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

Trailer Wiring Junction Box - 7 Terminals - Polypropylene

Item # 3375601100
Our Price: $13.90
Accessories and Parts
Add to cart
In Stock
Buyers Products Trailer Wiring - 3375601100
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
Durable polypropylene box creates 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 3375601100 or order online at etrailer.com. Free expert support on all Buyers Products products. Great prices and Fastest Shipping for Trailer Wiring Junction Box - 7 Terminals - Polypropylene. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (212)
  • Q & A (0)
  • Videos (2)
  • Photos

Buyers Products Accessories and Parts - 3375601100

  • Trailer Wiring
  • Junction Box
  • Buyers Products

Durable polypropylene box creates 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
  • Polypropylene construction
  • Number of terminals: 7
  • 1-Year warranty

5601100 Buyers Products Electrical Junction Box - 7 Terminals - Polypropylene





Video of Trailer Wiring Junction Box - 7 Terminals - Polypropylene

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




Video Transcript for Buyers Products Trailer Wiring Junction Box Review

Shane: Hi, I'm Shane with etrailer.com. Today, we're going to be going over the junction box for trailer wiring. This box is going to be a polypropylene box, very durable plastic. It's made to be mounted on the frame of your trailer. And what this does, this allows you to wire your 7-pole plug separate from your trailer wiring. So, say we have our 7-pole wiring, it comes loose, drags the ground, or gets damaged.

We're not going to have to cut it off of our wiring coming from our trailer in order to replace the plug. We can simply take it off of the pegs here, replace our plug, and add new ring terminals, stick it right back in the box and connect it directly to our wiring.And with a trailer this size, or larger trailers, if you maybe want to add a breakaway switch, it's very easy to run that wire over and connect it directly on to the brake wire coming off the 7-pole plug, without having to cut the wire coming out of there and splice them together. Depending on how your trailer is set up and how your 7-pole plug wiring is done, it's going to have to be tested. Your box is going to come with a sheet inside, it's going to look like this, on how it has to be set up.However, this is not always accurate with the plug itself. If you have the 7-pole plug, it may be wired just a little bit different than this.

Trailer wiring needs to match whatever the functions are coming off of your 7-pole plug coming from the vehicle. You're going to have a power wire coming in. You're also going to have ground. The ground coming off the center post needs to be grounded to the frame. So you're not only grounding the 7-pole plug, but you're also grounding this setup here on the box.The box is going to come with five rubber knockouts.

You can either cut these or they will also come with another set that already has a hole already open. I, myself, just like to cut an X in it and run my wires through it, it kind of helps it seal a little bit better. These will seal underneath the lid. Each place that your wire comes in, you're also going to have a metal clamp with two screws, and that's to hold your wiring in place to keep it from coming out. The lid you can see here, it's got a groove, and what that does is it seals around this edge to keep any water or anything like that out.It's going to come with two large screws to hold your lid in place.

Again, I'm Shane with etrailer.com. That's going to do it for our look at the trailer wiring junction box..

Customer Satisfaction Score:


Customer Reviews

Trailer Wiring Junction Box - 7 Terminals - Polypropylene - 3375601100

Average Customer Rating:  4.7 out of 5 stars   (212 Customer Reviews)

Durable polypropylene box creates 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.

by:

The junction box provides adequate room for wiring terminations and weatherproof covering of them. The harness for transmitting power to the trailer is of robust design with LED lights indicating proper power to the various end uses. A stainless steel u-bolt was used to secure the harness to the trailer frame and thereby eliminate stress on the junction box. Stainless steel machine screws were used to attach the Breakaway Battery Box to the trailer frame. A stainless steel quick connect will be used to secure the Breakaway switch to the vehicle. The red lead supplies 12 volt power to the Breakaway battery.



by:

All new wiring on a trailer rebuild. These junction boxes make the job so much easier and faster. Now when i troubleshoot wiring issues im chasing one wire at a time. Oh and now the wiring goes in a location that works for me



by:

This is the mechanism to rewire an elderly auto hauler, that has wiring faults.
Better to spend the $$ and do the job correctly, than faulty shortcuts. The old Junction mechanism is not viable. This should fit the bill.
Will comment further after the dasterdly deed has been done

Sandie

3/17/2024

Working like a champ. Completely satisfied.



by:

