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Trailer Wiring Junction Box - 7 Terminals - Polypropylene

Trailer Wiring Junction Box - 7 Terminals - Polypropylene

Item # 3375601100
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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. Guaranteed Lowest Price and Fastest Shipping for Trailer Wiring Junction Box - 7 Terminals - Polypropylene. Accessories and Parts reviews from real customers.
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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 Reviews

Trailer Wiring Junction Box - 7 Terminals - Polypropylene - 3375601100

Average Customer Rating:  4.7 out of 5 stars   (115 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:

I use these all the trailers here. The polypropylene stands up much better to sun, weather, and bumps than the ABS versions. Makes it real easy to change out the trailer plug when they inevitably get damaged.



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:

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!!


Comments
One year later and the box is still holding up strong! Great product!
BrianB - 06/17/2020

by:

Used when replacing connector and breakaway switch on my enclosed trailer. Was easy to use and install.



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!


Comments
Great! Still water proof and working fine.
Jon H - 07/25/2021

by:

well made, attention to details with grommet sizes.


Comments
Working perfectly, highly recommend
Rick - 05/23/2022

by:

These make it so much easier to troubleshoot trailer wiring and are a really clean solution.
etailer gets them to you faster than expected.
Great product, great price.



by:

Very good junction box for the money. I used it to wire in a 7 pin RV and 6 pin round to vehicle.



by:

Overall product looks good but would liked to have received mounting screws and wiring clamps that were advertised as part of the whole assembly.


Comments
This hardware is supposed to be included. Customer Service will be reaching out to you soon.
-- Etrailer Expert Sierra K - 09/13/2021

by:

Part arrived and was a day earlier than promised. I will install it this weekend and hope my installation is as good as the product.



by:

I think the product is exactly what I ordered and exactly what I wanted. The 1 star is for filling up my inbox with junk mail. It made me not want to do business with etrailer.com again.



by:

so far so good, much better than the top test unit. over time the top test button would take water in and short out the board inside. this one having everything on the side works much better



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.


Comments
A year later, all is well.
Chuck - 01/31/2021

by:

I'm using this box as a junction point on my semi tractor. Worked like a dream for trailer wiring splitter.



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.



by:

Great workbox for our trailer wiring pr oject.



by:

Exactly what I was looking for, fast shipping, best price…etrailer has never failed me!



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.


Comments
Still working great!!need one for a new build coming up. Thanks E Trailer.
John G - 05/19/2020

by:

Worked great for distribution of the trailer/power wires. The terminals make it easy to attach wires in an area they will not corrode. I will definitely use on the next trailer I rewire.



by:

I actually used this on my dump truck. I mounted it back by the hitch and split all the dump wiring off with in this box. It makes for a very clean install. Makes it very easy to connect trailer wiring.



by:

I chose this box because it was economical and I didn't need it to be water-tight because I mounted it inside my old camper. My priority was to organize a mess of wiring and to make it simple to switch the type of tow-vehicle connector. I'm very happy with the result. Those little nuts that fit on the terminal posts are 3/8 inch - so get a socket that size to help you screw them on and off (with your fingers not a wrench). And be prepared for those nuts to fall down and roll into hard-to-reach places inside the box. If you have a magnetic retrieval tool you can save some frustration.



by:

This box makes the wiring so easy especially if you have brakes and ever need to replace the pigtail/connector to the tow vehicle. I will likely use these of other purposes they are so convenient.



by:

Installation was a bit tricky as the wiring diagram instructions didn't quite match the truck(s) we use wiring. But figured it out and it has been working great since. Purchased it because original plug on trailer was too short and kept pulling free from trucks and dragging on ground.



by:

I have used these before and they are great for a trailer wiring project. However, you must be careful when mounting to ensure that you do not crack the housing. If the mounting surface is not perfectly flat and/or the mounting tabs flex it will crack. i mounted two on my trailer and one cracked the other did not. A little silicone will seal it up!



by:

Well built - exactly what I needed. Great response and quick shipping from etrailer. I have already placed another order with them.


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Ask the Experts about this Buyers Products Accessories and Parts



