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Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long

Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long

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Epicord Trailer Wiring - 277-000141
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Epicord Accessories and Parts

  • Trailer Wiring
  • Junction Box
  • Epicord

  • Epicord 7-way molded trailer plug and 7-gang junction box
  • 10' Long heavy-duty cord
  • Wire gauge and function:
    • White (ground): 10 gauge
    • Black (12V power): 10 gauge
    • Yellow (reverse/auxiliary): 14 gauge
    • Red (left turn and stop): 14 gauge
    • Green (tail and running lights): 14 gauge
    • Brown (right turn and stop): 14 gauge
    • Blue (brake): 12 gauge
  • Weatherproof and corrosion resistant
  • Hardware included
  • cETL and ETLus Listing
  • Junction box dimensions: 8" long x 2-1/4" wide x 3-1/2" tall
  • 1-Year Warranty

Junction boxJunction box

RV078-10X Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long


Item # 277-000141

Customer Satisfaction Score:

Customer Reviews

Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long - 277-000141

Average Customer Rating:  4.7 out of 5 stars   (243 Customer Reviews)


The trailer plug/junction boxes worked out very well! Using them made it a lot easier to rewire the trailer.


I installed this product yesterday and it is a really nice product. It would be a great product if the darn wire colors from the plug were the same as the industry standard. But if you go by what is on the small mount that the wires screwed to it is accurate.

I got the longer 10' cable as I wanted to mount it further back than the stock metal electrical box that they mount all the stuff in from the factory. I ended up mounting it on the bottom side of the cross braces on the bottom side of the trailer.

I also installed a seperate fuse box to individually fuse all the circuits so that if anything on the trailer shorted out it wouldn't blow the fuses in the truck.

Dakar D.


I loved that I got the longer replacement so I was able to move it to a more easier place to access.


Very disappointed that the plug molding is too long for my truck's factory plug outlet. Look at it wrong and it'll fall out of the outlet. I tried trimming it down so the door would hold the cable catch, but the rubber is too soft.


Little over a year since install and no problem thus far with this product. The rubber grommets supplied with it keeps everything water tight. Wires are not colored coordinated! I overlooked that detail in product description and had to rewire everything, lol.

Etrailer Expert

Mike L.


Actually, theres more than one accepted wire color convention when it comes to trailer wiring color codes which is why we list the function for each terminal/wire color in the product description.


It was just as expected. Good quality and no hidden issues.

For everyone else’s essay, the studs are 5mm. So, for the best fit grab you some 5mm heat shrink ring terminals. 1/4in for the mounting hardware. This went on my boat trailer, so I grabbed some stainless steel 1/4in hardware and used nylon lock nuts. I used extension cord for my wire runs. A grounded extension cord will give you your 3 wire runs for the tail lights, a standard 2 blade extension cord for any marker/running lights. Heatshrink adhesive butt connectors on all connections. The wiring info that ETrailer provides was correct for my 2019 F150.

Overall makes for a solid trailer light setup. Highly recommend this junction box.


Used this to convert a trailer from 4 pin to 7 blade connector so that I could add brakes. Gives a nice place to terminate your wires. The wire color guide on the product page was very helpful when it came to wiring up the trailer. Plan on putting some type of sealant around the wires because unless you use a large 7 conductor wire there will be a gap where water could get in.


This product is great!! It is probably overkill for my little utility trailer but I was tired of re-wiring it for shorts in the crappy standard wire that came with the light sets. This junction box feels very sturdy and has the cable/plug is very hefty as well. Easy to setup. The colors didn't match what my car was but it is very simple to swap the terminals to what you need. I forgot to take more pictures through out my install.


This is worth every penny as far as im concerned. Makes wiring up everything on trailer from plug to tail light so much easier. The junxtion box also makes finding shorts easier since it is the hub for all accessories.


I do business with many prevailers but I have yet to find one equal to E trailer. They are fantastic people to do business with and quality parts. Thanks for being in there.


Last project built. Used etrailer for almost all parts, 7 pin wiring harness, junction box, tail lights, jacks vent cover and so. Love the leveling jacks. Friend wants one now so started another one. I will be getting all the parts from etrailer...


I needed to completely rewire my landscape trailer because of the poor quality of the original components. This is quality hardware. The only issue I had was the color/functions of the new component did not exactly match with the color/functions on my trailer. It was not a difficult issue to overcome.


This is a great part It made wiring
the trailer very easy. It fit underneath the gooseneck and mounted up real nice. I recommend it to anyone that needs to rewire their trailer.