Nice junction box. Used this as a junction/access point for my ‘18 Equinox flat tow setup. It houses my 5way conductors for tail lights, the Roadmaster battery charge line circuit breaker and fuse lead to my accessory +12v port that I’ll plug my Brake system into. Also added a cut off toggle switch on the charge line when not in use.



by:

works great for my trailer.



by:

Doing business with Trailer is good.
Correct
product at a fair price.



by:

solved the nasty wire mess problems,, you have bolts to tie each ring terminal to...



by:

It worked out well. Better than trying to just splice on a new plug & cable.



by:

This is an excellent junction box.



by:

Great products delivered on time. Professionally packaged, not seen often.



by:

Works well, like the connections out of the weather



by:

Awesome piece of equipment!! EXACTLY what I was needing!! Replaced the old torn up box and this box worked perfect!! Fast shipping and great communication, as usual!! Thank you etrailer!!

Brianb

6/17/2020

One year later and the box is still holding up strong! Great product!



by:

Trailer sits outside 24/7, always bone dry inside. I put a little silicone around the rubber grommets for good measure.



by:

I have not installed yet, but the product arrived in good condition. There are lots of options for installation and lots of grommets for the wiring to access the terminals.



by:

The terminal box is handy little item to have when wiring a new 7 way plug on your trailer.



by:

Fast shipping and seems to be good qual ity



by:

All my trailer parts for a new build keep coming in from etrailer , my go to online store. Everything needed for building and maintaining trailer etrailer has. I have been dealing with etrailer for several years now and have never been disappointed.



by:

Great product. Glad to see it came with so many ways to install the tow vehicle cable and trailer wiring bundles. Also good to see two sizes of waterproof graumets to ensure best water tight conditions.



by:

Beside using these boxes on trailer tongues, they're also handy at the rear of trucks. Heavy duty trucks also use seven wires. Different plug, round pins. I've used similar boxes to tidy up the wiring on many big vehicles. These seem to be decent quality at a fair price. I got this one to add a trailer connection on a school bus converted to a camper. It was shipped promptly, UPS sat on it for a few days.

Chuck

1/31/2021

A year later, all is well.



by:

After a year doing its job well.



by:

Was exactly what I needed for adding electric brake axles to my boat trailer. I'm very happy with this product and with the service from etrailer.com.



by:

Just what I was looking for, needed to rewire my Army truck tail lights and this box fits a treat. and is the size that I can hide from the rivet counters. Thanks again and other items I have had from you in the past.

John B.

5/19/2020

Still working great!!need one for a new build coming up. Thanks E Trailer.



by:

I needed a trailer wiring junction box because my existing one rusted out. I looked all over, including the place where I bought the trailer, but was unsuccessful. I stumbled onto the etrailer site by luck and was amazed they had what I was looking for. I took some photos of my unit and compared it to what they were offering and it appeared pretty identical so I went ahead with the purchase. This company is very responsive and easy to deal with. The shipping was quick, the price was very fair, and the staff is attentive and professional. I’m glad I discovered etrailer.



by:

Perfect! Works like a champ, for years I've used plastic conduit and electrical tape, it never holds up and looks bad. This junction box made my trailer rebuilt project look professional!

Jon

7/25/2021

Great! Still water proof and working fine.



by:

My trailer's stock surge brakes worked pretty well but dragged the brakes driving down hills, did not work while backing down boat ramps, and provided no backup if my vehicle brakes failed... So I got this EOH system to solve those problems.

I only test-drove the finished upgrade once but it seemed to work fine. Note that in my 2018 Ram 1500 with integrated trailer brake control, I needed to set this up as "EOH heavy" even though my boat + trailer are under 6000 lbs.

I wanted a solid, clean install, so I had a bracket made and welded to the trailer out of harm's way and above the possible high water level, even though it's all theoretically waterproof.

Other considerations:
- I was able to re-route the stock steel brake line right to the brake unit.
- I had to buy a new 7 pin trailer harness to replace the stock 5 pin one. I made a conversion harness to go from the new wiring to the stock trailer wiring.
- I locked out the original surge system by replacing its guts (master cylinder, spring, etc) with a steel bar that goes between the front and rear pins.
- I hid the breakaway switch inside the tongue and ran the new breakaway cable where the original one went.
- I safety-wired the brake reservoir cap to prevent its loss or vandalism. It just didn't seem secure to me. Easy fix!

