bing tracking image
  1. Accessories and Parts
  2. Buyers Products
  3. Trailer Wiring
  4. Junction Box
Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS

Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS

Item # 3375601101
Our Price: $16.34
You Save: 78%
Accessories and Parts
Shipping Weight: 0.7 lbs
Add to cart
In Stock
Buyers Products Accessories and Parts - 3375601101
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Color coded terminals in the ABS box provides a fast, easy way to connect the wires from the trailer connector to the wiring for either a 6-way or 7-way connector. Makes replacing your trailer's connector simple. 1-800-940-8924 to order Buyers Products accessories and parts part number 3375601101 or order online at Free expert support on all Buyers Products products. Great prices and Fastest Shipping for Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (355)
  • Q & A (0)
  • Videos (2)
  • Photos

Buyers Products Accessories and Parts - 3375601101

  • Trailer Wiring
  • Junction Box
  • Buyers Products

Color coded terminals in the ABS box provides a fast, easy way to connect the wires from the trailer connector to the wiring for either a 6-way or 7-way connector. Makes replacing your trailer's connector simple.

  • Electrical junction box consolidates your truck's wiring
  • Color-coded terminals help you stay organized
  • ABS construction
  • Number of terminals: 7
  • 1-Year warranty

5601101 Buyers Products Electrical Junction Box - 7 Color Coded Terminals - ABS

Video of Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS

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

Video Transcript for Buyers Products 7 Color Coded Terminal Trailer Wiring Junction Box Review

Hi everyone. Adam with Today we're going to be taking a look at the Buyers Products seven pole trailer junction box. So this is going to be a really organized way to get all of your wiring from your seven pole of your vehicle tied up to the right function of the wiring of your trailer. This is going to do a couple of things, keep everything organized, keep it all dry because it does have a cap, but also a lot of the times we don't get trailers that configure with the standard seven pole color wiring. Luckily we lucked out and we can do basically color to color, but it's not always the case.

What's nice about this junction box is it is pre colored. Each stud is going to have the color and it does have stated green in text and also what that function will be on the other side.So it gives you a color cue and also a word cue to let you know how to wire this thing up. So when comparing this to some of the other junction boxes we carry at if you're starting from scratch, etrailer does make a kit that comes with a seven pole and a junction box and much more. Also we do have a Pollack brand that comes with a 10 function. So if you have a little bit more use for a couple more terminals here, definitely go ahead and grab one of those.It does look pretty difficult, but honestly it really isn't.

You just got to test your wires. So let's just go ahead and do all that together. So we're going to go ahead and check out our trailer's functions and you can either use a test box or just hook up your vehicle. So what we've got to do is I'm going to grab ground from my white wire here. You can also just ground it to the chassis of your trailer.

With my test box I'm going to be testing the right blinker. Ours is color to color, so brown should be the right one.So you can repeat that same exact process for all the wires. Just remember match it to function, not color. Now that we have all this wiring sorted out and we know every single wire and what it does, now we can go ahead and take our junction box. You kind of want to get an idea of where you want to mount it.