Great all in one unit


I just finished mounting this to my trailer frame and it really seems to be a top notch product. It's so much cleaner looking and sealed connections.


I took delivery today and installed it onto the body of my slide in camper immediately. Installation was simple and effective. There's multiple slots for every applications. Everything works great.


Absolute Garbage!!! Why would they not follow the 7 pin color code?? Red is reverse, green is running, brown is left blinker, yellow is right blinker??? Why would etrailer sell this garbage?


STOP!!! Wiring colors are non-standard.

wiring colors do not match the standard. All of the colors are there, they are just rearranged. I hooked it up thinking that it was a color to color matchup like EVERY other product for 7-pin connectors and now I have to replace a special $xx fuse in my truck that I cannot get for 2 days. Not to mention the troubleshooting time.

There are standards for a reason, the products that you sell should adhere to them, or be clearly marked that they DO NOT. Simply listing the colors and hoping that someone notices they're wrong when they're ordering is insufficient.

I have 7 trailers and all of them follow the standard, except this one now.


Excellent product one more step to simplify our trailer building process


Paul was Fantastic !!! Great customer service !!


Cord was excellent. I was concerned about the wiring of the plug, but the wiring was completely compatible with my 2015 Ford Expedition and Airstream Trailer. (Yellow auxiliary center wire) No changing around of colors on the wire ends. Great!! It would be nice if Etrailer also sold this cord without the box, as I have a great box inside the Airstream for wiring, and had to remove the box to run the cord through the frame tube. But, for the price of the entire product, the box was really a nice "gift" for those who need it. Thanks, Etrailer.

Dale S.


It was very well made and we have had NO problems with it. Thanks.


Can you provide a pin out / wire color vs location on the 7 way plug Epicord 7-Way Molded Trailer Plug with Junction Box - 10' Long - 277-000141 I ordered. I'm seeing several installs where the wire color on this plug dose NOT match standard trailer wire color. Also it did not come with any paper work or instructions stating this. Example yellow is standard trailer for left turn. This 7 way plug looks to maybe use yellow for aux power going by other install photos and research.

This will be a major set back as my trailer has already been compleated and went by standard trailer wire color. ?????

Etrailer Expert

Mike L.


There is more than one accepted color code/wiring convention for a 7-way trailer connector. The color code for the Epicord 7-way plug/junction box is as follows: °White ground: 10 gauge °Black 12V power: 10 gauge °Yellow reverseauxiliary: 14 gauge °Red left turn and stop: 14 gauge °Green tail and running lights: 14 gauge °Brown right turn and stop: 14 gauge °Blue brake: 12 gauge. This is shown on the product description page on our website.


Very happy with this product. I'm looking forward to installing it on my trailer. Very solid and well made.


This new cable and distribution box will make the wiring job quick and easy. Trailer previously had a 4-wire system (no brakes) and was not up to current standards for lighting, so I'm replacing everything electrical and adding the brakes. This will help immensely.



This project turned out great! I really like buying from etrailer. They always have what I need, along with great customer service and fast shipping.


Love the 7 way barrel plug! Was easy to mount the junction box and connect the correct wires to the terminals once ring lugs were attached to the wires. Great light/brake trailer system cable and box!!!


Will M.