I think it looks good and seems to work well. I expect it will last many years. I gave it only 4 stars as the brakes have some lag (1/2 second?) before I can feel them working. I was led to believe the brakes would be instantaneous and I "would not feel the trailer" (possibly like the electric brakes on my other trailers) but it's not quite that perfect. But maybe I'm being picky! I'd choose this very system again.


25
213
Show More Reviews

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

  • Parts to Convert Surge Brakes to Electric Brakes on Boat Trailer With 3,500 lb Axles
    Thanks so much for that info, and we can get your boat trailer set up with electric brakes. Since you had an idler hub you will need a hub and drum for electric brakes, and with the bearing numbers you gave, that means you have 3,500 lb axles. That said, here is everything you'll need to make the conversion: - Trailer Hub and Drum Assembly - 3,500-lb Axles - 10" Diameter - 5 on 4-1/2 - Galvanized # AKHD-545-35-G-K - Electric Trailer Brake Kit - Self-Adjusting - 10" - Left and Right Hand...
    view full answer...
  • Should Junction Box be Used For Adding 7-Way & Wiring to Trailer
    For adding wiring and a 7-way to your trailer, a junction box and 7-way connector is absolutely the way to go, because it is the easiest way to connect your wiring. The best option for that is the following: - Junction Box - 7 Terminal # 3375601100 - 7-Way RV Style Connector - Trailer End 6 ' Long # HM20086 or 8' Long # H20046 If you need added components for install such as a wire tool, zip ties, circuit tester, butt connectors and more, you may want to consider getting that in one...
    view full answer...
  • Parts Needed to Re-Wire Trailer With 7-Way & Electric Brakes
    We can get you set up to re-wire your trailer with a 7-way, and while there isn't a complete kit, we do have everything you need, which I'll go ahead and list out for you. - Junction Box # 3375601100 - 7-Way Connector # H20046 - Ring Terminals # 44-5310A - Brake Wire (Sold by the Foot): 10 Gauge Primary Wire # 10-1-1 - Wires for Lights (Sold by the Foot): 14 Gauge Primary Wire # DW02412-1 - 12-10 Gauge Butt Connector # 05732-2 - 16-14 Gauge Butt Connector # DW05714 - Performance...
    view full answer...
  • Parts Needed to Add Electric Brakes to Tear Trailer With Dexter 008-258-05 Idler Hub
    Thanks for all that info, and we can get your trailer set up with electric brakes. You'll need a number of things, including a hub and drum to replace your Dexter 008-258-05 idler hub. I checked with Dexter and that hub uses bearings L44649, so to replace it, the hub/drum and electric brakes you'll need are the following: - Dexter Trailer Hub and Drum Assembly # 8-257-5UC3-EZ - Dexter Electric Trailer Brake Kit # 23-47-48 These brakes come with the mounting hardware but not the adjustment...
    view full answer...
  • Will The Trailer Wiring Junction Box # 3375601100 Allow For 2 Separate 7-Way Connectors?
    Yes, the Trailer Wiring Junction Box # 3375601100 will have enough room for both the 7-Way Blade # HM20041 and a EZ Connector # 319-S7-10.
    view full answer...
  • Rewiring Boat Trailer for 7-Way to Use LED Lights
    There are a number of things you will need if you want to re-wire your boat trailer to use LED lights and you should start with Junction Box # 3375601100 and 7-Way # HM20041. Keep in mind you will also need Ring Terminals # 44-5310A and Loom Clamps # A0500 For LED lights I highly recommend checking out the LED Trailer Tail Light # STL57RB (Driver's side) and # STL56RB (Passenger's side). These are submersible lights with a total of 40 diodes and have mounting holes that are 2" center to...
    view full answer...
    Image 1 for
  • How to Properly Wire Electric Winch and Trailer Jack on a 2019 Ford F-150
    Hey Santiago, to power your electric jack off of the 7-way and/or the battery I recommend installing the Trailer Wiring Junction Box # 3375601100 and connect your jack to the 12v circuit that your battery would also be connected to. This would allow your jack to draw power from both your tow vehicle's 7-way or your trailer's battery. To add a winch like # DL25220 you'd just need to run the leads from the winch to the battery on the vehicle.
    view full answer...
  • Parts Needed to Add Back Up Lights & 7-Way Connector on Boat Trailer
    We can get you set up to add back up lights and a 7-way to your boat trailer, and I'll go over what you'll need. Let's start with the back up lights, and for your boat trailer you'll want submersible lights like you said, the GloLight LED Backup Light for Truck or Trailer - Submersible # BUL111CFPG. This will use a 2-wire (power and ground) pigtail, either the Right Angle 2-Wire Pigtail # A49PB or 2-Wire Pigtail # A45CB. Then for added wire I recommend 16 Gauge # 16-1-1, which is sold...
