Trailer Wiring Junction Box

Trailer Wiring Junction Box

Item # 38656

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38656 - Junction Box Spectro Wiring
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This Spectro trailer wiring junction 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. Call 800-298-8924 to order Spectro accessories and parts part number 38656 or order online at etrailer.com. Free expert support on all Spectro products. Guaranteed Lowest Price and Fastest Shipping for Trailer Wiring Junction Box. Accessories and Parts reviews from real customers.
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  • Reviews (574)
  • Q & A (277)
  • Videos (3)
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Spectro Accessories and Parts - 38656

  • Wiring
  • Junction Box
  • Spectro

This Spectro trailer wiring junction 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.


Features:

  • 7-Terminal junction box lets you easily connect your trailer wiring to a 6-way or 7-way trailer connector (sold separately)
  • Weatherproof, heavy-duty plastic protects wires and terminals from the elements
  • Mounting hardware included
  • Ring terminals (44-5310A) sold separately


Specs:

  • Box dimensions with lid: 7" long x 3-1/4" wide x 2-3/4" tall
    • Overall length (with mounting flanges): 8"
  • Distance between mounting holes (on center): 7-3/8"
  • Mounting flange dimensions: 3/4" wide x 1/4" thick
  • Outer diameter of terminals: 3/16"


9709 Spectro Trailer Wiring Junction Box







Video of Trailer Wiring Junction Box


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




Video Transcript for Spectro Trailer Wiring Junction Box Installation

Today were going to install part number 38656. This is a trailer wiring junction box. First thing were going to do is find the location for our junction box. Were going to go ahead and install on the inside edge of the tongue. Well go ahead and hold it up to the tongue and then well go ahead and use a drill to mark it for our holes. We have our holes marked, well go ahead and remove the box, and then go ahead and drill out our hole.

Now well go ahead install our hardware and install our box. Now were going to use a quarter inch hardware to install the box to the frame. This hardware does not come with the box. With our box installed, we can go ahead and start getting our wiring ready. Well go ahead and cut our wires to the length of what we need and then well take our excessive length from our gray cable and use the white wire for our ground lead.

Were going to take the white wire, well add a couple of ring terminals, and well go ahead and connect it to the post labeled white and ground. Well also change out one of solid grommets for a hollow ground. With our new grommet installed, well go ahead and fish our wire through, and attach it to the box, and then were going to use a self-tapping screw to attach it to the frame. Now well go ahead and get the rest of our break cable ready, the gray cable will be for our electric brakes. Well cut back the gray sheath to expose our two wires.

Our white wire will go to ground, our black wire well go ahead and post to label blue, blue is only the function for brakes. Well go ahead add some ring terminals to it, then temporally put them into position. Now well go ahead and hook up our wires for our trailer lighting, well also go ahead and run it through the grommet and then go ahead and install our ring terminals. Now the brown wire on our trailer will be even running light circuit that will go to the post labeled brown, it will also say taillights on there. The green wire will be our right turn signal, well go ahead and connect that wire to a post labeled green, and it will say right turn.

The yellow wire well be our left turn signal and that will be connected to post labeled yellow and left turn. Now these wires have been loosely installed. Next well go ahead and wire our trailer connector, this is going to be a seven molded trailer wire connector, eight foot long, part number h20046. You see the seven pole and we have our wires. Once thing to know about this is that the functions do not match the colors better on the trailer. Now on the other side of the box well go ahead and replace them with solid grommets with a hollow grommet and well go ahead and run that over our wire that we can go ahead and push the wire back into the box. Then well go ahead and add our ring terminals to our wires. Now well go ahead and start attaching our wires, well start off with the green wire from the seven-pole which will be our running lights; this will be connected to the post with the brown wire from the trailer lights. The brown wire will be our right turn so that it will be connected to the post with the green wire from the trailer lights. The red wire will be the left turn function on the seven-pole, so well connect that to the post with the yellow wire from the trailer lights. Our blue wire will be our brake control power, so well hook that up to the post labeled blue. Now our yellow wire is usually reserved for reverse light or whatever function youd like. However, this application is not being used, so well just ignore that wire. Our black wire will be our 12 volt power supply, however this trailer is not using it right now, but well keep it to the junction box for our upgrade in the future. Well now go ahead and take our white wire push it to the ground from our towing vehicle that will be transferred to the trailer and well connect that back up to the white post, well get two white wires. With all of the wires in place well go ahead and tighten down the nuts. Next well go ahead and install the clamp from the wires that come in from the trailer side. Looking at the box on the left hand side there is provision for a clamp. Well make sure everything is pushed together properly and wont get pinched, well go ahead and install the cover. Well fasten and replace of these two bolts. Thats what it takes to install our junction box. All right with that it will finish it for our install of part number 38656, a trailer line junction box on this new trailer.


