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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 # 31345
Our Price: $68.35
You Save: 40%
Custom Fit Vehicle Wiring

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Hopkins 4 Flat Custom Fit Vehicle Wiring - 31345
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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. Powered converter reduces strain on wiring system. 1-636-306-4830 to order Hopkins custom fit vehicle wiring part number 31345 or order online at Free expert support on all Hopkins products. Great prices 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.
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  • Reviews (64)
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  • Why etrailer?

Hopkins Custom Fit Vehicle Wiring - 31345

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Hopkins

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system.


  • 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
    • Locate connection points in rear cargo area
    • Plug in connector
    • Run hot lead to car battery
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Protective connection terminals resist corrosion
  • Comes with dust cap for 4-way flat connector, cable ties, and terminal grease packet for electrical connections


  • Maximum amperage:
    • Turn lights: 8 amps per circuit
  • 90-Day limited warranty


This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in your rear cargo area, on the driver's side and passenger's side. Once you've plugged in the connector, run the red hot lead up to your car battery. Connect the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.

Once installation is complete, the 4-way connector will be stowed in your rear cargo area.

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.

Powered Tail Light Converter

A tail light converter is built into this T-connector. This converter is a battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

41345 Plug-in Simple Hopkins T-Connector with 4-Pole Trailer Connector

Installation Details 31345 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 31345

Average Customer Rating:  4.5 out of 5 stars   (64 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. Powered converter reduces strain on wiring system.


Doesn't work. What is wrong with providing actual wiring harnesses for vehicles. I took the the harness provided out tossed it in a box and there it lays.

Would you be able to provide some more detail as to how this isnt working for you?
-- Etrailer Expert Brooke M - 08/09/2022

2012 Chevrolet Express Van

This wiring harness was awesome to install. it fit my van perfectly and went together without any problems. I watched the install video and it showed how to route the wiring and that you would need to add wire to part of the harness. I didn't like the way they ran the wiring in the video, so I did it my own way. The outcome was clean and I didn't need to add any wire. Everything reached where it needed to go just fine. Tested the harness and all works great. Thank You for the great product!

Still using this harness every day. it has held up very well
Thomas B - 04/25/2022


Slick product!


Trailer light kit was a Perfect fit, and the lights work more brightly than just tapping into existing lines. Safer to my system too! The You Tube install video was a big help

Still works perfectly, and etrailer has thoughtful customer service
John C - 06/24/2021


Not enough wire otherwise it works


Amazing product. Exactly designed for the van and super straight ahead to install

2010 Chevrolet Express Van

Wires are too short. The length of the 4-wire plug to the trailer is at least 14" too short to reach the center of the hitch and you're limited by the plug into the driver's side taillight connection. The main power lead was about 4' short by my routing through the inside of the van, it probably needs about 6' of additional length to make sure it fits everyone. It took me a couple hours to go get longer wires and solder the connections in place to make this work.

2019 Chevrolet Express Van

Watching the video of how to install the kit gave me the confidence to buy the kit. I was at a total loss not being able to find the trailer harness in my new van. The video showed that the van does not have any trailer harness and it needed to be installed. I also like that it showed two kits. I needed the kit with added power for sure. We have a camper. Thanks for showing me the way Etrailer.

2014 Chevrolet Express Van

Overall a great kit, but a couple issues that if corrected, would make it near perfect. The first issue is the area of the mounting bracket for the 4-pole connecter. It is open on one side so that the connector slides in easily... which means it also slides out easily. The bracket needs a redesign to hold the 4-pole more securely. The other issue is the hole on the large ring connectors is too small. I have the extended post battery connectors suggested in the install videos, but the large ring connectors do not fit over the post. I used a step drill bit to open them up a bit so that they would fit, but the large ring connectors in the kit should be changed for ones that are slightly larger to fit the battery posts. Aside from those issues, it's a great kit!