I think I'm going to mount it right here. You want to make sure you can get that cap on and you'll be able to tap in from the sides. Before we do all that, what we're going to do is I'm actually planning on using these two sides here to run our wires in and as you can see there's no holes.So in our kit that comes with the junction box we are going to get replacements that will have holes in them. So since I'm using these, I'm just going to take this out put it back in the box and these are going to eventually seat into the slot there. What I'm going to do to make it a little bit easier on myself. I'm actually going to fish these wires through first. So I'm going to to do the same exact thing for our wiring going to our trailer. Once that's done, I'm actually going to start with the wiring that comes from our vehicle and basically all we got to do is just put it into the slot like so. We're going to have to undo these screws right here. Take that off, put it in there.We might have to avoid these little brown plastic pieces here. That's going to be what's going to secure our lid into place. Then fasten it down. Once you think you're done, give it a good wiggle and make sure it's nice and tight. These ring terminals does not come with the kit. We do sell them here, so if you don't have any in your garage or anything, definitely go and pick those up whenever you grab one of these. Always make sure you've got a good connection and obviously have enough length to meet it to the right function.So I'm just going to put this nut on there pretty loosely just so it's not flopping around. I'm going to go ahead and put some ring terminals on all of our wires. For now I'm just going to match them up color for color on our junction box. So as you can see here, we just finished our vehicle wiring here and we're going to basically do the same exact thing for our trailer wiring. We're going to put this into place, but I got to undo these two screws first. Then we're going to go ahead, put those back, and screw them down evenly.So now we can just go ahead and put some ring terminals on all these wires and we're probably going to have to cut them and strip them back a little bit so they can fit into our junction box. So we've got all of our ring terminals on here and this side over here is going to be all of our trailer wiring. Over here is going to be from our vehicle. What we're going to do is as we put from our vehicle, all these wires have a specific function. So you don't necessarily need to go by the color because a lot of the times these trailer wirings aren't going to be color to color. So you could do it one at a time and test each and make sure that you're matching them up function by function. Let's take this nut off, place it on there.Tuck those wires away a little bit and put that nut back on. We are going to come through here with the tool to tighten these up. So now that everything is hooked up, now's a great time to test everything out and make sure everything's hooked up correctly. We're going to use the test box, but you can also just use your car. All right, so first we're going to start with our taillights.Our left turn signal, our brake lights, and our right turn signals. So now is going to be the time to mount it in its home. I want to angle it like so and we're going to run some cell tappers through this plate. One thing to note these cell tappers are not included with our kit. So once that's secured into place, give it a good wiggle, and make sure it doesn't go nowhere, and then we can go ahead and put our cap on. It doesn't really matter which way because these are going to line up regardless. Then we can take our screws and these we're included with our kit, slide on in there. Use the Phillips head tighten them down. Well everyone that's going to do it for our look at the Buyers Products seven pole trailer junction box.

Customer Satisfaction Score:

Customer Reviews

Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS - 3375601101

Average Customer Rating:  4.7 out of 5 stars   (355 Customer Reviews)

Color coded terminals in the ABS box provides a fast, easy way to connect the wires from the trailer connector to the wiring for either a 6-way or 7-way connector. Makes replacing your trailer's connector simple.


Your connector box is a great product, easy to install each wire by color and number. I had a shorter than I expectd new harness and plug but the box made it eazy to place where I needed it instead of going into the trailer understructure. I placed the box between the traile tung under the battery box for easy future acccess. I hand made a sheet metal shield for extra water proofing.
I reccomend this product, easy peasey.


I have a 2019 Forest River travel trailer. I started having brake problems and the dealer was no help so since i have some experience I started looking at the issue myself. What i found was a series of loose and poor 12v connections throughout the braking system and some in the lights as well. The main culprit was connections in the main junction box, see pictures. The factory used a household style jbox and not a quality sealed jbox. I looked on line to fInd a suitable solution that allowed easy access and easy installation. This product fit the bill Perfectly. After a couple hours work to remove the old box and install the new one (in new location) cut and install proper ends on all the wires and make clean secure connections my trailer now has brakes that work properly. The new box came with all necessary screws, nuts and has plenty of wiring install point options. It is all plastic so i was careful not to over tighten any of the screws used to retain the harnesses on each end of the box.
Thank you for a great product.
Gunter, TX
Happy Camper


Nice part, makes an excellent junction block from pigtail to trailer wiring


Replacement a previous box. Great



Works out well, they hold up here about 2-3 years before needing replacement due to the sun.


Worked great! Eliminated the butt connectors and electrical tape and secured everything inside the tongue frame for a clean and secure wiring harness.


The product did exactly what was advertised which is what I needed. The shipping was prompt and quick. I have used before and will use them again.



The products continue to do their job flawlessly.


Strong plastic with plenty of room and included grommets to connect new trailer plug to trailer wiring.


The Trailer wiring Junction Box has cleaned up the new wiring I installed. I now can go to one spot to check for any wiring problems. It was easy to install and had everything included to protect the wires.

Richard M.


It is working great. In fact I will need a couple more for the 2 trailers my Brother-in-law has.


Well built, lots of options for wire routing. My only wish would be that it should be stainless hardware.


