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Trailer Wiring Junction Box

Trailer Wiring Junction Box

Item # 38656

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38656 - Junction Box Spectro Wiring
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  • 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. 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.


  • All Info
  • Reviews (552)
  • Q & A (263)
  • Videos (3)
  • Photos
  • Why etrailer?

Spectro Accessories and Parts - 38656

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   (552 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 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:

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:

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:

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:

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 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:

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:

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



- 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:

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:

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:

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:

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:

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 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:

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:

Wiring junction box; made wiring easy; must have item. 271408



- 38656
by:

Had some real issues with this one. Should have noticed when purchasing this harnes is not wired using standard truck/trailer color format. Other than that it went together fairly nice. If the connector would come apart I was thinking of fixing the wiring my self. 52400



- 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:

Thanks for your help with parts for my trailer build. My wife and I are still making custom cabinets out of curly maple. We hope to finish this winter. We have taken it out 7 times this season. Thanks again. 329116



- 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:

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:

excellent product and service. thanks!! !! 636209



- 38656
by:

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



- 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



- 38656
by:

Unit is well made and easy to install. Provides enough terminals to install new or replace damaged wiring between trailer and connector or replace damaged connector. Also convenient to make water resistant hookup of trailer brake connections. 606781



- 38656
by:

Direct replacement for one that was broke on one of our trailers--worked like a champ. 605999



- 38656
by:

Replaced damaged Jbox on trailer. 30 minute job. Perfect! 604907



- 38656
by:

This will make a much neater connection than splicing the wires to the pigtail. I have been updating my rollback trailer and decided to clean up the wiring. Great idea. Thanlks 604857



- 38656
by:

great quality product. Worked great 602322



- 38656
by:

Great product to bring wires together and tidy up. 600533



- 38656
by:

#1 Fastest Shipping A+ 599308



- 38656
by:

Looks good bought but never used 596985



- 38656
by:

Great connection box. Seals nicely. 594917



- 38656
by:

Economical replacement for my cracked junction box. The bolt holes lined up with my old one, and there were enough grommets and plugs to cover most applications. Installation couldn't have been easier. Some grommet holes were too large for the wires I was using, but a little silicone sealed them up. 594191



- 38656
by:

For the price and look this will be fine for connecting the wiring harness neatly rather than the rats nest the prior owner had. 593812



- 38656
by:

Loved this junction box! 590028



- 38656
by:

product is exactly what is described and pictured 589612



- 38656
by:

Good product for a trailer rewire back of unit could use an extra hole for large round wire installation 582881



- 38656
by:

Excellent control box for trailer lights 578829



- 38656
by:

etrailer is great, quick shipping & del ivery 578785



- 38656
by:

Great product if you plan to add multiple connectors on your trailer. Allows you to tie in the two connector cables into the wire harness of the trailer itself and have all the connections easy to access. Also allows you to add circuits as easily as crimping on some more ring terminals and adding the wires. Keeps all the connections neat and tidy. A must if you have brakes and plan to use then with a vehicle that has a brake controller module, and on a vehicle that has the flat four only connector. I can tow my flatbed with either of my trucks and connect the trailer to either connector with no adapters. 578571



- 38656
by:

These boxes certainly enhance a rewire or original wiring of a trailer. Makes trouble shooting much easier. 577286



- 38656
by:

Used to install a sealed, replaceable, whip to the vehicle. Also as a junction to hook up assessories. 576256


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  • How to Power Enclosed Trailer Lights Off of 12V Battery
  • I can tell you exactly what you'll need to power your enclosed trailer's lights off of an independent 12V battery, though there isn't an adapter. You first need to mount the battery with a battery box for 12V batteries like # TLA7708R, and then use junction box # 38656 to tap into your trailer's 7-way. You will also need ring terminals # 44-5310A, and wire # 12-1-1 to run to each light, and to turn the lights on, a light switch such as the Pollak rocker switch # PK34308 or toggle...
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  • Clearance Using Fifth Wheel Hitch on 2013 Ford F-350 Short Bed
  • From your measurements and the nose of your trailer it sounds like you will be able to use the B&W Companion # BWRVK3500-5W with your 2013 Ford F-350 Short Bed. However, you're cutting it close, and may run into issues on uneven ground so I still recommend going with a sliding hitch like # BWRVK3400-5W. It gives you 12 inches of movement so there won't be any question of clearance. To clarify the offset of the B&W Companion, you are correct that it allows 7 inches with the post in...
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  • Does etrailer Axle Teknology 10-Inch Brake Assembly AKEBRK-35L Include Trailer Wiring
  • The etrailer Axle Teknology 10-inch brake assembly # AKEBRK-35L and the matching right-hand unit # AKEBRK-35R come with two wire leads (from the brake magnet) that are just a few inches long. The actual 10-gauge wire you'll use to install the brakes, # 10-1-1, is offered by the foot. Either wire lead from each brake can be used for hot or ground since these are non-polarized. Often parts like junction box # 38656, 7-pole plug # H20046 and ring terminals # DW05741-1 are used to complete...
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  • Recommended Surge Brake Actuator With Electric Lockout For Drum Brakes
  • We do have a surge actuator that has an electric lockout for drum brakes. I recommend the Titan Zinc-Plated Brake Actuator, part # T4339720. This actuator is adjustable to fit 1-7/8, 2, and 50-mm hitch balls and is a bolt-on for 3 inch wide trailer tongues. The breakaway kit is included with this actuator. If you have a 7-way connector on the back of your Expedition, you will need to change the trailer connector to match. I assume you have a 4-way connector. I recommend a 7-way connector...
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Info for this part was:

Expert Research:
Michael L
Video Edited:
Zack K
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Photos by:
Amber A
Expert Research:
Jeffrey L
Photos by:
Sam P
Photos by:
Zach O
Updated by:
Shelly K
Updated by:
Sarah W
Photos by:
Jeffrey L

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