2015 Ram 3500

Vehicle: 2015 Chevy Express 3500 Extended Wheelbase Passenger (15-pass)

1 star off for having two wires too short for the extended wheelbase, and the size of the converter that makes placement a little more awkward in the passenger trim than it probably needs to be.


Harnesses fit perfectly, plenty of wire for the passenger-side connector to the box. I was able to route it around without issue.

There really isn't a good place to mount the box in the passenger van, as the rear HVAC blower is right next to the back corner and the speaker and the wiring for passenger features use most of the factory openings/holes that are shown in the install video. A two-sided sticky pad (3M adhesive pad) would help in this.

Same goes for the gasket to route the 4-pin connector. The install video shows a cargo trim with no wiring into the back driver's side door. In the passenger trim that I have (rear window defogger, interior light switch, etc), the rear door wiring already occupies that hole and is a single piece that is the gasket and tubing to the rear door. The 4-pin can fit along with that, but you have to slit along the tubing portion to allow the 4-pin to exit.

The connectors for the tail lights don't include a second locking tab, which makes that connection not as robust as the factory connection. Use a zip tie in place of the locking connector.

You need more zip-ties than are included. I used about 30, most were for the power wire, but I used two large ones to mount the box. Again, a double-sided adhesive patch like 3M makes would have made this a lot simpler.

The wire for the power is at least six feet too short for the extended wheelbase, at least for how I could run it. I followed the routing in the video that goes with the factory wiring - I ran it out with the 4-pin and then followed the factory wiring for the backup sensor. It ends right in front of the driver's seat. I suppose if you were to remove all inside panels and run it in the wall, you might have enough, but I doubt it. The instructions say to avoid heat and moving parts. The best way I found was to use one of the two gaskets right in front of the driver's seat. One is for the parking brake (rectangular), and the other is round. Don't know what it's for. Then you go under the carpet and end up right next to a gasket in the firewall. Punch through that (sealing it up afterward of course), and you're really close to the fuse box.


The length from the converter to the 4-pin connector is way too short. It ends up on the side of the vehicle still. Another two to three feet would be ideal to get it to the middle of the underside where the wiring from the trailer would be.

The pigtail with the fuse is also a little short. In my vehicle (I imagine that most late-model GM vans are similar), there are several hoses and tubes for A/C and such right above the fuse box where this is supposed to be connected. If the engine is warm, those hoses and tubes are HOT. I would prefer a longer pigtail wire with the fuse further away so it can be placed away from the hot hoses and tubes for when the fuse needs to be checked/replaced. Ideally, the pigtail would be long enough to put the fuse in the passenger compartment near the pedals. Note to GM: maybe you should make more of the fuses more accessible when the engine is hot.

Other thoughts:

There should really be a 5-pin version of this that includes the backup lights. The GM wiring harness for the tail lights also includes the backup lights, and the harness in this kit passes that through. It would be so easy to just patch into that feed like for the tail/turn lights and pass it into the converter box to facilitate the wiring of a 5-pin or 7-pin/blade trailer wiring. In fact, I'm kinda surprised that something like this doesn't exist as a 7-pin/blade kit. With the backup lights as part of this box, you only need brake and aux power. The aux power could also be part of the converter as well (use 10 awg from engine compartment electrical), and add a brake wire, and that's it.

2012 Chevrolet Express Van

Installed in 2012 Chevy Express 3500 van.

plugs were an exact fit.

The green wire that runs between the two sides of the vehicle was just long enough, but I would have preferred another foot longer.

The wire on the 4 blade connector was NOT long enough. I was only about half the length required.

The red 10 gauge power wire that comes with the kit will probably work for most trucks, however it was not long enough for my van.

You only get a 4 blade connector. You still need to find and splice into the reverse wire if you are trying to install a more complicated connector. The reverse wire is also needed for a backup camera.

I ended up running a 8 gauge stranded wire from under my hood to the back. I then installed a small power block that I got from Home Depot. From there I ran power to the 4 blade box you see in the picture and also ran power to the hitch connector that I ended up using.