Customer Reviews

Trailer Wiring Junction Box - 38656

Average Customer Rating:  4.8 out of 5 stars   (574 Customer Reviews)

This Spectro trailer wiring junction 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.

- 38656
by:

i have used the product and it seams to be working fine i have nothing negative to say about the product very happy 695804



- 38656
by:

This product is very easy to install and seems to be of very good quality. I like the way they designed it so it is waterproof and it came with everything you could possibly need to install it. 642028



- 38656
by:

The wiring junction box is high quality, watertite, and makes for a professional wiring of brakes and lights. I am in the process of converting all my trailers to this junction box. 132015


Comments

This an excellent device that makes trailer wiring easy an easy to maintain. Highly recommend the box if one has the room to install it which some of my trailers dont.

lwal - 05/27/2015

12092

- 38656
by:

This product is a great way to fix a spot in the wires where they dragged on the ground. I simply cut out the bad areas and attached proper size wire nuts and secured this junction box. 179837


Comments

The box has continued to keep the wires working, safe and dry! Thank you for this great product!

Jason H - 03/18/2016

17164

- 38656
by:

I have ordered several products for the re-wiring and updating of by 10000 lb sailboat trailer. I have ordered electric brake kits, wire terminal boxes, led lights, etc. The shipping is incredible and fast, and the products are well made. 640109



- 38656
by:

We wanted both a 7-wire and a 4-wire plug on the same trailer. This junction box made the installation very easy. If your connecting the Hopkins 7-wire harness to this box, you'll probably have to ignore the wire colors names and just use the location (R Turn, etc.). Both are marked on each terminal. There are 5 different openings to choose from to route the wiring to this box and it comes with both rubber grommets to run wiring through and rubber plugs for the openings not used. A downside is that only the side with 2 openings has wire hold downs on the inside. It would have been nice if at least the opening on the opposite end also had such a feature. It's fairly water tight and installed easily onto the frame, under the trailer. Because it's lightweight plastic, I'm not so sure how long it'd last in the direct sunlight if it was mounted on the tongue or other exterior location. 106238



- 38656
by:

This junction box made it very nice to hook up my trailer plug to the trailer wires rather than individually connecting them and trying to keep them sealed from the elements. It also made a much cleaner set up. The box itself is made of a rigid but flexible plastic rather than a hard plastic that tends to break. 528876


Comments

I’m still happy with the product and would recommend it to future buyers.

Charlie - 07/03/2019

57410

- 38656
by:

This product didn't do much for me. It's a minor pain to use and not much benefit. That said, there is nothing wrong with it. 442156


Comments

They work fine. Every week I tow landscape trailers or tractors.

Doug B - 10/19/2018

44804

- 38656
by:

I have used errailer at different times. Each time their products have been the absolute best. Their phone clerks are knowledgeable of product and service. Shipment time has always been extreamly prompt, sometimes as little as 2 days, retailer is unaware that I grew up in a fleet service shop, I owned and operated my own for 20plus years. I also have a [retail] store that uses their service, a simple ITS THE BEST is all I should say! 343776



- 38656
by:

Well made product with a great design. The only criticism I have of the product is the cheap flat head screws provided with it. They should be stainless and the smaller ones Phillips head. If the screws were of be it would have gotten a five star rating. 341553



- 38656
by:

I love these boxes. I've repaired numerous trailers my sons and I own, including cargos, flat beds and horse trailers. I really like the grommet locations, cable clamping and posts for wire connections. There is plenty of room inside to neatly route wires. 108409



- 38656
by:

I am very happy with this purchase this 7 wire box. Is just what I was looking for when I rebuilt a 1997 car trailer all the wires I have run to this makes my job look like it came from the factory that way ! I am also pleased to note that at the time of my order I mess up on the shipping didn’t notice it until I receive an email from E trailer explaining it an that they upgraded my shipping at no additional charge to me. As it says on the box when it arrived the bottom of the box should not be the end of our relationship an it won’t be definitely will order more from E Trailer !!!! 572518



- 38656
by:

This trailer was built from scratch using only the metal frame. I purchased some items from etrailer an was very satisfied with the products. 144937


Comments

Great job! Looks like a high quality build.

