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6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends)

6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends)

Item # 37995
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Hopkins Trailer Wiring - 37995
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Lowest Prices for the best trailer wiring from Hopkins. 6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends) part number 37995 can be ordered online at or call 1-800-940-8924 for expert service.
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Hopkins Trailer Wiring - 37995

  • Wiring Adapters
  • Single-Function Adapter
  • 6 Square
  • Plug and Lead
  • 0 - 5 Feet Long
  • 6 Square
  • Hopkins

6-Pole square trailer wiring connector kit

  • Square design 6-pole
  • Includes both male and female ends for car and trailer
    • Wire leads on each trailer and vehicle end measures 11-3/4"
    • Pigtail wires are 18 gauge

TAP # 37995 / Hopkins # 47995

47995 6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends)

California residents: click here

Video of 6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends)

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Wiring - Wiring Adapters - 37995 Review

Today we're going to review part number 37995, this is the Hopkins 6-Pole Square Trailer Wiring Connector Kit. You can see it has the square design 6-Pole on both connectors. It includes the male end, the male end is what would go on the trailer and includes the female end, 6-square end, which will go on to the vehicle. Basically the pigtail wires on each, they use an 18 gauge size wire. The length, give you an idea of the length on these, got a 12 inch ruler and basically you can see that you're about 12 inches in length on each one. Now basically what you would do is this one here, with the female end, this would connect to the vehicle, the tow vehicle, so you'd wire this in with the pigtail wires. This end, with the male ends, would go to the trailer, and again you'd wire those in.

Then basically all you would have to do is push that together, just like that, and you would have the six way connector. That should do it for the review on part number 37995, the Hopkins 6-Pole Square Trailer Wiring Connector Kit. .

Customer Reviews

6-Pole Square Trailer Wiring Connector Kit (Car and Trailer Ends) - 37995

Average Customer Rating:  4.8 out of 5 stars   (143 Customer Reviews)


This is a product that I needed for my project, but was not easily found and available. not only had the product, but had it at a great price. Shipping was very fast and free for the amount I ordered. Overall, this was a great shopping experience. I made a bulk order of 16 as I am manufacturing trailers that are towed behind motorcycles. This product gives me the six conductors that I need in a very small package, which is great due to the size of motorcycles compared to cars or trucks. The only thing that could be improved with this product would be if they came with dust caps for each connector, or at least one for the vehicle side to prevent dust and moisture intrusion while the trailer is not in use. Keep up the excellent service and selection.


I had lost the the connector to my pop up trailer. It is a square fitting. I looked everywhere and only found one and they wanted $45.00. Everyone uses flat fittings now. Then I found etrailer just $ 14.00 and that included shipping.


Bullet-proof connector, if not the most elegant.

Used in my case for custom "adventurization" wiring on my 2007 BMW F800ST motorcycle, now just road tested this late summer - early fall 2017 on a three month, 18,000 mile loop out of Chicago through the Arctic & Pacific Northwest, including the Dempster & Dalton Highways.

Had a custom wiring harness that had to be able to be removed in order to get at the engine, hence the need for the connectors.

A few photos should be attached.


It fit the trailer harnes great a little tight but it won't come off . It took a while to. figure out the bike


6 pin trailer harness is constructed with optimum gauge wiring. Length is excellent for installation on the GL1800. This product was installed on GL1500 and matching trailer. Tight snug connector fit, insures water-tight connection. A+


I needed to add a more convenient location to plug and unplug my backup camera on my 2015 Chevy. The camera harness was a 6-wire harness and this 6-way plug was just what I needed. Works perfectly.


worked great, as expected


Part came in as described. Was a perfect fit for my needs. Has worked very well. One small problem which we overcame is that the connector is very hard to totally connect and even harder to disconnect when the winter is over. The use of channel lock pliers took care of the problem. Being hard made them more water resistant which was a plus.


Extremely fast shipping,, was in my hands in two days,,, fantastic.

continues to work great. etrailer usually always has what you need to get the job done.
Randel - 07/13/2021


VERY fast shipping, which we were very grateful for. The product worked very well for our purpose. Would recommend your company to anyone that needed trailer accessories.


Good product


Good quality connector. Directly compatible with my Jayco trailer. etrailer delivered promptly.


Easy transaction, very good price, extremely fast shipping. A pleasure to do business with.


I have a Coleman popup trailer w/ a 6-wire harness (no brakes). After receiving the Hopkins 6-wire plugs from eTrailer, I was able to create a conversion cable to "jump" my 4-wire tow vehicle plug lead to the 6-wire trailer plug. It works very well and I will be ordering other items from eTrailer.

