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7-Way Molded Trailer Wire Connector, 4' Long

7-Way Molded Trailer Wire Connector, 4' Long

Item # H20043
Our Price: $33.90
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Trailer Wiring
Shipping Weight: 1.27 lbs
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Great Prices for the best trailer wiring from Hopkins. 7-Way Molded Trailer Wire Connector, 4' Long part number H20043 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (308)
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Hopkins Trailer Wiring - H20043

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Blade
  • Plug and Lead
  • 0 - 5 Feet Long
  • Hopkins

Trailer Connector RV Style 7-Way Blade with 4' lead

  • Pre-wired 7-Way Trailer Connector
  • Measures 4 feet long including connector
  • Wire gauges:
    • 14 Gauge - red, brown, green, and yellow
    • 12 Gauge - Blue
    • 10 Gauge - White and Black

Wiring Code
Molded Connector Function Usual Trailer Wire
White Wire Ground White Wire
Red Wire Left Turn and Brake Yellow Wire
Brown Wire Right Turn and Brake Green Wire
Green Wire Tail Lights Brown Wire
Blue Wire Brake Power Blue Wire
Black Wire 12 volt (hot lead) Black Wire
Yellow Wire Aux. -

Hopkins # 20044

20043 7-Way Molded Trailer Wire Connector, 4' Long

California residents: click here

Customer Satisfaction Score:

Customer Reviews

7-Way Molded Trailer Wire Connector, 4' Long - H20043

Average Customer Rating:  4.7 out of 5 stars   (308 Customer Reviews)


Trailer wiring was too short for use with a weight distributing hitch.
Cut this to length and attached a plug on the end.
Plug the trailer wire harness into this extension and other end to truck.
Saved cutting and extending original trailer wiring.


The quality of this trailer plug connector should make it last forever! The seal at the end will withstand the constant bending and twisting that this daily-use utility trailer will put to it. The blade style RV plug end will fit any factory equipped pickup receptacle so I can use multiple tow vehicles.



Still working fine after a year in my Coastal saltycorrosive weather.


Right now 3 stars. Received the connector 12 Oct 2021. The cord on the trailer had the same connector on it which worked if you manipulated the pins to make connection (reason for replacing). The wiring colors on trailer, old connector snd new connector are the same, so adding new connector wasn’t a problem. When I plugged into the vehicle and tried the lights, nothing worked properly. The only time any lights came on was when right turn or hazard switches were activated and ALL the lights on trailer came on flashing. Tried the connection on 2 vehicles with same result. Called etrailer and they are sending another connector. Will give update then.



Replacement connector worked. Thanks gor the good customer service.


Fast delivery and great price.

James M.


The harness is of great quality and well marked for installation.


The cord worked well, the length was just right for my set up!


This umbilical has different gauge wires within it. The heaviest gauge being #10, which should correspond to the brake power supply and ground. It does not. Only one of the two #10 wires corresponds with brakes, the other one is going to a light’s blade on your vehicle’s socket. So all the effort spent on ensuring that you wired your brakes with the required #10 wires is lost when you splice this connector to your trailer. You’ll have #10 positive to your brakes yet the ground will be #12 or #14. Grounds are always the weak link in 12 volt electrics.


Excellent Product from a great Company





Used this on my snowmobile trailer. The cable outer jacket is to rigid (Not flexible). Gets worse in colder temps. Don't recommend it for cold use. Picture is in garage at 53F. Cable is so stiff it won't fall on the floor.


As always, I got exactly what I ordered, on time without any glitches. Etrailer are my go to guys for all my trailer accessories. Great company to do business with.


Very good quality


Great quality, affordable and easy wiring. The extra length let me change the configuration to better suit me trailer/truck setup.


great workmanship, high quality parts


Great customer service


the wire colors doesn't match standard wire colors, need to determine which wire color corresponds to what position on the connector end. other than that quality and construction is good.

Etrailer Expert

Jenny N.