Box already leaks water and it broke upon installation


Excellent product, well made and sturdy.
Color coded anchor bolts to secure your 7pin connections with the wiring of your trailer to match up appropriately with assigned functions from your vehicle’s harness. Which is all standard!
Gasket sealed to help protect connections if attached outside exposed to the elements.
Extra sleeves provided in case your wire harness is slimmer in diameter or wished to seal proof the junction box.
Can’t express enough how easy, convenient, and the quality of this product has been from install and to this point in time.
Over a year in my trailer, and looks just as good as the day I put it in.
It is made of thicker plastic, built to last, and has held up with no deformation of any kind within my enclosed trailer in the Texas heat.
Im sure my trailer, being black, and enclosed, bakes over 160 degrees in there.......if not over or near 200 degrees.
Yet plastic is still good and not brittle, and like I no different than the day I put it in.
I bought it to rewire my whole trailer and to include reverse lights and electric brakes. Original wiring was complete BS and had splicers, which caused intermittent working lights and shorts.
I gutted and rewired the whole thing with thicker gauge wiring, heat shrink connections with heat shrink tubing over that, and any possible friction points I wrapped with tape and put heat shrink tubing over that.
Needless to say, the color coded connections within the junction box made my life so much easier.
Not to mention the thought process that went into the design of this junction box for a clean install no matter where you decide to mount it was a God Sent!

You wont regret this purchase!

I’ll quote Chef Paul Prudhomme on this one,......
“ I Guarantee!”


This was fantastic for my utility trailer. Made wiring everything super easy! For my small trailer I have led brake lights, side blinkers and I also had a 3rd brake light. There was still room so I put a female trailer plug just long enough to hang out of the box. That way I can connect a 'trailer light tester' and have an idea where potential shorts might be. ;-)


Product works as described. etrailer has been excellent to work with.


I like working with you guys. Availability is great, and quick shipping.


Down a star for the wire clamps and the crappy super soft screws that hold them in. Rest of it is great.


It worked perfect for all the trailer w iring.


This junction worked perfectly! So handy to have under your vehicle to wire up a wide variety of accessories! I used it to wire up flush mount pod lights that I installed in the rear bumper. They serve as reverse lights and they’re also wired to come on with a switch. Very handy!


I have purchased several of these and they are already way to connect the trailer lights to whatever vehicle configuration you choose.


Before I even get home to get my mail "Carol C" is already begging for praise. If you have to fish for reviews, i wonder if i should just return your junk


Excellent product to make the transition from trailer wiring to pigtail for vehicle. Makes for clean changing of pigtail.


Nice junction box. Item found to be as described.


yes i like them easy to install and color coded really nice


This junction box does the trick. However, the plastic on the sides is just a little thin when the lid is not on. After securing the lid the box is quite strong.


As with everything I have ever bought over the last 10 years from etrailer, never question the quality and service,they have always been there with great tech advice, fast shipping, and fair pricing.


Excellent product. I have ordered this product many times over the years, and have never had any problems with it.