The easiest way to install is to not drill anything and simply run the wires up the inside of the door hinge to the pre-drilled hole covered by the black plastic pop-in cover. I looked for better options and ways I could hide the wires, no easy way to do this even if you drill through the floor pan.

2006 GMC Savana Van

Made installing trailer wiring very easy on my cargo van which had no factory trailer harness. Plugs-into factory light harness. Connect to the existing ground and run a power wire and it's done.
Note: Plan the run for the 4-wire connector and make sure it will reach. I used a factory hole in the left rear door hinge post with a grommet. Just remove the factory 1.25" plastic caplug and carefully push the 4-wire connector through the hole. It is tight, but will fit without re-drilling the hole.


I put this wiring harness into my 2006 GMC Savana (with extended wheel base). Every component was well made. It was simple to install. (The videos are wonderful.) It has performed flawlessly since then.

2012 Chevy Express

Product was exactly as described. I installed this on a 2012 Express 12 passenger van. Although the installation video was for the cargo van, it was extremely helpful. For the passenger van you will need to remove 5 panels, and the rear speaker housing (if you choose to follow the factory wiring). It is easily done and does not require any special tools. The OEM connectors were an exact fit, the wiring bundle to the 4-pole connector could have been about 6" longer and the ground wire could have been about 12" shorter (I cut the ground and crimped a terminal ring), but it did do the job. Total installation time for me was about 90 minutes. overall great product.


If you need this thing then you are already unhappy because your vehicle wasn't pre-wired for the trailer connection. This adapter makes it reasonably easy to do the wiring, and also by bringing a battery feed wire to this, it doesn't put any significant additional load on the existing wiring, which could be problematic on new vehicles.

2015 Chevrolet Express Van

Went together well. You could have added 6 more inches to the 4 way pigtail as I was adding a 7 way to the end of it. I had to mount 2 or 3 inches to the left of where I really would have liked it. Also the red wire to the engine compartment was too short because I have an extented van. I had to splice a peice onto the wire supplied.
You should supply enough wire to satisfy both wheelbase lengths. Overall happy...happy that it's done

2004 Chevrolet Express Van

The installation videos were worth their weight in gold, and the actual installation was nearly as easy as the professionals made it seem. I installed mine on a 2004 Chevy Express, and every part fit exactly as described except the zip ties. They were to small to be of any use, and when I tied two of them together to make a longer tie, they snapped under the slightest tension. Over all, it wasn’t a serious setback, they are cheep, and I just used some I had in hand. The included wire designed to run to the battery was about 10 feet too short for my project, but I was installing it on a 15 passenger vehicle. Anything shorter, and the kit would have been perfect as is. Again though, the wire was fairly inexpensive, and available at any auto parts store. All said, generally a good kit that worked well for me.

2014 Chevrolet Express Van

Wiring harness works great. Everything went together well. Etrailer's customer service is terrific.


Works like it's supposed too but the harness for the trailer lights was too short.

2010 Chevrolet Express Van

The instructions were easy to follow. I wish I had known about the battery terminal adapter--it would have saved me alot of frustration. My fault for not watching the installation video first. Overall, very happy with how easy it was to connect the connectors to the taillight plugs in the back of the van.


Great communication. An excellent compa ny.

Absolutely great!
linda k - 09/20/2021


The wire on the 4 way plug is way to short as reviewed by a lot of other customers. It should be about 3-4' longer.


This pigtail made my life alot easier. I was dealing with a local installation my uncle had done before I inherited his van. I couldn't get anything to work correctly. So when I came across this part I was totally ready to start over. I love nothing more than a clean installation and this pa rt t made it fool proof. Whoever sat down and made this is a hero.


This kit made installing the wiring much easier. Beware of tying trailer lights into a computer controlled vehicle without this kit.