Product works well and was just what was needed
Tom N - 12/08/2017


This product replaces several of types of connectors, e.g., cinch-jones and other 6 wire types. It will be used to connect model railroad show modules. I was looking for a reasonably rapid insertion and disconnect and good conductivity. Power is low power DC, so the wire is more than adequate. I also needed a reasonable drop so as not to strain the terminal strip (barrier) connection. These, I believe, will work well. I hope this helps.

The connector sets I purchased are for inter modular connection on a mobile model railroad. They are working very well. I would hope you might make a connector with more pins, e.g., 8 or possibly 10. I realize the trailer application requires only 6, but the ledger ones might find other applications.
Richard B - 08/13/2014


The product showed up at my door fast. It was exactly what I needed, and it's worked well for me. Very happy with the service I've gotten.

Its worked well for me.
Daniel H - 04/18/2021


Although I am not intending to use this harness in a trailer setup, it will serve my purpose for attaching / detaching a rotor, and controller, at the base of an antenna and inside the home. Thanks for a great product!


works as stated

Still good
bruce - 09/27/2021


Did not use this as a trailer connector. I had to have a way to plug and unplug another device. This worked perfectly. The wires were long enough to stagger the splices and allow for a smaller diameter splice. Overall an excellent product.

The device I used this on is now installed permanently and no longer need to plug and unplug for relocation., The connector worked perfectly and never showed any signs of corrosion on the connectors even though it was exposed to the elements.
John - 12/21/2018


I had great difficulty finding this 6-pin "Square" connector elsewhere. I was pleased that etrailer had it and the price was excellent. Delivery was prompt and the part was as advertised.

My only complaint is that the wiring "color code" did not match what I expected from the existing connector on my camper and other wiring diagrams that I had seen. This caused some minor problems initially. Though, I was able to work through it.

I'd certainly use etrailer again for similar part needs.


Delivered in very timely manner. Very easy to install. Works great. Very happy with motorcycle to trailer wiring harness. It cleared up several problems I was having trying to mate the trailer to the motorcycle.


Excellent product Excellent Customer se rvice


Used to connect 3D printer to power supply that needed to be separated when using a thermal enclosure. Connectors working great.


This was exactly what I needed for a non-trailer application. I used a pair of these connectors for my antenna rotator wire connections so that I could disconnect them when I was moving the setup. The gauge of the stranded wire is substantial and easy to work with when stripping to make connections. Using it both under screws and soldering to other cables was easy. Color-coding matched the current cables. The two connectors might use a bit of light lubrication to more easy push together and pull apart.


Great FAST service and fortunately it was the correct size I needed.. bought the camper used with just pigtail.. Not quite as heavy of wiring I would like as my truck and camper are larger.. #10 or #8 on the power wires would be nice!
But for the price and it serves the tail lights well.. a fair deal... will be buying a decent 7 pin 10' jumper and do it right!