Show More Reviews

See what our Experts say about this Buyers Products Accessories and Parts

  • Dimensions for Buyers Product Wiring Junction Box # 3375601101
    The Buyers Products Trailer Wiring Junction Box # 3375601101 referenced in your question measures 6.5 inches long, 3.21 inches wide, and 2.5 inches tall when the cover is installed. The mounting holes at each end are spaced apart 7.38 inches on center. I have attached an image to assist.
    view full answer...
    Image 1 for
  • Does Junction Box 3375601100 Have O-Ring Seal Built Into It
    The lid of the Junction Box part # 3375601101 that you referenced does not have an O-ring or seal built into it. The lid has a pretty deep channel though that fits to the base of the box well enough that it does a decent enough job keeping moisture out. Since the holes on the sides are big enough to allow the wires to go through them it wouldn't do much to make the lid water tight.
    view full answer...
  • What Size Thread/Nut Does Buyers Products Junction Box # 3375601101
    The size of the nuts that fit the posts of the Trailer Wiring Junction Box # 3375601101 is M5-.8 pitch. This does not come with extra nuts.
    view full answer...
  • Can a Junction Box on a Trailer Short Out?
    Junction boxes like # 3375601101 have independent terminals for each function that don't connect to each other. It would be very possible for a connection to go bad or lose connection, but it is not normal for an entire junction box with all its functions to go bad. I've attached a trailer wiring diagram to assist. It sounds like you may have lost multiple functions, so I recommend checking your ground connection as that could absolutely impact multiple functions and then check vehicle...
    view full answer...
  • Is Black Terminal for Trailer Wiring Junction Box Used for Reverse Light Circuit
    When connecting wiring to the Trailer Wiring Junction Box # 3375601101 you can actually make whichever terminal connect to whatever function you'd like. Typically the color black is used for 12V power when it comes to trailer wiring but if you wanted to use that terminal for the reverse light circuit it would still work, you'd just have to remember to connect the reverse wire from your trailer 7-Way to that same terminal.
    view full answer...
  • Can I Use Wiring Junction Box part # 3375601101 On A Boat Trailer
    The Trailer Wiring Junction Box part # 3375601101 is not designed for a marine application unless you keep the junction box as far away from the the water as possible. If you mount the box on the tongue and it doesn't get backed into the water when launch the boat then you should be okay. There may be boxes out there made for marine applications but we do not carry them at this time.
    view full answer...
  • Troubleshooting A Bad Ground With Boat Trailer Lights
    Yes, you will need to remove the paint in order get a better ground connection for your trailer's lights. This is a super common issue that we see and you nailed it with the solution you described. A lot of the time the aluminum is usedfor boat trailers, which isn't very conductive and won't offer a good ground, but since you said it's painted it leads me to believe that it should be steel. That being said, it could be some mix of metals and just might not be as conductive as you're needing...
    view full answer...
  • Can An A-Frame Trailer Jack Be Wired To The 7-Pole Cable
    Yes, it is possible to wire your Stromberg Carlson Electric Trailer Jack # JET-3555 into the 7-way. There isn't much room inside of the 7-pole plug so the easiest way to power your jack from the 7-pole would be to wire it to the 12v power in your trailer's junction box. If you follow the 7-way cable along the frame of the trailer you'll see some sort of box where the wires from the cable will run and connect to the wires for your trailer's lighting and brakes. A lot of the trailers that...
    view full answer...
  • How to Wire a Trailer with Electric Brakes
    Those are the wires for the brake magnets. You will need to connect the black wire to the brake controller output wire on your trailer connector and you are correct the white wire will need to be grounded to a clean metal surface on the trailer. I have linked a diagram for you. The brakes get their power from the brake controller. It sends a signal to the magnet in the brakes to engage and that initiates the braking action. Since you already have a new 7-way connector for your trailer I...
    view full answer...
    Image 1 for
  • Replacement Junction Box for etrailer 7-Way Upgrade Junction Box Kit
    I wonder if the box was stressed in some way when bolting it to the trailer. Maybe one of the install bolts was pulled the box in a direction that stressed it. That said, for just the box you'd want the part # 3375601101 which is an exact replacement for what comes with the # e99011.
    view full answer...
  • What Size Ring Terminals Should be Used with Buyers Products Junction Box # 3375601101
    The ring terminal size you need for the posts of the junction box part # 3375601101 that you referenced is 3/16 inch like the part # 44-5310A which would work great. The terminal matches the correct ring size and also is designed for 10 to 12 gauge wire.
    view full answer...
  • How To Charge Your Breakaway Switch Battery On Your Trailer
    The Bright Way Trailer Brakeaway Kit # 3802308 has a built in 1-AMP charger. So when your truck is connected it will be charging. There should be no draw going out while the trailer is disconnected so it should be ready to rip whenever you're ready to haul. I recommend wiring it up using a junction box # 3375601101. I've included two videos for you to watch to see how I set up our enclosed trailer at our shop.
    view full answer...
  • Troubleshooting Trailer Brakes Locking Up When Connecting 7-Way To Tow Vehicle
    It does sound like there is either something not wired correctly or you have a short in the wiring which is causing the trailer brakes to activate and lock up. There is also the possibility of having an issue with the trailer breakaway switch If the pin is missing, broken or damaged internally connecting your vehicle could provide power to the breakaway switch which activates the brakes. I recommend starting by checking the condition of the wiring along the 7-way and also check inside...