2017 Chevrolet Express Van

surprise the wiring was shipped with hi tch

Show More Reviews

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

  • Why Is Powered Module Or Powered Converter Important When Installing Trailer Wiring
    The powered module or powered converter on a product such as # 31345 is very important to the life of your product, because it reduces strain on the wiring and it helps avoid overloading your Chevrolet Express Van's electrical system. Buying a product with a modulate will enable you to depend on this product and vehicle longer. Not having one will increase the likelihood of more strain on the vehicle and the product.
    view full answer...
  • Installation of Wiring Harness on a 2006 Chevrolet Express Van
    Yes, the Plug-N-Tow (TM) Vehicle Wiring Harness, item # 31345, will plug inline with the taillight wiring behind the taillights of your Chevy Express. You will have to route one wire forward, either along the vehicle frame underneath or along the interior and out through the firewall, to the vehicle positive battery post through an inline fuse. Usually you can find a grommet to run the power wire and trailer connector wire to the outside of the vehicle if you like. When running the wires...
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  • How to Install the Hopkins Custom Fit Vehicle Wiring for a 2006 Chevy Express Cutaway Van
    The Hopkins Custom Fit Vehicle Wiring, # 31345, that you reference is the correct custom wiring for your 2006 Chevy Express Van. This unit contains a powered converter that has a direct connection to the battery so the harness does not draw all its power from your vehicle taillight wiring which will save your lights from failure. To install, first find a suitable place to mount the converter. The best place is probably near the left taillight. Attach the white ground wire on the unit to...
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  • Trailer Lights Do Not Work After Installing Trailer Wiring on a 2010 Chevy Express 3500 Van
    I an 99 percent certain that it is a ground problem. The circuit cannot be completed unless everything is properly grounded including the trailer connectors, the converter box, and all of the lights. Grounds should be attached to clean and corrosion free bare metal surfaces. I have included a link to our wiring FAQ for reference.
    view full answer...
  • What Is Purpose of Converter on Hopkins Wiring Harness # 31345 For 2003 Chevrolet Express
    On the Hopkins Plug-N-Tow Wiring Harness, part # 31345, for the 2003 Chevrolet Express, the powered converter is used to supply the power to the trailer lights by being connected directly to the vehicles battery. When drawing the power directly from the battery the converter is bypassing any expensive electrical components that are in your vehicles electrical system. This prevents any damage to those components that could happen if the power was run through your vehicles electrical system. The...
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  • If Converter Box of Trailer Wiring 31345 Fails Does All of the Trailer Wiring Stop Working
    If the converter box of the # 31345 fails most likely all of the pins, or some of the pins, will have voltage on them at all times rendering the trailer wiring useless. If the box fails the entire trailer wiring setup stops working.
    view full answer...
  • How to Test Trailer Wiring Harness with Parking Lights Always On on a 2006 Chevy Express Van
    It sounds as if your converter is shorted out. To check, you can test the brown wire going into the converter, no trailer connected, with a circuit tester, # 40376 if needed. You should not have power with the tail lights off. Then check the brown wire coming out of the converter, if you have power with the tail lights off then the converter has been shorted somehow and will need to be replaced. If the wiring harness functions normally with no trailer connected, then there is a problem...
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  • Wiring Harness Recommendation for 2003 Chevrolet Express Cargo Van
    Yes, the Plug-N-Tow Vehicle Wiring Harness, # 31345, can be installed on your 2003 Chevrolet Express Cargo Van. The powered converter on this wiring harness gets the signals from the vehicle wiring system but draws the power to illuminate the lights on the trailer directly from the vehicle battery. I have included a link to our installation video that you may want to check out. Another option would be the T-One Vehicle Wiring Harness, # 118392. This wiring harness simply plugs into your...
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  • Wiring Harness Options and Installation on a 2003 Chevrolet Express Van