The Hopkins part # H20043 uses the following wire coloring: White Wire - Ground Red Wire - Left Turn and Brake Brown Wire - Right Turn and Brake Green Wire - Tail Lights Blue Wire - Brake Power Black Wire - 12 volt or hot lead Yellow Wire - Aux. I recommend wiring your trailer by function and not color. If there is a circuit you do not need for any reason it does not have to be connected.


It works. After I spent the time putting this in, figuring out the color code, then testing it in a socket, when I realized that the plug only uses one contact blade per wire. Which is plainly shown in the picture but I was expecting a higher quality plug like the one that I replaced so didn't notice that in the picture. In is in and works. Not worth spending the time and money to replace it until needed.


Be careful! The wire colors on this harness do not follow standard trailer colors. Make sure you follow the chart listed with the product.


Check the function of your wires on Trailer and Truck! Product is perfectly fine. It's wired for RV Traditional. My Truck is RV Traditional. My Trailer is SAE Standard. Took me a minute to figure it out. My advice... hook this up to your truck and with a meter and test light confirm the function of each wire. Do the same with your trailer. If you don't understand that... hire someone that does. awesome as always.


Placed order on Saturday, hadn’t shipped by Tuesday. Called and spoke with Alex J who was professional, knowledgeable and helpful. She did a great job.


I fabricated a receiver hitch motorcycle rack, I used trailer wiring and led lights, so I have lights on the rack. Just plug it in to the truck trailer plug. Good quality and instructions with etrailer supply's.Thanks


Everything was Delivered quickly. The plug fixed my issues with my trailer brakes and the new jack is so much better than the manual recommend it to everyone easy install




This is the second one I have ordered from E trailer and it works well.


My horse trailer OEM unit was brittle and stiff, after just a few years. This new wire harness from etrailer fixed the problem and was easy to install. It is even a little longer then the OEM, so there is more more room for turning sharp corners.

Dave J.


Still works great. Great connection with the tow vehicle, and still very pliable wires!


Bought a 20 year old horse trailer and needed to rewire it. The original pigtail had a 6 terminal plug, my new pick-up had a flat four and a 7 pin. When I bought it the guy gave me a 6 to 7 pin adapter but it didn't allow electric brakes. They are required in my state for a trailer over 1500 lbs. Think trailer with two horses. So I bought this pigtail. It is top quality and has large gauge wiring. I also needed break-away switch so I needed a battery. This pig-tail has #10 wires for both 30 amps (+12V) and Chassis ground. This really puts a charge in the trailer battery. (would do the same for an RV) Then #14 wire for the brake signal. This plugs right into the seven pin plug on my pickup with the tow package. Highly recommend.