-- comment by: Mike D - 03/26/2015

10361
Comments

Its still working great.

Wayne M - 08/07/2015

13983

- 38656
by:

Installed in about 30 minutes, made install a breeze and took the mess out of a rats nest of wiring spliced under the trailer. Comes with plenty of grommets and all hardware to put together. You need to supply the bolts or screws to mount this to your trailer. Each terminal is labeled for what connects to it taking the guess work out of matching wires up. 442709


Comments

Still works great, no issues at all.

Richard P - 10/14/2018

44615

- 38656
by:

Rewired my trailer and used this junction box to go from my main cable to all the individual lights and brakes. It worked great, the only thing I didn't like about it was that it only had two cable clamps on the inside 314692


Comments

I still have all the electric supplies from etrailer on my cargo trailer. I have had no issues with any of your products whatsoever. I hope this helps

Chris B - 11/11/2017

30714

- 38656
by:

For the price, I expected this to be higher quality. The junction box is functional and the labeling is excellent, however, the plastic is weak and the screws provided tend to tear up the plastic and may not work well at all if the box is opened or the cables are adjusted more than once. Problems with the junction box: - Strain relief screws protrude through the bottom of the box, compromising the moisture seal. When tightening the cable clamps, the screws are too long and cut through the bottom of the box. - Plastic is weak: When tightening the screws that hold down the lid, the bottom of the box becomes distorted. - terminal block is not well secured to the box. Only two rivets hold the terminal block to the box and even moderate torque on the terminal screws causes the terminal block to wiggle. 326689



- 38656
by:

I installed this J-box over the weekend, and overall I'm pleased with its construction, particularly quality-per-dollar. The one 'concern' I have is that the grommets seem rather frail. After sliding over the 7-way wiring (H20046), I ripped the grommet as I slid it into the box. My guess is that it'll stay water tight for a minimum of several years living outdoor in the UV light, at which point I'll figure out some other way to keep it water tight, if needed. The J-box fits neatly inside the channel-iron frame of my trailer. The next time I need to wire a trailer, I'll certainly install one of these; a great value compared with piecing something together from the electrical supply section of my local Big-Box Store. 73670



- 38656
by:

Junction box was great had it installed and wires hooked up in a little over an hour. Service and shipment was better than expected. Will definitely use etrailer for more of my needs, very good company. The only thing that took a while was the molded seven connector wire colors don't all follow standards, but a test light and a few minutes and it was figured out. 209099



- 38656
by:

Met my needs to put new junction box under my travel trailer. 633561



- 38656
by:

Very good value for the money. Not the best unit on the market but the price point was perfect for my project. Each terminal is labeled inside for ease of installation. The ONLY thing I wish it had is a seal for the cover, however I will just use a bead of silicone to seal it. 643342



- 38656
by:

I purchased this product after researching current trailer rewiring methods. I recently had my entire 18' trailer wired and upgraded. The trailer is 8 years old and I wanted to replace the original 4 way trailer harness which the trailer manufacture had surrounded in electrical tape which also needed an adapter. After some research, I opted for this 7 way pigtail (50-67-005) which is the connector I needed my trucks and this junction box. (all contacts were current) The junction box is sturdy and well made, we installed 7 way wire within the box with a snug fit. The trailer now has a clean professional appearance and most test functions can be performed from the junction box location. The junction box was installed behind the trailer tongue frame to minimize the weather elements. This product appears to seal well as the product description indicates. I am very satisfied with this product and Etrailer's customer service. 59585



- 38656
by:

This box is a great idea. The color coded were not right on my trailer. The box allowed me to move the connections around until I got it working properly. 382692


Comments

Ok, the rubber hole gaskets worn out sooner than I expected.

