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Quick Fix (TM) 4 Pole Flat Trailer End

Quick Fix (TM) 4 Pole Flat Trailer End

Item # HMC20031
Our Price: $5.60
Trailer Wiring
Shipping Weight: 0.06 lbs
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Great Prices for the best trailer wiring from Hopkins. Quick Fix (TM) 4 Pole Flat Trailer End part number HMC20031 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (62)
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  • Videos (1)
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Hopkins Trailer Wiring - HMC20031

  • Trailer Connectors
  • Trailer End Connector
  • 4 Flat
  • Plug Only
  • Hopkins

Quick Fix 4-Pole Flat Trailer End Only

  • Replaces damaged 4-wire flat
  • No external splices
Product Detail

Picture of the Vehicle End.
Easy to use:
  1. Remove damaged 4-wire flat (if necessary)
  2. Insert wires into Quick-Fix 4-wire flat
  3. Press on cap
  4. Connect vehicle to trailer and go!
NOTE: Ground (gd) is the white wire. Tail/marker lights (TM) is the brown wire. Left turn (LT) is the yellow wire. Right turn (RT) is the green wire.

20031 Quick Fix(TM) 4 Pole Flat Trailer End

California residents: click here

Video of Quick Fix (TM) 4 Pole Flat Trailer End

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

Video Transcript for Hopkins Wiring - Trailer Connectors - HMC20031 Review

Today we're going to review part number HMC20031. This is the Hopkins Quick Fix 4-way flat trailer end connector. Now this is used if you happen to have a damaged 4-wire flat on your trailer and you need to replace it, or if you just have some pigtail wires and you want to put a 4-way plug on the end, you can use this part for that. Basically what you would end up doing there when you just put your wires right in here. Lay the bare part of the wire right into the connector, and then take your cover plate, once all the wires are in. Just go ahead and put this in, and then push it all the way down and it will actually lock into place. It protects your connections, so there's no external splices. Basically just to give you an idea, I have a sample here.

You can see: here's your normal four wires you'll see on a 4-way flat. You've got your white, brown, yellow, and green. Basically on your trailer, if you have a damaged connector, you cut it off. You have these wires, or if you just have the wires and you need a 4-way, basically what you would do .. and what also helps you out is on this 4-way, it's actually marked.

It says "RT" for right turn. "LT" for left turn. "TM" for the tail lights, and then "GD" for ground. Basically it shows you where the wires. Now normally on a 4-way, you have this normal color combination here, but what I would recommend to do is actually probably put power to each circuit to make sure and verify. Just don't always go by the colors.

It's always good to test the circuit to make sure it lights up the correct circuit you're going to install in here. Basically all you'd end up doing is taking you're . Like, in this case, it says right turn . Your white is the ground. Brown is the tail lights. Your yellow is your left brake and turn signal.

And your green is your right turn and brake signal. You'll see the end one says right turn, so we take our right turn, which is the green. You just lay the wire in there and then you take the exposed portion and you actually push it down and it will actually clip in there and hold into place really tight. Then once you get all four put in there, again, you just put this on there, push it into place and you'll be ready to go. But that should do it for the review on part number HMC20031. This is the Hopkins Quick Fix 4-way flat trailer end connector. .

Customer Reviews

Quick Fix (TM) 4 Pole Flat Trailer End - HMC20031

Average Customer Rating:  4.5 out of 5 stars   (62 Customer Reviews)


Well I received only the larger of the two parts and it was loose in the envelope with absolutely no packaging making this product worthless. I spoke with etrailer customer service and they are sending out a replacement product.


I like the idea but the connection is not always secure and needs to be adjusted.


These connector will work great


Easy to install, have some channel lock plaids to lock top piece in.


This is the first time I've used this particular product manufacturer. In the past I used a similar trailer end from Reese. Installation was easy other than ensuring that all four wires were properly aligned with the forked terminals. I used a hammer to lightly tap the cover in place, and ensured the "clips" on the ends of the cover were securely in place. Time will tell if the "clips" will stay secured. Reese uses two small screws to keep the cover in place. Thanks eTrailer!


Product was exactly what was needed. Much better than dealing with multiple wire nuts. If you can replace an extension cord plug, why not a trailer plug? Why are these things not in the big box stores? Was surprised the product was as hard to find as it was (google searching).


This product was super-helpful and reliable for connecting our microlite trailer with a campsite's electrical hookup. :)


Product was delivered on a timely basis and was exactly what I was l;looking for. Original wiring keep breaking at entry point into plug. Now I if that happens I can make a "quick fix" repair. Bought 3, an extra one for myself and one for my son.