    There are two trailer wiring harnesses available for your 2003 Chevrolet Express Van if it does not have a factory installed wiring harness. The Hopkins Plug-N-Tow Wiring Harness, # 31345, that you referenced does require the red wire from the input side of the converter box to be ran to the vehicle battery using the included extension wire and inline fuse to work (see photo). The power wire provides power to the converter box which powers the trailer lights. I have provided a link to an...
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    Image 1 for
  • Trailer Wiring Recommendation for a 2008 Chevy Express Van
    Both the trailer wiring harnesses you referenced have been confirmed as fits for your 2008 Chevy Express Van. Either would work well but they have their pros and cons. The # 118392 will install much easier but will not have the circuit protection. In the event of a trailer wiring short you may end up popping fuses in your vehicle or damaging the circuits. The # 31345 will be a bit more difficult to install, but it will offer some peace of mind as trailer wiring shorts won't damage the...
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  • Trailer Wiring Recommendation for a 2008 Chevy Express Van
    Both the trailer wiring harnesses # 31345 and the # 55540 that you referenced have been confirmed to fit your 2008 Chevy Express Van. Both have their pros and cons. The # 31345 only uses the taillight circuits of your vehicle as signal wires and draws all of the power to illuminate your trailer taillights from the vehicle battery. This is a better setup overall that will reduce the risk of over drawing your vehicle's taillight circuits at the cost of a more in-depth install and a little...
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  • Is the JR Products Propane with 3/8" Female SAE Swivel a Type III
    The Propane Hose - 3/8" Female SAE Swivel x 3/8" Female SAE Swivel - 5', # 37207-31345 is UL and CSA approved and is a Type 1 hose.
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  • Troubleshooting Power to Both Running Lights and Left Turn Circuit After Converting 4-Way to 7-Way
    The Hopkins Plug-In Simple Vehicle Wiring Harness # 31345 that you installed is a confirmed fit for your 2017 Chevy Express Van so we can rule the harness out as the problem. It sounds like you extended the wiring from the 4-Way harness to a 7-Way like the Hopkins # HM48470 that features a 4- and 5-Way connector as well. I recommend making sure that the connections inside the 7-Way match the appropriate functions. It's also possible that there is a short between the running lights circuit...
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    Image 1 for
  • Is Non-Powered 4-Pole Wiring Harness Safe for Use in 2008 Chevy Express 3500 15-Passenger Van
    For the 2008 Chevy Express 3500 15-passenger van we do have non-powered 4-pole harnesses # 118392 and # 55540 that are intended to add trailer wiring for vans without the tow package. These simply plug in at the two tail light assemblies to get the necessary lighting signals for the trailer and that lighting power is then drawn through the van's own internal wiring. We also have a powered converter harness # 31345 that uses a separate 12V power connection to the van battery. This provides...
    view full answer...
  • Installed Hopkins Custom Fit Vehicle Wiring Harness, # 31345, On 2005 Chevy Express, No Brake Lights
    You might have a weak ground problem that is causing the brake lights not to work. The three areas where you will want to check to make sure you are getting a good ground is the ground wire from the converter in the wiring harness, the ground wire of the connector on the trailer and the trailer lights are grounded to the trailer. First, you will want to check the white wire on your wiring harness that is coming out of the converter. You want to make sure it is attached to a good, clean...
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  • Trailer Wiring Harness on a 2011 Chevrolet Express Van Cutaway Model
    A standard Chevy Express van using a combined wiring system so the turn and brake signals are on the same circuits. So a wiring harness like the Hopkins, part # 31345, plugs right in and will work fine. However, it sounds like your 2011 Cutaway model has a separate wiring system. In this case the only type of wiring harness I can guarentee a fit for is a universal part like # 119190KIT.
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  • 4-Pole And 7-Way Trailer Connectors For A 2006 Chevrolet Express Van 3500