Show More Reviews

Ask the Experts about this Hopkins Trailer Wiring

  • Replacement 6-Way Square Connector Recommendations for a Trailer
    For a set of replacement 6-way square connectors you would want the part # 37995. This part number comes with both the trailer and the vehicle side connectors so you would have a spare for your vehicle as well. I attached a review video for you to check out as well.
    view full answer...
  • Troubleshooting Flashing Trailer Lights After Replacing 6-way with 4-Way
    It sounds like you wired up your new 4-way wrong. What you will want to do is use a 12-volt battery and jumper wire to test all of the wires of your trailer so you can determine their function and then wire up the trailer to your new 4-way according. The white wire of your 4-way will be the ground, brown will be running lights, the yellow will be left turn/brake, and the green right turn/brake.
    view full answer...
  • 6-Way Trailer Wiring Harness on an Escapade Trailer Towed by a Motorcycle
    The red wire should be brake lights and the black wire 12 volt power. But since there is no standard for wire color, it could be the other way around. The best way to determine the functions of the wires on the bike side would be to use a circuit tester such as # 3808. After you verify the functions on the bike side you can trace the wires from the trailer connector to where they terminate on the trailer to determine its functions. From what I have learned there is a power wire on the...
    view full answer...
  • Replacement 6-Way Square Connectors for a Jayco Pop Up Camper
    Sounds like you are looking for the part # 37995. This is a pair of 6-way connectors that Jayco uses on their pop-ups.
    view full answer...
  • 6-Way Motorcycle Trailer Connector that Doesn't Require Mounting
    How does a 6-way SQUARE sound? Based on what you described the part # 37995 would be your best option as it comes with both sides of a 6-way connector that neither require mounting permanently to the motorcycle or trailer. The reason I recommended this is that there are no 6-way flat connectors and the round ones are designed to be mounted on the vehicle side. I attached a review video for this for you to check out as well.
    view full answer...
  • Is 6-Pole Square Trailer Wiring Connector Kit # 37995 Same As Older Style 6-Way Square Connector
    The 6-Pole Square Trailer Wiring Connector Kit # 37995 that you referenced is the standard 6-way square connector that has been used on campers for several years. It would be the same style of connector you have already so this would work as a replacement.
    view full answer...
  • Troubleshooting Left Turn Signal on Dutchman Duck Pop-Up Camper
    The Jayco Adapter you mention, part # 30104 will only work with Jayco campers. It sounds as if you have two separate issues going on. The issue with all of the lights flashing is caused by an insufficient ground connection. Check the ground connection for the trailer connector on the tow vehicle, make sure it is connected securely to non-corroded metal. The camper itself will also have a ground connection, usually on the trailer tongue. Follow the white wire back toward the camper from...
    view full answer...
  • Running Lights Do Not Work on Yakima Rack and Roll Trailer Pulled with a 2008 Saturn Vue
    The first step I would take is to check the vehicle side and trailer side connectors for any corrosion or dirt build up that could cause a bad connection and clean it out. If the connectors look clean, then you should use a circuit tester, # 40376, to check the trailer connector on the back of your 2008 Saturn Vue. Make sure you are getting a signal at each pin when that function is activated. I have attached a video of my co-worker testing a 4-flat trailer connector for you to reference....
    view full answer...
  • Trailer Hitch Wiring Recommendation for a 1998 Jayco Pop-Up Trailer
    Yes, you could use the 6-Pole Square Trailer Wiring Connector Kit # 37995 on your 1998 Jayco Pop-Up trailer. If you have a 4-way on your tow vehicle you may also be interested in purchasing a Adapter 4 Way Flat to 6 Way Square for Jayco # 30104. With this product you could just plug this into your tow vehicle and then into your trailer and you would be ready to go. By doing this you will lose 2 functions of the trailer wiring, most likely one of them being a 12-volt power source.
    view full answer...
    Image 1 for
  • Parts Needed to Connect Vehicle with 4-Pole to Trailer with 6-Way and Separate Brake Lights
    Since your vehicle's 4-pole wiring harness uses stop and turn signals that are combined on one wire, the green and yellow wires, you will use Vehicle to Vehicle Tail Light Converter # 118158 which takes in those combined signals and separates them out onto individual wires at its output side. Your Brown running light wire will simple bypass the converter and go directly to the trailer connector. Rather than use adapters to connect the tow vehicle and trailer I suggest you wire in a matching...
    view full answer...
  • 7-Way Trailer Connector for a Truck that has a 4-Way Flat Connector
    Are you sure it is a 6-Way and not a 7-Way blade style such as # 37185? The center counts as a pin. I have not heard of a 6-Way blade style connector, not to say that it doesn't exist but I haven't seen one myself. There might also be a way to add a 7-Way to the truck without having to cut or splice anything. If you can tell me the year, make, and model of the truck I can determine if there is a 7-Way that will work other than a hardwire option.
    view full answer...
    Image 1 for
  • Difficulty Fitting Male And Female Sides Of 6-Way Square Adapter Together
    The first thing I recommend is to make sure the pins on the # 37995 are not bent and they align before connecting the two harnesses together. If it seems excessively tight or difficult to connect I recommend using some dielectric grease like part # 11755. This may provide enough lubrication to allow these two connectors to slip together a bit easier.
    view full answer...
  • Wiring Functions for the 6-Pole Square Trailer Wiring Connector Kit # 37995