Only one of four wires penetrated the copper wiring thru the sleeve when the cover was installed. Sure, you can remove the cover & wiring and cut a slit where the wires were intended to pierce, but, that defeats the whole purpose of just slipping the wire into each corresponding section and having the cover push down the wires to get pierced.


This product perfectly suited my needs. Also it was a very easy to connect the wires from an existing harness to this connector. I had it assembled in less than 5 minutes


The connector worked as hoped. I usually stay away from the quick-connect type wire connectors but this one worked first time and was extremely easy to install. Good quality connector.


Good concept; it just didn't work. I gave up on crimp connectors and these press in connectors and learned how to soldier.


I love these things, Im a contractor and a sports men. I am changing all my trailers to these and keeping some around for the ease of quick repair


Quick, easy, affordable. Perfect replac ement.



Trouble free solution.


The trailer wire end worked better than I hoped it would.The folks at e-trailor are greatly order was shipped within an hour after I ordered it and got here reasonably fast!


The only problem was the body of the unit was extremely flexible and flimsy. Although it worked for it's designed purpose, it didn't seem at all durable and at best, seemed to be a temporary measure.


connector would not allow a 5 strand hook up.(wishbone set-up). Broke fairly easily..


The service rep was terrific. She analyzed the alternatives and made helpful add-on recommendations without any pushy "up selling."

etrailer comes through once again!


Easy to replace and done in a few minut es


worked great. easy installation


Great product. Fast delivery from trailer as always thanks


Got repair plug inpressed with quality. Will probely order more parts.


A good value



Product has worked fine dont abuse it. Though also gets little use abuse.


I am no handyman or mechanic whatsoever and I was able to instal it myself. broke it and I was also able to fix it my self.

Easy to instal and easy to use.


It works perfectly. Thanks etrailer.