    Sure you can use the Hopkins Plug-In Simple Vehicle Wiring Harness With 4-Pole Wiring Connector # 31345, however I recommend also installing the Universal Installation Kit For Trailer Brake Controller # ETBC7. This kit will utilize the existing 4-pole connector, and also provide your 2006 Chevrolet Express Van with the capabilities of a 7-way. Leaving out the other wires is going to limit the type of trailers you can tow, which is why I recommend installing # ETBC7 as well. I have also...
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  • Trailer Wiring Harness Adapter for a 2014 Chevrolet Express Van
    The 2014 Chevrolet Express Van if equipped with the factory tow package would have come with a US-Car connector which you can see in the attached video at about the 1:30 mark. In order to use this US-Car connector you will need an adapter to go from this to the end of the bumper, the Hopkins Plug-In Simple Wiring Harness part # 41155 for a 4-way or the 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket part # HM40975 for a 7-way. The 2014 Chevrolet Express Van if not equipped...
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  • Trailer Wiring Options for a 2008 Chevy Cutaway Van with a Fiberglass Unicell Box
    The Hopkins # 31345 lighting kit is the correct part for your 2008 Chevy Express Van. You can have the wiring from the box to the 4-Way under your frame but the powered module does need to be mounted in a weatherproof location. Another option for you is the T-One # 118392 which doesn't use a powered module at all. The advantage of this is that you don't have to worry about where to mount the module but the disadvantage is that you don't get the protection to your vehicle wiring like you...
    view full answer...
  • Universal Wiring with Powered Module for 2008 Chevy Express 3500 Cutaway Van
    If you are looking for a wiring kit like the Hopkins # 31345 but that uses universal wiring as opposed to the connectors that tee in behind the tail lights on a 2008 Chevy Express Van then you will still need to use the Hopkins wiring kit as there are not any without the quick and speedy connection. However, you can just snip those connectors off and splice your connections This kit calls for splicing to your tail light wires whether it is with butt connectors or the included quick splices,...
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  • How To Install Both 4 and 7-Way Trailer Connectors On a 2019 Chevy Express Van
    In order to install both a 4 and 7-way trailer wiring harness on a 2019 Chevrolet Express Van I recommend starting with the Hopkins Plug-In Simple Vehicle Wiring Harness part # 31345 which is plug-in-play. Then, you can convert this to a 7-way with 4-way using the Adapter 4-Pole to 7-Pole and 4-Pole part # 37185. Once you also get the Curt No-Drill Bracket part # C57202 you'll have everything.
    view full answer...
  • Adding a Trailer Wiring to the 2019 Chevrolet Express Van
    I cannot confirm what the harness you have pictured is for. However, it is not a trailer wiring harness. If you'd like to add a 4-way to your 2019 Chevrolet Express Van (assuming you don't have the factory tow package, of course), then you can use the Hopkins Plug-In Simple Harness, part # 31345, that you referenced. I've linked to a video installation of this kit for you to reference. It will connect to the plugs on the driver and passenger sides in the rear of the van. After you've...
    view full answer...
    Image 1 for
  • Is there a Brake Controller Wiring Harness Located Under the Dashboard On a 2008 Chevrolet RV
    Normally for RV applications there is not a wire bundle located under the dash of the vehicle for brake controller installation. If your RV came with a factory 7-Way at the rear of the vehicle then the Blue wire for the brake feed may be ran and located under the dash to the left of the steering column. You will need to hard wire your brake controller to the stoplight switch, battery, ground and trailer brakes. You will need to use a Circuit tester, part # 40376 if you need one, to determine...
    view full answer...
  • Installing Hopkins Plug-In Wiring Harness On 2009 Chevrolet Express Van
    When you are going to test all the functions you will need the motor running so you can make sure everything is installed properly. There is only one ground wire needed when installing this harness. The ground wire you found should have a ring terminal on it and it provides the ground for the converter so that is all you need. I have attached a drawing that shows how the wiring needs to be run when installing the # ETBC7 and a Brake Controller like part # 90195.
    view full answer...
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