  • 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.
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  • Comparing Trailer Wiring Junction Box 3375601100 and Trailer Wiring Junction Box 38656
    The Trailer Wiring Junction Box part # 3375601100 and Trailer Wiring Junction Box part # 38656 are both pretty standard 7-terminal junction boxes. The latter is slightly smaller so there will be more places to mount it so that is what I recommend but you really can't go wrong with either option.
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  • Correct Replacement 7-Way Trailer Connector Pigtail for Travel Trailer
    The pin-out for a 7-way trailer connector is pretty consistent. Unless the connector was wired incorrectly, it should be wired as shown in the provided photo showing the correct pin-out. What CAN vary is the wire color codes, which are also shown in the photo. The # H20046 pigtail would work just fine for you, just be sure to follow the wire color code shown on the linked product page. I'd also recommend a junction box like part # 3375601100. A junction box provides a centralized place...
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  • 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....
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  • 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...
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  • Junction Box Terminal Post Size for Part # 3375601100
    The ring terminals you want to use with the junction # 3375601100 are the # 44-5310A which have an inner diameter of 3/16 of an inch.
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  • Battery Disconnect Switch for Use on Travel Trailer
    You can use the Marine Battery Switch # 277-000403 for your application but since this item is not rated for outdoor use I recommend using a junction box like # 3375601100 to provide a degree of protection from moisture. The switch housing (not including the knob) is about 1-1/4-inches deep so you'd want to use hardware that is about 2-inches long. If space is available in your battery box you might be able to mount the switch there. In this case a better choice might be the Epicord Battery...
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  • Creating 7-Way Trailer Connection Adaptor for 13-Way European Bike Rack Lighing
    We do not have any European 13 way adapters to make your bike rack lights compatible so you will need to rewire it. So you would need to create a custom adapter using a 7-way connector and probably a junction box to protect an external converter box that you will need to separate the stop light from the turn signal for your 13 way bike rack wiring. For this conversion, I recommend the Vehicle to Vehicle Tail Light Converter # 118158 along with the Wesbar Adapter - 7-Way RV to 4-Way or...
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  • How Is the Mighty Cord 7-Way RV Style Trailer Connector w/ Molded Cable Pinned
    In regards to replacing a trailer connector on a trailer with an option like the Mighty Cord 7-Way RV Style Trailer Connector w/ Molded Cable part # A10-7W8, you need to match wires by function not color. In other words, if there is a green wire on the trailer, you should apply power to that wire to see what light it activates. Then attach this wire to the trailer connector based on the function of the light and how it matches up with the diagram for the trailer connector attached below....
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  • Do etrailer and Bargman 7-Way Trailer End Connectors Have Same Use
    Yes, both connectors you mentioned are 7-way trailer end connectors with the same functions, so they do have the same basic use. The biggest difference is that theHopkins 7-Way RV Style Connector with Molded Cable - Trailer End - 8' Long - RV Standard Item # H20046 and is meant to be used with a junction box like the Trailer Wiring Junction Box # 3375601100. The other connector you asked about, the Bargman 7-Pole Connector # 54-67-525, is 1' long and comes with butt connectors so it is...
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  • 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...
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  • Wire Gauge of 7-Way & Junction Box
    While we have an alternative, the part number you asked about has been discontinued. But what you can use is the Trailer Wiring Junction Box # 3375601100 and Hopkins 7-Way RV Style Connector - 8' Long # H20046. This 7-way uses 14 gauge wires for the red, brown, green, and yellow; 12 gauge for the blue; and 10 gauge for the white and black wires.
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  • 2022 Toyota Highlander Wiring for a 7-Way Blade Connector
    I would be happy to help you set up your 2022 Toyota Highlander to haul your new travel trailer. The wiring harness you currently have controls your trailer's lighting functions only. You do not need to rewire your Toyota you just need another harness. The second harness you will need is the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires item # ETBC7. The kit includes a pre-wired 7- and 4-way trailer connector that mounts easily at the...
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  • 7 Way Connection with Junction Box With Traditional Wiring Scheme vs RV Wiring Scheme
    I have a solution for you, but we aren't going to have any 7 way connections and junction boxes that are wired with the same color wires/pin locations as the traditional wiring setups you're looking for. I recommend using the 7 way connector # 54-77-003 and hard wiring your plug the way you want it setup. You can get wire by the foot (12 gauge) # 12-1-1 or (10 gauge) # 10-1-1 and a Trailer Wiring Junction Box # 3375601100 to finish off this project. This will allow you to use the proper...
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  • Parts Needed to Add Brake Controller and 7-Way to 2002 Jeep Liberty & Trailer
    I can make a list for you of all the parts needed to add a brake controller and 7-way to your 2002 Jeep Liberty, and the prices can be found either on the product page or by scrolling down where the parts will be listed under "Products Referenced in This Question". So exactly what you will need for your 2002 Liberty is the following: - 4-Way (if your Jeep does NOT have the factory tow package): T-One Vehicle Wiring Harness # 118524 or (If your Jeep DOES have the factory tow package): Hopkins...
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  • Can Junction Box be Submerged When Rewiring Boat Trailer
    You can re-do the wiring on your boat trailer with a junction box, but a junction box cannot be submerged as they aren't waterproof. So if you are able to place the junction box in a location that allows it not to be submerged, the best option is the Trailer Wiring Junction Box # 3375601100. This comes with ring terminals and if you need wire we offer it sold by the foot with 12 Gauge # 12-1-1, 14 Gauge # DW02413-1, 16 Gauge # DW02359-1. You may also need Wire Loom # 459075-1 and a connector...
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    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...
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  • Ways to Install New 4-Pole Trailer Connector
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  • 12 Inch Trailer Brakes for 5-Bolt Mounting Flange and How to Determine Correct Bearings
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  • Parts to Convert From Disc Brakes to Electric Trailer Brakes
    You can convert from hydraulic disc brakes to electric brakes, though an electric over hydraulic actuator won't be used. Electric trailer brakes fit inside a trailer hub and drum, so the first thing you will need to do is remove your idler hub and rotor and get the correct hub and drum. To get the correct hub and drum, you need to know the weight rating of your axles, and also what bearings your current hub has. You will need to take apart your current hub assembly and look at the bearings...
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  • Parts Needed to Convert From Hydraulic to Electric Brakes for 3,500 lb Axles
    Thanks for that info, and based on what you said, it sounds like you have a standard brake mounting flange like # 4-35 for a 3,500 lb axle. I do recommend just double-checking the inside diameter of your drum, as electric brakes for 3,500 lb axles fit drums that have an inside diameter of 10 inches. Assuming that is correct, we have exactly what you need to outfit your tandem axle trailer with electric brakes, which are the following parts: - Two (for both axles) of the Electric Trailer...
    view full answer...


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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:
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