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Quick Fix 4-Pole Trailer End - HMC20031 - Which wire goes where?
    It would be much easier if they would just put the color, but here it is. Gd is ground (white wire), TM is tail/marker lights (brown wire), LT is left turn (yellow wire), RT is right turn (green wire).
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  • Replacement 4-Way Connector For Wishbone Trailers
    Your utility trailer has a wishbone wiring harness therefore, in order to replace the connector you will need the Quick Fix (TM) 4 Pole Flat Trailer End part # HMC20031. There is an extra running light wire on the wishbone harness that runs down each side of the trailer eliminating the need for a jumper wire. The Quick-Fix connector is designed to replace your existing 4-way without the need to hardwire or splice any wires. To install, you will need to sever the wires just before your...
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  • How To Change Wrong 4-Way Connector On A Trailer From Vehicle End Connector To Trailer End Connector
    I would recommend to use the Draw-Tite T-One Wiring Harness, # 118379, on your 1992 Toyota Pickup. This will give you the correct harness for your vehicle with a 4-pole flat connector at the rear of your vehicle. This harness will plug in behind the drivers side taillights and passenger side taillights. On your trailer you can remove the 4-pole flat vehicle end connector that is on there now and attach the Hopkins Quick Fix(TM) 4 Pole Flat Trailer End, # HMC20031. This will give you a...
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  • Replacement Trailer Side 4-Way Connector
    Thanks for the picture. It looks like you broke the 4-way connector off of the Curt Auxiliary LED Indicator Lights item # C53201. Curt doesn't offer any direct replacement wiring harnesses but you should be able to cut off the connectors and install the wires in the Quick Fix (TM) 4 Pole Flat Trailer End item # HMC20031.
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  • How To Convert Escapade Elite Motorcycle Trailer From 6-Pole to 4-Pole
    The best option for you to be able to pull your trailer is to remove the trailer connector on the trailer and replace this as there isn't any sort of adapter. If the trailer has combined stop/turn lights then you can use the Quick Fix 4 Pole Flat Trailer End part # HMC20031 which doesn't require any tools. If the trailer doesn't have combined stop/turn lights then you will need the Vehicle to Vehicle Tail Light Converter part # 118158 in addition to the Quick Fix 4 Pole Flat Trailer End...
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  • Trailer Connectors to Insert Trailer Wires Into
    It sounds like you're looking for the Hopkins Quick Fix trailer connector ends. We have just the trailer side, part # HMC20031, or a combo of the trailer and vehicle sides, part # 48195. If this isn't what you're looking for let me know.
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  • Replacing 4-Way Plug on Trailer Wishbone Harness with 5 Wires
    You can indeed connect a standard 4-Way plug like the Hopkins # HMC20031 to the 5-wire wishbone harness on your boat trailer. A wishbone harness uses a separate running lights wire for each side of the trailer (instead of having to run a jumper wire across at the rear). To connect the wiring to the new 4-Way you will just need to connect the 2 running lights wires together (which should both be brown but you will want to test them to be sure) using a butt-connector like # 05731-5. You...
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  • Is There a 4-Round to 4-Flat or 7-Blade Adapter for Flat Tow Magnetic Lights
    There aren't any 4-round to 4-flat adapters for the vehicle side but what you could easily do is just cut off the 4-round connector on the light harness and hardwire on a 4-flat using part # HMC20031 or a 7-blade using part # PK12706.
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  • Converting 5-Wire Separate Wiring on Motorcycle Trailer to Combined 4-Wire Setup
    The easiest way to convert your Time Out trailer to standard combined 4-Way setup is to use the Curt 2-to-3 Converter # C56196. You will first just need to cut off the existing 5-Way connector on the trailer. Then on the output side of the converter the green wire will connect to the green wire on the trailer. The yellow wire on the converter will go to the yellow wire on the trailer and the red wire will go to the red/blue wire on the trailer. The brown running lights wire won't go through...
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  • Can the Quick Fix(TM) 4 Pole Flat Trailer End be Used with Wishbone Trailer Wiring
    A wishbone wiring harness is simply two wires coming out of the running light circuit, one for each side of the trailer, so you do not have to run a jumper wire from one side to the other. If you have wishbone wiring you can still use # HMC20031. You would splice one a few inches back from the trailer connector into the other tail light wire and then attach the single wire to the Quick Fix 4-Way. The other option is to use a wishbone trailer side 4-Way, # A20WB, and cut of the wire to...
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  • Replacing a 4-Round Connector with a 4-Flat on a Bayonet Trailer Towed by a 1999 Lincoln Navigator
    If your trailer has a 4-Round that looks similar to # PK11402, you can clip off the plug and connect the wires to a 4-Flat that will fit the 4-Way on the 1999 Lincoln Navigator. You can use the Quick Fix(TM) 4 Pole Flat Trailer End, # HMC20031, or directly wire a trailer-side 4-pole connector like # 18004. The shielded pin is the ground and is usually a white wire. The pin next to that is for the tail and running lights and is usually a brown wire. The next pin is for left turn and is...
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  • No Running Lights After Installing Aero Pro Trailer Light Kit TL36RK
    If the running lights have worked on other trailers then we can narrow down the issue to your trailer and not the tow vehicle. The first thing you will want to do is test the brown wire directly behind the trailer plug. If there is no power then you have a connection issue between these two plugs. That said, you can easily wire a new plug on with part # HMC20031. If you do have power here then you will need to begin tracing this brown wire back while testing it with a volt meter to see...
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  • Replacing Damaged 4-Way Connector on Trailer with 8 Wires
    Standard trailer wiring usually features a wire for right turn/stop, a wire for left turn/stop, a wire for the running lights, and a wire for ground. Your trailer likely has separate wires for each function along with a couple of ground wires. In order to replace your broken 4-Way with a new one like the Hopkins # HMC20031 you will want to first test the wires on the trailer by applying 12V power to them (or trace them to where they lead to) to determine their function. Then it is just...