Works as designed

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Replacement Trailer 7-Way Recommendation for a 2002 Viking Legend Camper
    The trailer side 7-ways we offer like the part # H20043 all have blunt cut wires that you could splice into your trailer's wiring, but we do not have any 7-ways that have any connectors like what you described. You could still wire in the part # H20043 though. I attached a chart that details how this harness would typically get wired to a trailer. You can still send me a picture though and I will take a look at it.
    view full answer...
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  • Color Code Functions of Hopkins 7-Way Trailer Wiring Harness
    The Hopkins # H20043 uses the following wire coloring: White Wire - Ground Red Wire - Left Turn and Brake Brown Wire - Right Turn and Brake Green Wire - Tail Lights Blue Wire - Brake Power Black Wire - 12 volt (hot lead) Yellow Wire - Aux. I recommend wiring your trailer by function and not color. If there is a circuit you don't need for any reason it doesn't have to be connected.
    view full answer...
  • Which Pin On 7-Way Connector Is The Ground
    The ground pin of a trailer side 7-way connector like the 7-Way Molded Trailer Wire Connector, 4' Long # H20043 you were looking at is the 5 o'clock position as shown in the included picture. For the vehicle side of the 7-way connector it would be the 7 o'clock position. I included pictures of both of the wiring positions for both sides of the 7-way connector and a video of the # H20043 for you to take a look at.
    view full answer...
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  • Converting Trailer from 5-Way Connector to a 7-Way by Function
    I've linked a help article that will give you the common color coding but on your trailer I wouldn't go by it. Even if they are correct you just never know so I suggest testing it. To test it cut off the 5-way connector that's on there and connect each wire to a 12-volt power source and see what functions. Then use a 7-way connector like the Hopkins # H20043 and connect the function to the correct leads. Even the Hopkins does not use the traditional color coding. Instead it uses the...
    view full answer...
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  • How Should Utility Lights be Wired on a Trailer
    When you go to wire up the utility lights on your trailer the best way is to run the power wire to each light and then run the ground to either. Running them in series wouldn't be the best way since if one light goes out both go out like Christmas lights.
    view full answer...
  • Solution for Towing a Coleman Camper with a 6-Way Square Connector with a Tow Vehicle with 7-Way
    The connector you have on your trailer will need to be replaced as there isn't an adapter available for your setup. You will want to cut the 6-way round off of your trailer and replace it with a # H20043 by wiring it by function. You would want to apply 12 volts to each of the circuits on your trailer with a jumper wire and a car battery so that you can determine their function and then wire it to the # H20043 by function. I attached a chart that shows the colors of the wires and where...
    view full answer...
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  • Installing New 7-Way Trailer Connector on Dump Trailer With Different Wire Colors
    That is correct. As long as you make sure the functions match you won't have a problem. For example, a connector like the # H20043 uses a red wire for the left turn/stop which follows the RV Standard. To connect to the traditional SAE you would hook it onto the yellow wire which is also left turn/stop just like you said. Since the trailer is marked with RV standard wiring it is probably safe to assume the colors correspond with the following: Green: Tail/running lights Yellow: Reverse...
    view full answer...
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  • How to Make 7-Way to 6-Way Square Adapter for Jayco Camper
    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.
    view full answer...
  • Will Hopkins 7-Way Molded Trailer Wire Connector Work With Trailer Connector On 2013 Toyota Tundra
    The Hopkins 7-Way Molded Trailer Wire Connector # H20043 is designed to be installed on a trailer and is compatible with the 7-way connector on your 2013 Tundra. When installing this harness I recommend using a wiring junction box like part # 38656. I have attached a link to an installation video for the junction box and also a helpful article on wiring you can check out. You want to make sure you note what the function is for each wire when you are installing the harness on your trailer.
    view full answer...
  • 7-Way Recommendation for 2001 Coachman Clipper Pop Up
    A standard 7-way is going to work just fine on your trailer. That converter circuit will be for a 12 volt power source which a 7-way is going to have on the 1:00 pin. For the trailer side you would want the part # H20043 and you would be good to go.
    view full answer...
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  • Trailer Wiring Solution for a 1996 Forest River Pop Up with 6-Way Square
    We have a solution for you, but we do not carry the adapter you are looking for. A much easier solution would be to cut off the connector on your trailer and replace it with a 7-way like part # H20043 since that would make your trailer easier to connect to your vehicle and other vehicles. You would need to determine the functions of each of the wires on your trailer first. You can do this by running a jumper cable to each of the wires from a 12 volt battery. Once you do that you can then...
    view full answer...
    Image 1 for