Show More Reviews

See what our Experts say about this Epicord Accessories and Parts

  • Can I Use My 7-Way Truck Wiring To Wire My Lance Camper Harness To My 2018 Ram 3500
    I found the owner's manual for your 2019 Lance 850 and it does recommend to use 8 gauge wire with their proprietary connector. Using the 8 gauge wire from truck battery to the camper ensures you have adequate amperage to the accessories in your camper. Since the vehicle's current wiring for the 7-way is not 8 gauge wire I do not recommend splicing into that wiring to install the camper's plug onto the vehicle. I recommend wiring the Lance vehicle plug into the truck separately or take...
    view full answer...
  • Dimensions of Junction Box of Epicord 7-Way Molded Trailer Plug with Junction Box 277-000141
    The width of the junction box of the # 277-000141 is 3-1/4 inches, the height is 2-1/4 inches and the length is 7 inches.
    view full answer...
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  • Wire Gauge to Use With Epicord 7-Way Molded Trailer Plug
    The Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 does have 12 gauge wire, which is appropriate. It can also be 10 gauge, however; either would be fine. I've added a pair of links to video reviews of this product for you to take a look at.
    view full answer...
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  • Where Is the Epicord 7-Way Molded Trailer Plug with Junction Box Made
    The Epicord 7-Way Molded Trailer Plug with Junction Box part # 277-000141 is made overseas which is the case for the vast majority of electrical products. I don't have any USA options but the Epicord 7-Way Molded Trailer Plug with Junction Box is still made with quality parts and will last a long time.
    view full answer...
  • Wire Color Match to 4-Way Wiring with Epicord 7-Way Molded Trailer Plug 277-000141
    Yes, you are correct about the install of the # 277-000141. The wiring colors you mentioned are correct except the blue wire is for brake output from a brake controller. You would want to run the black wire for both the lighting and a 12 volt auxiliary. Unless you wanted to run the same circuit on your tow vehicle up to the battery as well. The yellow wire you mentioned is reverse light typically.
    view full answer...
  • Troubleshooting Trailer Brake Actuator Activating When Vehicle is Put in Reverse
    You must have a short between the reverse light circuit and the brake output if when you put the vehicle in reverse the brakes come on. Since the reverse light circuit is normally the center pin it's pretty easy for it to potentially short to circuits. Check the condition of the wiring connections you made and clean up any obvious shorts you find.
    view full answer...
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  • Troubleshooting Brake Controller Showing No Connection When Attached to Horse Trailer
    First thing to try is cleaning the pins on the 7-way connectors. Typically a bit of corrosion will cause the circuits to not function or a brake controller to show "NO CONNECTION" like you listed. I'd try that first and if that does not work you can try rewiring the 7-way using the picture I attached as a guide. I also attached a coupler help articles for you to check out as well.
    view full answer...
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  • What is Yellow Post of Epicord Junction Box and 12 Volt Accessory Circuit Used For
    The yellow pin of the part # 277-000141 that you referenced is normally used for the reverse light circuit. This is typically used for reverse lights on the trailer or for a reverse lockout solenoid for if the trailer has surge brakes. The 12 volt accessory circuit (black) can be used for a variety of things. Most common is a breakaway battery charge circuit or interior/exterior lighting. I attached a review video for you to check out as well.
    view full answer...
  • Does 4-Way Trailer Wiring Circuit Need to Wire to Trailer Battery
    You don't need to connect the trailer wiring to the battery at all if your plan is to charge it separately. The 4-way can take care of the trailer lighting and then your battery and it's wiring can then take care of whatever circuits you are looking to power.
    view full answer...
  • How To Replace 7-Way On Trailer and Wiring Harness
    In order to replace the trailer connector on a trailer with brakes you'll first start with the lead. Then, you'll add a junction box. The Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector part # 277-000141 is what I recommend because it combined the above two parts for you already. If any of the wires going from the signals and brakes are damaged you can simply run new wires using primary wire or if they are still in good shape you can reuse them and just tie into...
    view full answer...
  • Where to Connect Trailer Running & Side Marker Lights to Epicord 7-Way Junction Box 277-000141
    On the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 the post that should be used to connect running lights and marker lights is the green one that has the green wire attached. Here is the complete wire/function/wire gauge configuration for this item: White (ground): 10 gauge Black (12V power): 10 gauge Yellow (reverse/auxiliary): 14 gauge Red (left turn and stop): 14 gauge Green (tail and running lights): 14 gauge Brown (right turn and stop): 14 gauge Blue (brake):...
    view full answer...
  • Troubleshooting Horse Trailer Wiring Where Brakes Lock Up Immediately
    Horse trailer wiring is funny as there's two different ways the standard 6-ways can be wired with the only real difference being the brake output circuit and the 12 volt accessory circuit being swapped. What would have solved your problem initially is if you had swapped those two circuits on your Dodge Ram 6-way initially before messing with the other circuits. If you check out the picture I attached it would be swapping the blue and black wires.
    view full answer...
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  • How To Convert a Trailer From a 4-Way to a 7-Way Trailer Connector