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  • Blue Ox Diode Tail Light Wiring Kit Compatibility with 2008 Ford Taurus X
    The Blue Ox Tow Bar Wiring Kit - 4 Diodes # BX8848 will work well for your 2008 Ford Taurus X. When using the BrakeBuddy # HM39530 you won't need to use a relay or anything to change the functions. It is a simple installation with no additional fuses, bypass systems, or relays needed. You will not need to remove fuses to tow. The only thing you need is a 4-way connector to install on the wiring harness so it can plug into the Brake Buddy. Part # HMC20031 will work fine. It is recommended...
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  • How Do I Convert My 5 Wire Flat to a 4 Wire Flat
    It sounds like you have the normal set-up: green wire for right turn and brake, yellow wire for left turn and brake, white wire for ground, brown with green stripe wire for right side running lights and brown with yellow stripe for left side running lights. Using a connector like the Quick Fix (TM) 4 Pole Flat Trailer End # HMC20031, you can connect color for color the green, white, and yellow wires. As for the brown with green stripe and the brown with yellow stripe, these will both need...
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  • Installing Connector on Trailer with Electric Brakes and Battery Wire
    A 4-Way flat trailer connector like # HMC20031 does not have a pin/circuit for the 12V battery wire. A 4-Way like this will only work to connect with another 4-Way on the tow vehicle so that the trailer's basic signal lights (brake light, turn signals, running lights) are powered. If your trailer is equipped with electric brakes and you need the 12V wire to maintain the charge on a battery (or power a 12V accessory) then you will need to have a 7-Way connector on both the tow vehicle...
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  • Can a Junction Box be Used for 4-Way Flat Trailer Connector
    You could technically use a junction box like part # 3375601101 for a 4-Way connection, like part # HM38134, but since junction boxes are designed for 7-Way connections you'll need to find a way to plug up the larger hole since you're only going to be running 4 wires through it instead of all 7. We do carry some different style 4-Way connectors like the Quick Fix # HMC20031 which make connecting the wiring a little quicker but I feel like this isn't as solid or secured of a connection...
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  • How To Replace 4-Way Trailer Connector with 5 Wires with One That Has 4 Wires
    In order to replace a trailer side 4-way connector that has five wires like the 20 Ft 4-Way Trailer Wiring Harness part # A20WB with a trailer side 4-way connector that has four slots/wires like the Quick Fix 4 Pole Flat Trailer End part # HMC20031 you'd simply need to combine the two brown wires as they are running lights for each side of the trailer. In regards to the trailer lighting issue, you likely have some sort of short on the green wire or a loose connection.
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  • Converting a Trailer with a 6 Square Connector to a 4-Way Flat Trailer Connector
    If the trailer is a Jayco trailer, you will just need the 4-way to 6-way round adapter # A10-6034VP and then the 6-wayd round to 6-way square adapter # HM47415, to go from the 4-Way flat on the 2006 Honda Odyssey to the 6 square on the trailer. If the trailer is a different brand, this adapter will not work. Instead, you will need to convert one of the connectors to be compatible with the other. If you convert the trailer, the other 2 functions on it will be lost unless you converted it...
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  • Alpena Trailblaze Tailgate LED Light Bar Does Not Show Passenger Side Lights
    For starters, I recommend that you check the ground for the 4-way trailer connector on your vehicle as this could very well be causing your issue. If the ground checks out then this leads me to believe there is an issue with the trailer connector on your 2004 Chevrolet Silverado or the trailer connector on the Alpena Trailblaze Tailgate LED Lights part # ALP77229. I see you said that you replaced the 4-way but I didn't catch if it was the 4-way on the vehicle or the 4-way on the light...
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  • Replacing 4-Way Connector on Trailer with 8 Wires
    For just the needed 4-Way by itself I recommend the Hopkins Quick Fix # HMC20031 that features a removable cap that makes it easier to insert the wiring from your trailer. From the looks of the picture you attached you probably have three ground wires (white) and three running light wires (brown), the remaining green wire being for right side turn/brake and the yellow for left side turn/brake. With that being said I highly recommend still testing them each for function for verification...
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  • Is the Harness Included with the Hopkins Trailer Connecotr HM47180 Available Separately
    It sounds like you are looking for the wiring harness portion of the Hopkins Endurance Multi-Tow 4-Way Flat to 7-Way RV Trailer Adapter part # HM47180. If that is the case then this part is not available separately but you can obtain something similar with the Pollak Wiring Harness Extension part # PK11-934 and the Quick Fix 4 Pole Flat Trailer End part # HMC20031. If you need butt connectors to finish up your connections you can use part # DW05745-5.
    view full answer...
  • Availability of Adapter to Go from 4-Pole Round on Trailer to 4-Pole Flat on Vehicle
    I do have a couple options for you, but there isn't an adapter to go from a male (trailer end) 4-pole round to a female (vehicle) 4-pole flat or even a 7-way. So, you could either make your own adapter using part # PK11410 and # HM38138, if you do not want to modify the harness on your magnetic trailer lights, or you could simply replace the 4-pin round connector on them with part # HMC20031, which is going to be the most cost effective.
    view full answer...
  • Short Trailer Side 4-Way Trailer Connector to Replace a Damaged 4-Way
    Yes, there are some trailer side 4-Ways that have short leads or no leads that you could use. We have the Hopkins model # HM48110 that is 12 inches long. Another 12 inch long model is # 18004. And then we have Quick Fix connector # HMC20031 with no wires. I have included a link to these and other options for you.
    view full answer...

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Expert Research:
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Employee Laura H
Updated by:
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