  • 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...
  • Would a Boat Trailer Have a 7-Way Harness with only 5 Wires Ran to it
    It is very possible that your trailer has a 7-way harness installed on it and not all of the circuits are completed. For a 7-way and lead that is 4 feet long you would want the part # H20043. Then for a new junction box we have the # 38656. I attached an install video for you to check out as well.
    view full answer...
  • How to Make 6-Way Square to 7-Way Adapter
    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.
    view full answer...
  • Can Trailer Breakaway Battery be Replaced if Battery is Dead
    You can replace just the breakaway battery if it is dead, with the following: - Breakaway Kit Replacement 12 V Battery # HM20008 This battery measures 3-1/2" long x 2-3/4" wide x 4" tall, so you'll want to be sure it fits your battery box. Also, regarding the trailer wiring fault, it is either the 7-way or the wiring to the brakes. I would first check your 7-way (both on your truck and trailer) for corrosion as that can impede the signal, and if those are okay, check the wires leading...
    view full answer...
  • How To Replace 7-Way Trailer Connector On Trailer with 5 Wires
    In order to install a 7-way trailer connector like the 7-Way Molded Trailer Wire Connector part # H20043 on a trailer with five wires, we need to know what those wires do. I can almost guarantee what four of them are; left stop/turn, right stop/turn, running lights, and ground. If the trailer has brakes then the last wire is for the brake output. If the trailer has an on-board battery then the wire is for the battery charge line. If the trailer has backup lights or an electric actuator...
    view full answer...
  • Is Heat Shrink Available for a Replacement 7-Way Molded Trailer Wire Connector?
    I have a solution for you but the 7-Way Molded Trailer Wire Connector, 4' Long item # H20043 does not include heat shrink to cover the spliced area. You will need the Primary Wire Heat Shrinkable Tubing - 8 to 2 Gauge - Black - 6" Long - Qty 6 item # DW05402.
    view full answer...
  • Replacement 7-Way Recommendation for a 2006 Chevy Trailblazer
    For a replacement 7-way for your 2006 Chevy Trailblazer you would want the Tow Ready 7-way part # 74682. This also has a 4-way built into the side of it. You would just need to remove the harness from the back of your current 7-way and then plug it into the round connector of this harness. For a replacement 7-way for your trailer you would want the part # H20043. Since trailer wiring colors can vary from vehicle to vehicle your best option would be to use a jumper cable from a car battery...
    view full answer...
  • Solution for Damaged 7-way of Casita Travel Trailer
    Best option would be to cut off your damaged 7-way and wiring and then splice in a new one like with the part # H20043 which comes with a 4 foot lead of wire.
    view full answer...
  • Replacement 7-Way Trailer Connector with Short Wiring Harness for a 2017 Toyota Tundra
    For a replacement 7-Way trailer connector with short wiring harness attached for your 2017 Toyota Tundra you can use Curt harness # C55774. I have linked a video showing an example installation on a Jeep (which it also fits) for you.
    view full answer...
  • Hooking Up New Hopkins 7-Way Connector Harness to Trailer Wiring
    The Hopkins trailer wiring harnesses like the model 20244 you have feature wire colors that differ a bit from standard setups so this is likely why the new plug isn't working when splicing the wires color to color. For your 20244 plug, which is similar to our Hopkins # H20043, the wire color functions are as follows: White - Ground Red - Left Turn and Brake Brown - Right Turn and Brake Green - Running Lights Blue - Brake Power Black - 12V Power Yellow - Aux In addition to some of the...
    view full answer...
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  • How Can I Get Tail Lights on a Trailer with an Australian 7-Way Harness on My Trailer?
    The best route for having brake lights, turn signals, and running lights on your trailer with an Australian 7-way is to use the Vehicle to Vehicle Tail Light Converter # 118158. With this system, this will split up the wiring signals for your brake lights and turn signals on the left and right side. For installation, you will have to splice into your current wiring setup. I went ahead and attached a photo that shows the a 4-way wiring setup to give you a good idea of the process.
    view full answer...
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  • Short Circuit in Trailer Connector Melted Wiring and Causes Trailer Brakes to Lock Up
    On a 7-Way trailer connector there should not be a 24 volt wire. But wires could come loose and make contact with other wires inside the connector and cause a short which is what sounds like happened. I recommend replacing the trailer side 7-Way with # H20043 which also has a 4-foot lead of wires in case the problem exists further back in the wiring. On this harness the white wire is ground, red is left turn signal/brake light, brown is right turn/brake light, green is tail lights, blue...
    view full answer...
  • What is Needed to Clean 7-Way
    There isn't a specific tool to clean the 7-way connectors, but some simple household items will work. For example, use some pipe cleaner and white vinegar and that should get the job done. If you do have to replace your 7-way on the trailer side you can use # H20043. And to avoid corrosion and dirt build-up in your connectors I very highly recommend always using Dielectric Grease for Electrical Connectors # 11755.
    view full answer...

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