    view full answer...
  • Option For Connecting a Lance Camper Electrical Plug To A 2020 Ford F 450
    We do have a potential solution for you, but Lance campers use a proprietary plug, and there is not any adapter for your Lance camper that we are aware of. If your camper does use the proprietary lance plug, we recommend replacing it with a 7 way plug like the Hopkins 7-Way Blade Style Connector with Molded Cable # HM20041. This way you can simply plug in to the 7 way plug on your F450. We also recommend running your connections thru a junction box # 3375601101
    view full answer...
  • Parts Needed to Replace Trailer Connector on 2018 Rockwood A122s Pop Up Camper
    I have a solution for you, but there is not a "plug and play" type wiring solution available for this so you would need to cut your existing wires. Once you've done that, you can use the etrailer # e99011 which has a 5 foot long cord and comes with a junction box already attached. If you wanted to go with something slightly shorter, like the # 277-000143 that you were looking at, you can use that 7 way and add the Junction Box # 3375601101 to complete the wiring on your 2018 Rockwood...
    view full answer...
  • How To Wire In The Hopkins 7-Way Molded Trailer Wire Connector
    I've attached a wiring diagram for the 7-Way Molded Trailer Wire Connector # H20044, however there is no guide available to tell us the wire color functions on the trailer so you'll have to test each wire in order to determine its function. If your current plug is still functioning then I recommend connecting to your vehicle and going through each function and testing the wires for power with a circuit tester # PTW2993 at the junction box of the trailer. Having replaced quite a few 7-pole...
    view full answer...
    Image 1 for
  • Recommended Durable 7-way Trailer Connector Pigtail
    Hopkins does a very good job of constructing their molded 7-way trailer connector pigtails for durability, I can highly recommend part # H20044, which is 6 feet long. The best way to connect this to existing wiring is to use a junction box like # 3375601101. A junction box allows you to tidy up the connections, protect them from the elements and provides an easy way to change out the pigtail in the future should it become damaged again. One of the best ways to preserve the long term functionality...
    view full answer...
  • Parts Needed To Transfer A Boat Trailer With Surge Brakes To Electric Over Hydraulic
    Since you already have a hydraulic surge brake system on your trailer it's going to be fairly easy to swap over to an electric over hydraulic system. Starting with the trailer coupler, you'll want to lockout the actuator, if possible, or replace it with a standard trailer coupler. If you need to swap out the coupler I'd just need to know the size of the channel the current one is mounted on and the GVWR of the trailer to determine the correct capacity coupler. You'll remove the brake...
    view full answer...
  • Recommended Tire Pressure Monitoring System For 2 Trailers
    Installing the signal booster that comes with the TireMinder Smart TPMS for RVs # TPMS-APP-6 will either require you to connect it to a battery or the 12 volt source on your 7 Way trailer wire. Most batteries on a trailer with electric brakes are designated for the break away system though and I do not recommend tapping into it. You want that at a full charge at all times so it can do the job it is there to do. I recommend hooking it up to the 12 volt source so it will only get power when...
    view full answer...
  • How Do I connect My Trailer With A 5-Flat To my Vehicle With A 7-Round Plug
    We have exactly what you are looking for. I recommend using the Optronics adapter # A75TB. This will plug in to your trucks 7 way and allow you to plug the 5 flat into the other end. This will allow the electric lockout on your brake actuator to function normally. You could also think about rewiring the trailer with a 7 way plug like part # H20046. This would be fairly easy to replace and would eliminate the need for any type of adapter. If you do re wire the trailer it is recommended...
    view full answer...
  • 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...
    view full answer...
  • What Gauge are the Internal Wires of the Roadmaster RM-1064-B
    I spoke to Roadmaster and they said all 4 internal wires of the # RM-1064-B are 12 gauge jacketed wire. Depending on what you will be doing with this wire, the following parts may also be good options for add on parts as well. The Pollak Heavy Duty 4 Pole Round Trailer End # PK11402 would attach to the end of the # RM-1064-B very nicely. This would then pair with the Pollak Heavy Duty 4 Pole Round Vehicle End # PK11404. The # RM-1064-B would then attach to a junction box on the trailer,...
    view full answer...
  • Replacement Axles and Brakes for 2007 Venture VATB
    To find the replacement parts you need you will have to identify what you have now. Based on the 14,625 lb GVWR you likely have 4,400 or 5,200 lb axles on the trailer. You will need to check your axle tag to verify this information. You will also need to know your hub face to hub face measurement for a replacement. See the video below which shows how to measure. Once you have this information we will be able to see what replacement parts are available. For example, if you have an 89" long...
    view full answer...
  • Can A Winch Battery And Trailer Breakaway Battery Both Be Charged Through 7-Way 12v Hot Lead
    You would be able to charge both the trailer battery as well as the breakaway battery through your 7-way connection to the tow vehicle. This is very standard practice with most people just running a line from each battery to the 12v accessory terminal in the junction box # 3375601101. A 7-way on a vehicle is typically rated for 40amps DC so you won't be getting much going to the batteries once everything is divided up to power any other accessories tied into the circuit so this would be...
    view full answer...

< Previous

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Robert C
Installed by:
Robert C
Employee Adam E
Installed by:
Adam E
Employee Chris R
Video by:
Chris R
Employee Jonathan Y
Video by:
Jonathan Y
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924