    On the 6-Pole Square Trailer Wiring Connector Kit # 37995 the white wire is the ground. Brown is running lights Green is right turn Yellow is left turn Blue is brakes Red is brake lights On a 6-Way that has combined brake light and turn signal it is usually the red wire that will be 12 volt power and the green and yellow wires will have turn signal and brake light functions. However you cannot go by color when wiring up a new harness or harnesses. You have to go by the functions by using...
    view full answer...
  • Replacing 6-Way Square Connector on Jayco Trailer and Using Adapter # 30104
    The Jayco 6-Way square connector is unique to those trailers and # 37995 wouldn't be a good fit for adapter # 30104. But, it you were to order # 37995 any way you could use it by replacing the 6-Way end on # 30104 with the vehicle side 6-Way that comes with # 37995.
    view full answer...
  • Troubleshooting Possible Trailer Ground Problem on Jayco Pop-Up Camper
    What you describe sounds like a ground problem. With the running lights on, full power is being sent through the lighting system and that's when the problem would manifest itself. If the prong for the ground connection broke, it would certainly explain the problem you're having. If it's the actual prong from the connector that broke off soldering it wouldn't be strong enough, I'd recommend replacing the adapter with part # 30104. Be sure to check the grounds on the pop-up as well. The...
    view full answer...
  • Is there a Replacement Junction Box for a 1997 Dutchman Aristocrat
    We have numerous junction boxes but if you are talking about the transfer switch/fuse panel then we do not have those types of parts and you would need to speak with the trailer manufacturer for a recommendation. If it is just a regular junction box such as # 38656 then we do have those. I have included a link to them below for you.
    view full answer...
  • Finding a Reverse Light Wire to Tap Into on a 2014 Hyundai Santa Fe for Trailer with Surge Brakes
    You will need to add a 4-Way to 7-Way adapter such as # 37185. The 4-Way will plug right into this adapter. Then you will ground the white wire to the frame. The blue wire you will not need since the trailer has a surge coupler. The black wire is for 12 volt power which you may or may not need. And the purple wire is for the reverse lights. There are a couple of possible places you can find access to the reverse light circuit. It is possible that there is a reverse light wire bundled with...
    view full answer...
  • Adapting a 6-Way Trailer Connector to a 6-Way Square Connector
    Your best bet would be to remove the square connector on the camper and replace it with a 6-way connector, item # PK11604, to correspond with the connector on your truck. If you do not wish to do this, you could fabricate an adapter using a 6-Way Trailer End Connector, part # PK11604 and a 6-Pole Square Trailer Wiring Connector Kit, part # 37995. You will want to make sure to wire the connector so that the vehicle and trailer side are wired identically. LOCATE WIRES BY FUNCTION ONLY White...
    view full answer...
  • Connecting a Coachman Pop-Up Trialer with 6-Way Square Connector to a Vehicle with a 7-Way RV
    To use your trailer with a vehicle that has a 7-Way connector installed on it you would be best suited to just use the Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End, item # PK12706, and hard wire it directly to the wires on the trailer. You will then have the functionality needed to provide power to the trailer brakes and have power to maintain a battery on the trailer if it is so equipped. Another advantage is that you will have no need for an adapter between...
    view full answer...
  • Making a 6-Way Square to 4-Way Flat Trailer Wiring Adapter for a Motorcycle and Trailer
    Your question is perfectly clear, and it is one that has come up before. Putting a 4-Way flat on the trailer is easy enough. You can use a trailer side 4-Way and splice it to the existing trailer wiring by function. The adapter for the 6-Way square to 4-Way flat is going to require a little more work. I recommend starting with the 6-Pole Square Trailer Wiring Connector Kit, # 37995. You will need the end that plugs into the vehicle side to make an adapter. You can then use Quick FixTM...
    view full answer...
  • How to Make a 7-Way to 6-Way Square Jayco Trailer Connector Adapter
    Yes, the Jayco trailers use a very unique wiring on their trailers. There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts: 7-Way trailer connector # H20042 6-Pole Square Trailer Wiring Connector Kit, # 37995 Start by identifying the wire functions of the trailer side connector so that it will be easier to wire in the 7-Way later. Connect the 7-Way wires on H20042 to the vehicle...
    view full answer...
  • Is the 6-Pole Square Trailer Wiring Connector Kit Water Proof
    I wouldn't say that the 6-Pole Square Trailer Wiring Connector Kit # 37995 is water proof. It is weather resistant. If submerged for long enough water could still get to the pins. That is why we recommend using dielectric grease such as # LT37534 on electrical connections to repel moisture.
    view full answer...
  • Six Pole Trailer Connector Vehicle and Trailer Ends for a 1995 Coleman Pop Up Camper
    The Curt 6-Pole square wiring connector loop # C58034 is only available in the 12 inch length. It should work with your 1995 Coleman pup. The Jayco square plug was the one oddball and if you had a Jayco this harness likely would not work properly but for a Coleman it should be fine. We also have # 37995 which is a trailer and vehicle end. The wires on it are 11-3/4 inches long for each side for a total of 23-1/2 inches.
    view full answer...
  • Solution for Towing Trailer with 6-Way Square with Truck with 7-Way
    To make a 7-way to 6-way square adapter will require you to get the part # 37995 to use the 6-way end and then wire up a 7-way to it like part # H20043. This will give you the adapter you would need since there isn't one already pre-made. Or you just cut off the 6-way and wire the # H20043 to the wiring in place of it.
    view full answer...

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