them all on the linked page, but the one I recommend is the highest-capacity model # 76104 which is rated for 675-lbs tongue weight and 4500-lbs towing. I linked an installation video to show you how it installs and a helpful article is included too. The hitch comes with the hardware you'll use to...
    view full answer...
  • Trailer Wiring Recommendation for 2010 Jeep Liberty Sport
    I have a trailer wiring harness that would work well on your 2010 Jeep Liberty, but the part # HM42635 is only a fit for Wranglers. Instead you would want the part # 118554 which is a confirmed fit. I attached an install video for this for you to check out as well.
    view full answer...
  • Trailer Hitch and Wiring for a 2013 Jeep Wrangler Unlimited
    I recommend going with the Draw-Tite Max-Frame Trailer Hitch Receiver # 76104 for a trailer hitch on your 2013 Jeep Wrangler Unlimited. This trailer hitch is a Class III hitch with a 2" receiver like what you are needing. It installs on a standard rear bumper and has a Gross Towing Weight (GTW) of 4,500 lbs and a Tongue Weight (TW) of 675 lbs. Be sure to check your owner's manual to make sure you can safely reach those weight capacities. For wiring I recommend the Hopkins part #...
    view full answer...
  • Installing 4-Way Trailer Connector in 1987 Jeep Wrangler
    The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM42635 is only a fit for 2007 to 2014 model of Jeep Wrangler and Wrangler Unlimited. For your 1987 Wrangler, I recommend the Tekonsha 4-Pole Hardwire Kit with Circuit Tester # 18252. This will be an easy install with the circuit tester and quick splice connectors to give you a working 4-way trailer connection. Your 1987 Jeep Wrangler did not have the factory wiring connection points to utilize, but...
    view full answer...
  • Troubleshooting Correct Wiring Harness for 2007 Jeep Wrangler Unlimited
    I do have some ideas and hopefully can help, though I'm a little confused by the question, only because the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56003 you are asking about is not a fit for a 2007 Jeep Wrangler Unlimited, and you also said that it works fine when you are towing but the tow connection does not work. If you do not have the right wiring harness, that may be the issue, as you will need the Hopkins Plug-In Simple Vehicle Wiring Harness # HM42635 if your...
    view full answer...
  • Comparing Trailer Wiring Harnesses For 2011 Jeep Wrangler Unlimited
    The # C55124 and # HM42635 trailer wiring harnesses we offer for your 2011 Jeep Wrangler Unlimited are installed the same way on your vehicle. Both provide you with the tail, turn, and brake light. The Curt harness has a 1-year warranty while the Hopkins wiring harness has a 90-day warranty. The harnesses plug into the vehicle wiring located behind the tail lights To install these harnesses you will need to remove the tail light assembly to get to the wiring. When working with electrical...
    view full answer...
  • Best Flat Tow Wiring for a 2011 Jeep Wrangler
    We do have the wiring you need to activate your 2011 Jeep Wrangler lights while it is being flat towed but the Hopkins part # HM42635 that you referenced is used when towing a trailer with your Jeep. You will need a different system for flat towing. I recommend using the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267. This is one of our most popular kits because it uses a 7-Way on the RV side of the coiled wire which is typically what you see at the back of an RV....
    view full answer...
  • Will Prodigy P3 Brake Controller Fit 2009 Jeep Wrangler JK Without Towing Package
    Yes, the Tekonsha Prodigy P3 Trailer Brake Controller # 90195 will absolutely fit your 2009 Jeep Wranlger JK without a factory connector (towing package). To install it you will need to start with a 4-way, if you do not already have one, the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM42635. You will then need the Universal Installation Kit for Trailer Brake Controller # ETBC7, which will give you a 7-way connector, circuit breakers and the rest...
    view full answer...
  • Ready to Tow Setup For 2009 Jeep Wrangler Unlimited
    To be able to tow the trailer with a 7-way connector you are right that you will need to install a 4-way connector first if your 2009 Jeep Wrangler Unlimited does not come with a factory tow package. The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM42635 will plug into your factory harness in your Jeep without factory tow package. The Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat # C57672 will be able to plug into your newly...
    view full answer...
  • Comparing the Hopkins Flat-Tow and Trailer Wiring Harness for a 2013 Jeep JLU
    The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56200 is designed to take an input signal from the motorhome and apply that signal to the vehicle's taillights. The towed vehicle does not have to be running for this signal to be active. The Hopkins Plug-In Simple Vehicle Wiring Harness part # HM42635 on the other hand is designed to take an input from the vehicle and apply that signal to the trailer's taillights. The tow vehicle does need to be running for these signals...
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Installed by:
Cole B
Video Edited:
Chris R
Written by:
Alexander C

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