Nicholas - 05/19/2018

38672

- 38656
by:

decent junction box- for the price difference, I thought it would be better quality. 727809



- 38656
by:

Very fast service!!!! Good parts at a fair price. 725946



- 38656
by:

Great service and fast delivery! Awesome website and easy to find what I needed! 725855



- 38656
by:

Product was better than expected. Customer service was great and delivery was very fast. 724647



- 38656
by:

I had a week before vacation. So I decided to replace (wait till the last moment right?) my damaged 7-way trailer electrical connector on my travel trailer which I had recently purchased from etrailer. I found that the junction box inside the trailer was damaged from repairs done by the previous owner. In a panic I ran into the house, got on etrailers excellent website, and found the exact replacement junction box for my trailer. With little hope, I ordered the part and paid for 3-day expedited shipping. My part arrived a day early and the installation went fine. Thank you etrailer! You stocked my particular junction box and shipped it ASAP. Thank you so much! 719887



- 38656
by:

Still works as it should. No problems at all 713098



- 38656
by:

Great product. Nicely made and had enough extra grommets to accommodate my needs. Will be getting another for my other trailer too. 711139



- 38656
by:

Made my installation very tidy. 707329



- 38656
by:

Revived what I needed and very quickly. Thanks!!! 706350



- 38656
by:

etrailer as always has what I need, ships fast, and product is "as advertised"! A pleasure to talk to the tech's when I have questions and even go as far as calling manufacturer to verify equipment selections. Keep up the GREAT work. 705071



- 38656
by:

I liked the product I purchase from etr ailer. 683014



- 38656
by:

The product is just what I ordered, fast and friendly service and delivered on time. thank you ! 679604



- 38656
by:

Great products for a reasonable price. 674794



- 38656
by:

This box was used as part of an electric brake conversion on my trailer. This box was an excellent means of connecting the existing wiring and the new brake wiring into the new 7 way trailer connector. It has the required breakouts and grommets needed to make the wiring task the easiest part of the conversion. 674323


Comments

For a neat install and ease of replacement later if necessary, theres no better way to go than a junction box.

-- Mike L - 07/25/2019

58223

- 38656
by:

Works well, although the plastic case is a bit flimsy. 673844



- 38656
by:

I purchased my 7x16 cargo trailer less than a year ago (A Major Trailer Co.) All was good until the marker lights shorted out and burned the wiring inside THEIR junction box. They used a metal commercial building junction box on the outside and underneath the trailer. Not sealed. The grime I found inside. What the heck Major Trailer Co! If I had known that was the kind of craftsmanship being put in place I would not have purchased the trailer. Thank goodness for etrailer. I ended up replacing the junction box I purchased from etrailer and the 7pin plug from the tongue back. Thank you etrailer! 666416



- 38656
by:

Works perfect 649736



- 38656
by:

Boxes work great and makes for easy weatherproof connections. 648104



- 38656
by:

This wire is very easy to work with and splices nicely. Used in conjunction with a terminal box and a molded 7pin connector lead made my rewire a breeze. Spend a few extra dollars and buy heat shrink or heat shrink connectors and quality cable clamps. 645151



- 38656
by:

Haven’t made but one trip and seem to work ok. 643754



- 38656
by:

excellent product and service. thanks!! !! 636209



- 38656
by:

Nice piece to help organize connections for 7-pin replacement. I mounted this inside the trailer. This was located under the front bed in the Airstream 625681



- 38656
by:

Working as intended 620298



- 38656
by:

The product was great! Greatly simplified the trailer connection rewire 619220



- 38656
by:

Very nice quality! Please with purchase. 616683



- 38656
by:

Everything we needed was IN STOCK! We needed Next Day Air Shipping and we got it the next day! Called ahead of time to see if our items were actually in stock. Very nice gentleman confirmed everything and gave us information on the Next Day Air process. Completed transaction online through PayPal. Very pleased. Will buy again and again! 614842



- 38656
by:

Just what I ordered 609265



- 38656
by:

Good product, but your tires Stink 608531


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  • The Curt Vehicle to Vehicle Tail Light Converter # C56196 that you purchased (along with some additional trailer lighting) separates the combined stop/turn signals fed to it into discrete stop and turn signals that can be fed to the individual lights. Since your toy hauler has incandescent lights on it the addition of a LED third brake light should not pose any issues related to current demand. This vehicle-to-vehicle converter connects at the toy hauler lights at the rear of the trailer....
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  • Installation Instructions for Breakaway Kit Part # 50-85-313 and Trailer Wiring Junction Box # 38656
  • The wiring for the Tekonsha breakaway kit # 50-85-313 and trailer wiring junction box # 38656 is listed below. You can also view the picture to the right. The breakaway kit will have 3 wires to hook up where as the breakaway switch will have 2 wires. Take either brake switch wire and connect to the blue wire from the battery box. The other switch wire is output to the trailer brakes. White is ground and black will connect to the 12 volt circuit from the 7-way connector. The trailer...
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  • Electric Brakes and Tail Light Wiring for Tandem Axle Trailer with Brakes on One Axle
  • The wiring I would go with, based on your dual axle trailer with 1 axle electric brakes, is the 7-way molded connector (10 feet long) # 50-67-005. The wire is insulated which protects it well from the elements. I recommend getting a junction box like # 38656 because it makes it easier to diagnose problems when using a junction box. If you need wiring from the junction box to the brake assemblies, you can use duplex wire # 10-2-1. Protecting your wiring from corrosion and moisture is...
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  • How to Install a 7-Way Trailer Connector Harness on a 5th Wheel Trailer
  • The switch on your pin box is probably the breakaway switch. One wire from the switch will go to a 12v battery on the trailer and the other wire will tap into the electric brake wire on the trailer (typically a blue wire). I have attached an installation video for a breakaway kit to give you an idea of how it is installed. The wires that you listed on your trailer are not all common colors, so the best way to determine the function of each wire is to use an independent 12 volt power...
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  • Brake Controller And Brakes Recommendations For 2010 Kia Sedona And Trailer
  • Thank you for the spec sheet on the axle you have on your trailer. I spoke with my contact at Dexter and they told me that you do not need to replace your axle, you can just upgrade the one you have. They told me that you have the brake mounting flange mounted on your axle so what you will want to do is add a new hub and drum, the brakes, and wiring for your trailer, and you should be good to go. The hub and drum I recommend is the etrailer.com Trailer Hub Assembly, part # AKHD-545-35-G-K....
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  • Curt Trailer Wiring Harness part # 56146KIT Recommendation to Convert Separate Signal to Combined
  • Yes there is, you would need to install the Curt Trailer Wiring harness part # C59496 on your ambulance and it will convert the separate trailer wiring to a combined signal that would work well on your trailer. I attached installation instructions and an install video that shows a typical installation to show you how to test the circuits and install this harness.
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  • Installing Brake Controller On Kia Sorento For Towing Enclosed Trailer
  • In order to use a surge coupler, you'd need to replace the coupler on your trailer, as well as the brake assemblies and possibly the brake drums. You'd also need to run brake lines. Honestly, your most economical and safe way to proceed here would be to complete the wiring on your trailer, and install a 7-way and a brake controller. Installing the brake controller would be a pretty simple process. I'd recommend you go with a proportional brake controller, like the Tekonsha Primus, part...
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  • Converting Boat Trailer from Surge Brakes to Electric Brakes
  • If you can give us the brand of the axle and the weight capacity, we can probably find everything you need. There are a few things to consider when converting the surge brakes to electric on your boat trailer. I have attached a helpful article that explains what is needed to add electric brakes to a trailer. The first thing you will need to know is the weight rating of your axle. This should be on a sticker or plate. Next you will want to select hub/drum assemblies that use the same...
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  • Adding Electric Brakes To ShoreLandr Boat Trailer
  • I did some research on your ShoreLandr trailer and found it has a weight capacity of just under 3,000-lbs. To add electric brakes to your trailer I recommend part # AKEBRK-35R-SA for the right hand and part # AKEBRK-35L-SA for the left side of the trailer. These assemblies have a 4-bolt brake mounting flange pattern. For a hub and drum I recommend part # AKHD-550-35-K. This hub and drum assembly includes Inner bearing (L68149) and race, outer bearing (L44649) and race, grease seal,...
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Video Edited:
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