    view full answer...
  • Replacement Trailer Side 7-Way Connector with Junction Box
    Sounds like you are missing your trailer connector. I have a couple options for you depending on how far back your wire was cut off. The first is the Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End item # PK12706. This is just the trailer connector itself with no wiring attached. I have linked a diagram of how to connect it to your 5th wheels wiring. The second option is the Hopkins 7-Way RV Style Connector with Molded Cable item # H20046. This provides you with...
    view full answer...
    Image 1 for
  • Hopkins 7 Way Molded Plug Wiring and Junction Box for a Boat Trailer Wiring Harness
    There's not a universal way that trailers are wired. I have attached a diagram showing the three typical ways and this should also help you to connect to the 7-way harness you purchased once you identify your wires. Yours is obviously different, thank you for including the picture. To identify the wires on the trailer you will need to apply 12V power from a car battery to see what function each wire activates. Ground the battery negative terminal to the trailer frame and then one by one...
    view full answer...
    Image 1 for Image 2 for
  • Parts Needed to Switch From Hydraulic Trailer Brakes to Electric
    As long as your existing brake assemblies are 10" x 2-1/4" and your axles are 3500-lbs capacity you can replace them with the Electric Trailer Brake Kit 10" # AKEBRK-35 - these will work with the 4 bolt mounting flanges you currently have. Since these are manually adjusting brakes, you'll need a brake adjusting spoon # W80630 to adjust these brakes after they're installed. Also, since they do not come with any mounting hardware you'll need Mounting Hardware Kit # BRKH10B. Because you're...
    view full answer...
  • Changing From Hydraulic to Electric Trailer Brakes on Trailer With 2,000 lb Axle
    I took a look at the specs of your 1998 Jayco Eagle 12UDST, and it looks like this is a single axle trailer with a 2,000 lb axle. That means you likely have a 7" hub and drum like the Dexter Hub and Drum Assembly # 8-257-5UC3-EZ, though you will want to confirm that by measuring the inside diameter of the hub. If you do have a 7" hub and drum, as well as a 4-bolt mounting flange like # 4-34, the correct electric brakes are the Electric Trailer Brake Kit - 7" - Left and Right Hand Assemblies...
    view full answer...
  • Parts Needed to Replace 3,500 lb Hydraulic Drum Brakes With Dexter Electric Trailer Brakes
    Thanks so much for that specific info, and for your brake flange distance and drum diameter, you are right on with the Dexter electric brakes # 23-468-469 working for you. Along with the brakes, you'll also need the wiring, 7-way connector, and breakaway kit to complete the transition from hydraulic drum brakes to electric trailer brakes. - Dexter Nev-R-Adjust Electric Trailer Brake Kit - 10" - Left and Right Hand Assemblies - 3.5K # 23-468-469 - Bright Way Push-to-Test Trailer Breakaway...
    view full answer...
  • Dimensions of the Trailer Wiring Junction Box
    The Trailer Wiring Junction Box # 3375601100 has dimensions of 8-1/2" long, 3-5/8" wide and 2-1/2" tall. The distance between the mounting holes (center of hole to center of hole) is 7-13/16". I have included a video that shows these measurements starting at the 2:15 mark of the video.
    view full answer...
  • Can Trailer 4-Way be Wired to Activate Trailer Brakes
    A 4-way is not able to activate trailer brakes as it is for lighting only, so it doesn't have the ability to carry the signals to your brakes. So what you'll need for your trailer is a junction box and 7-way: - Junction Box - 7 Terminal # 3375601100 - 7-Way RV Style Connector - Trailer End 6 ' Long # HM20086 or 8' Long # H20046 You'll wire your brakes (as well as your lights) directly to the junction box, which the 7-way is hooked up to. What you will need is brake wire, which is available...
    view full answer...
  • Parts Needed to Rewire Trailer with 7-Way
    We can get you set up to re-wire your trailer with a 7-way, and while there isn't a complete kit, we do have everything you need, which I'll go ahead and list out for you. Junction Box # 3375601100 7-Way Connector # H20046 Ring Terminals # 44-5310A Brake Wire (Sold by the Foot): 10 Gauge Primary Wire # 10-1-1 Wires for Lights (Sold by the Foot): 14 Gauge Primary Wire # DW02412-1 12-10 Gauge Butt Connector # 05732-2 16-14 Gauge Butt Connector # DW05714 Performance Tool Crimping Pliers # PTW30764