    In order to convert a trailer from a four way flat to a seven way round I recommend using the Trailer Wiring 7-Way Upgrade Kit part # 277-000141. It comes partially pre-assembled along with the rest of the components you need to make the switch. The only thing you need to do is cut off the old trailer connector and then attach these wire leads to the junction box.
    view full answer...
  • Wiring Color to Function For Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141
    The Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 has the wiring set for the following functions. White-ground Black-12V power Yellow-reverse/auxiliary Red-left turn and stop Green-tail and running lights Brown-right turn and stop Blue-brake
    view full answer...
  • Wire Functions of Epicord 7-Way Molded Trailer Plug with Junction Box
    Though there is not a diagram available I will list for you the functions of the wires in the junction box of the Epicord # 277-000141. White = Ground Black = 12V power Yellow = Reverse or Auxiliary Red = Left turn and Stop Green = Tail and Running Lights Brown = Right Turn and Stop Blue = Brake
    view full answer...
  • How to Wire New 7 Way Trailer Connector With Junction Box
    Long story short, you can wire your brakes and 12v auxiliary charge line into the junction box on the Epicord 7 Way # 277-000141 and continue to use the 4 way connector. With that being said, there is a much cleaner and more practical way to do this. You can start by cutting off the 4 way connector on your trailer and then wiring those wires into the junction box on the Epicord. Once you've wired those in, you'll run the brake wires from your trailer brakes into the junction box, as well...
    view full answer...
    Image 1 for
  • How to Convert M105A2 Cargo Trailer from Air-Over-Hydraulic Brakes to EOH or Electric Drums
    You can use your Parkhurst M105A2 military cargo trailer with your Silverado by converting its air-over-hydraulic (AOH) braking system to either electric-over-hydraulic (EOH) or electric drum brakes. Both options would allow the trailer brake controller in your Silverado to activate the trailer's brakes. The simpler and lower cost option is electric drum brakes since these require no hydraulic lines, just fairly simple electrical wiring and installation of a junction box like # 277-000141. You...
    view full answer...
  • What Amp Circuit Protection Usually Protects Brake Output Circuit for Trailer Brake Controller
    When installing junction box like the etrailer part # e99011 that you referenced you do not need to install a fuse on the trailer wiring but if you were asking about on the vehicle side the brake output circuit is typically protected by a 30 amp fuse or breaker.
    view full answer...
  • 7-Way for 1886 Lance Squire Camper to Replace 4-Way
    A 4-way round connector that attaches to a charge circuit is not a standard 4-way wiring at this time. We won't have a way to create 7-way to 4-way that attaches to the charge circuit. I know you don't want to rewire it but I think going to a 7-way setup on camper is going to be your best option like with the part # 277-000141.
    view full answer...
  • Wire Gauge Sizes in Epicord 7-Way Molded Trailer Plug with Junction Box
    The wire gauges in the Epicord 7-Way Molded Trailer Plug with Junction Box # 277-000141 are as follows: White = 10 Black = 10 Yellow = 14 Green = 14 Red = 14 Brown = 14 Blue = 12 The wire gauge in the Epicord # 277-000141 changes with different functions of the wires. Signal wires, like yellow, green, red, and brown, draw less amperage so they use a lighter gauge wire. Heavier gauge wire is used for functions like the brake signal, ground, and 12V power because they carry higher amperage...
    view full answer...
  • Availability of 7-Way Wired to Junction Box
    We do have that actually. You would want the Epicord 7-Way and Junction Box part # 277-000141 which is a 7-way with 10 feet of wiring that leads to a junction box.
    view full answer...
  • How to Power Trailer Interior Lamps Using Shore Power
    Assuming the lamps in your trailer are 12-volt, you'll need a bench-top type 12-volt power supply which you can easily find online. You'd also need a 7-way socket and pigtail like # 20024. If you choose a power supply with screw terminals on the front of it, the black pigtail wire would connect to the positive terminal and the white pigtail wire to the negative (this assumes that the lamps are powered from the 12-volt circuit from your trailer connector, sometimes they're powered by the...
    view full answer...
  • Replacing Molded 7-Way, Junction Box, and Breakaway Kit on Trailer
    If you have a 7-Way and junction box setup on your the trailer your easiest route will be to just replace the junction box with something like the Epicord 7-Way # 277-000141. This harness features a 7-Way molded plug and pre-wired junction box with terminals so that you can simply make connections to what remains of your trailer wiring after removing the connector. I have attached an installation video so you can see exactly how everything hooks up. The wire color/functions for the harness...
    view full answer...
  • Is Continuity from Running Lights or Brakes to Ground Normal When Installing a Junction Box
    Yes, the continuity you are seeing after connecting your wiring to your junction box, like part # 277-000141, is normal. The only way that you wouldn't get continuity is if there was a break in the circuit somewhere. If you have your tow vehicle handy you can also test your wiring by simply connecting the 7-Way from your junction box to the 7-Way on your vehicle. You can then run through each light function to make sure your lights are working properly and use the manual override on your...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Jacob T
Video by:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B
Employee Mary K
Written by:
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Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
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