    view full answer...
  • Taillight Converter Needed To Separate Brake Lamp and Turn Signal Circuits
    The Curt # C56196 2 to 3 wire taillight converter is exactly what you'll need to split out the turn signal function from the brake lamp circuit. However, keep in mind that the # C56196 is NOT compatible with LED lamps, unfortunately we don't offer a taillight converter at this time that is compatible with LED lamps. You would wire the converter inline with the right and left turn and brake circuits. You will want to install the converter some place where it's protected from the elements....
    view full answer...
    Image 1 for
  • Parts to Convert From 12 Inch Hydraulic to Electric Trailer Brakes
    Thanks so much for the photos as they were very helpful; they show your trailer's drums are 12 inches in diameter, and that you do have a 5-bolt brake mounting flange. To switch from hydraulic to electric trailer brakes you are correct you would be able to use your current coupler as well as drums, and we do have the parts needed for you to switch, which are the following: - Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies - 5.2K to 7K # AKEBRK-7-SA -...
    view full answer...
    Image 1 for Image 2 for
  • Electric Trailer Brakes For 2,000 lb Jayco Pop-Up Camper
    We have exactly what you need to add electric trailer brakes to your 2,000 lb Jayco pop-up camper, and I'll go ahead and list out all the parts for you: - Electric Trailer Brake Kit - 7" - Left and Right Hand Assemblies - 2,000 lbs # AKEBRK-2 - Mounting Hardware for 7" Brake Assemblies # BRKH7 - Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot # 10-2-1 - Brake Adjustment Spoon for Drum Brakes # W80630 - Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20099 - Junction Box...
    view full answer...
  • How to Run an Electric Jack Off of a Trailer Battery and a 7-Way Connector
    The easiest way to power your electric jack off of the 7-way and/or the battery is to install the Trailer Wiring Junction Box - 7 Terminals item # 3375601100 and connect your jack to the 12v circuit that your battery would also be connected to. This would allow your jack to draw power from both your tow vehicle's 7-way or your trailer's battery. This inexpensive junction box provides a secure location for all of your 7-way connections. I have linked a review video below so you can see...
    view full answer...
  • 12 Inch Trailer Brakes for 5-Bolt Mounting Flange and How to Determine Correct Bearings
    Let's start with the brakes, and we do have electric brakes that fit a 12 inch diameter hub and a 5-bolt brake mounting flange, the Electric Trailer Brake Kit # AKEBRK-7-SA. These are 12 inches in diameter x 2 inches wide so that's what your drum would need to be, and are designed to work for 5,200 lbs, 6,000 lbs, and 7,000 lbs axles so you'll want to verify that's what you have. To mount them you will need the Mounting Hardware # BRKH12, and I have added a link below to a video install...
    view full answer...
    Image 1 for
  • How Many Sets of Electric Trailer Brakes For Tandem 3,500 lb Axles When Converting From Hydraulic
    Excellent questions, and let's start with your query about having brakes on both axles. The answer is that you do indeed want to have brakes on both of your 3,500 lb tandem axles. The reason is because just one set of 3,500 lb brakes won't have the stopping power required for a trailer that weighs 5,000 or 6,000 lbs, and also just one set of brakes will also wear out very quickly as they'll be overworked for the load they are rated for. So for the best stopping power and safest way to...
    view full answer...
  • Trailer Hitch Receiver For 2019 Honda CR-V & Wiring to Add 7-Way For Curt Echo
    We can get your 2019 Honda CR-V set up with a hitch and the necessary wiring, and you will need a 7-way in order to add electric brakes and use the Curt Echo brake controller. You'll actually need both a 4-way (for the trailer lighting functions) and will plug that into the 7-way, which gives you the needed wiring for the electric brakes. Let's go ahead and start with the hitch and wiring: - Curt Trailer Hitch Receiver # C13397 - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector...
    view full answer...


< Previous
12



Do you have a question about this Accessories and Part?


Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Shane H
Installed by:
Shane H
Employee Chris R
Video Edited:
Chris R
Employee Daron K
Edited by:
Daron K
Employee Brian T
Written by:
Brian T
Employee Jacob H
Video by:
Jacob H

At etrailer.com 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