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Junction BoxItem # 38656
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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.
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Specs:
Video of Trailer Wiring Junction Box
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Previously on This Old Trailer we installed the backing plates in the hubs and on this episode we are going to install the wiring. Basically what we are going to do is hook up the wires for the backing plates and run them up to the front of the trailer. We are going to install junction box part number 38656. It is a good idea to have a junction box in case you ever have to change out the lead going up to your truck. It is easily changed out especially if you have a wiring harness that is all molded into one piece. We are going to upgrade this trailer with our junction box so we can do that. Install it in this location in the channel on the tongue. Hold the box up to it, mark some holes out, and drill it out to 1/ 4 inch bit and use 1/ 4 inch hardware to hold it in place. When we get the hardware installed we can tighten it down into place. 01:29
Next we need to start running our wires from the junction box and we will follow the existing holes that are in the frame down to our brake axle. The next thing we will do is make the connections to yhe junction box. We are going to peel back the gray cable a little bit and then we are going to run our white cable to ground that is labeled in the junction box. We are going to treat the junction box just like the inside of a 7-pole connector. White is going to be ground and blue is going to be for electric brake lead, however on the cable we have got a black and white wire. White is going to stay white to ground while the black wire will go to blue in the junction box. The junction box also comes with different grommets. You can see here this one is opened up for the cable and we will just replace the one that is existing in the box right now. We will just pull out the original grommet and slide in a new one. 02:39
We will also clamp our wire in position with the hardware provided with the junction box. We will add some ring terminals to our wires and attach them in to proper position. Next I am going to make a connection to the first brake hub and make sure you have plenty of slack so you wrap the wires where they will not get mashed up against the frame. We will make our connections and just leave plenty of slack and then later we will come back with some loom clamps. Lets cut back some of the insulation and we will make the wiring connections to the cable. The actual connections to the wire we are just going to use what is typically called a quick splice and we are just going to use that to connect our wires together. The brake magnet itself has two green wires. It does not matter which one goes to power as long as you have a secure connection one is going to power and one is going to ground. It does not matter on the green. Again on our second brake hub we will cut our wire to length. Make sure we have plenty of length left over so we have room for suspension movement and make sure it does not get smashed again. The same thing as before, it does not matter which wire goes where on the magnet. Just make sure one goes to ground and one goes to power. In this case we will be using the butt connectors to make our attachment. When using a butt connector with a smaller gauge wire like we are doing here, it might be a good idea to take the wire and fold it over itself and then install it in the butt connector and then crimp it down. 04:56
We will run our 7-pole cable up to the front of the trailer by the coupler. We are going to run it through the factory guide and then run it into our junction box. We will start making our connections for our brake leads inside there. Slip on the grommet for the wire cable and just like the other side put it into place. Next we will make our wire connections up from our 7-pole cable. White is still going to be ground so we will run it to our original white wire and that is labeled for ground. We will run the blue wire to where the black wire was ran to and that pin is labeled blue. We will make our blue and black wire connection permanent and with our extra bits of wire we have we can use that to make our jumper for ground. We will use the grommet on the top and poke a hole through it and the white wire through there. On the white wire we need to make a jumper off that post on to the frame of the trailer so the trailer can get ground from that point and then we can make that connection permanent. We have the left over wires and our 7-pole harness. What those are used for is the lighting on the trailer itself and for the purpose of this video we are just going to these both alone for now because we are only dealing with the electric brake part. Our next thing to do is apply the 12 volt power to our circuit and make sure the brakes work. Spin the hub with the power off and then when you apply power the hub should stop. That will finish our installation of the brakes on a standard trailer using a junction box and a molded 7 way connector. That finishes this episode of This Old Trailer adding electric brakes.
Average Customer Rating: 4.8 out of 5 stars (534 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.by: Richard P.10/14/2017
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
Still works great, no issues at all.
Richard P - 10/14/2018 by: Doug B.10/12/2017
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
They work fine. Every week I tow landscape trailers or tractors.
Doug B - 10/19/2018by: Mark10/11/2018
excellent product, using this on my 2006 5 th. wheel RV. Lots of removeable access ports and new insulated open ports. This is much better and correct way to connect wires. They used just a junction box like you find in homes. Now you can test the wires for trouble shooting. 573473
by: James10/07/2018
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
by: Nicholas05/19/2017
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
Ok, the rubber hole gaskets worn out sooner than I expected.
Nicholas - 05/19/2018by: Jack Stout02/13/2017
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
by: Charlie07/01/2018
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
by: Paul10/09/2018
Great product, perfect replacement for my old box. 572916
by: Jason H03/19/2015
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
The box has continued to keep the wires working, safe and dry! Thank you for this great product!
Jason H - 03/18/2016by: Hazel Self03/10/2014
Works great, thanks. 120105
It was actually 2 of the trailer junction boxes. They both are working fine. Thanks.
Hazel S - 03/11/2015by: Ed B02/13/2017
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
by: Bob H.08/20/2012
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
by: lwal05/22/2014
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
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 - 05/27/2015by: Carl12/20/2016
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
by: Loren04/01/2013
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
by: Michael C.11/17/2012
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
by: Steve S.11/25/2013
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
by: Chris B11/07/2016
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
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 - 11/11/2017by: Matt W08/02/2016
Bought a fifth wheel camper last fall and the trailer cord was stiff enough that I could only find one position it liked to be plugged into the socket in the bed. Decided to replace the cord and get rid of the OEM metal junction box. I ended up ignoring the color code molded by each of the terminals and just went by the functions at were molded by the terminals. Everything is nice and neat with ring terminals connected to each terminal stud. Trouble shooting will be a breeze and future cord replacement will be easier. I like the fact that it eliminated a junction box full of wire nut connections. I tightened the lid screws until snug and did not have any issues. Grommets were sufficient and sealed up tight. I really wish there would have been a screw down cable clamp on each end instead of both on one end. 278702
Junction box is holding up great. No loose connections and the lid is nice and tight. Have not seen any issues with kid cracking or box leaking. Far superior installation than what came from the factory.
Matt W - 10/26/2017 by: Robert O.07/13/2016
Wiring junction box; made wiring easy; must have item. 271408
by: Sherman M.11/04/2013
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
by: Al07/19/2013
excelent just what I needed glad I found it on you product line I tried to find something to use for splicing the wires under my trailer Ialso like all the tech. information you have available on your web site 90534
perfect
Al - 01/17/2015by: Kevin L06/04/2017
I used this to connect the 4 pin coiled connector. This worked perfectly. I had five wires coming from the trailer, and this helped connect those. I drilled a hole through the back and through the trailer frame and fished the wires in through the back. This way there are no wires showing, they are fully protected inside the frame and the box, and there are no inline connectors to shake loose. The online help was just what I needed to know how to connect up the wires correctly. This was perfect! 388603
by: Joel j07/03/2015
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
by: Wayne M08/07/2014
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
Great job! Looks like a high quality build.
-- comment by: Mike D - 03/26/2015Its still working great.
Wayne M - 08/07/2015by: Dennis W05/30/2015
I wired plenty of trailers in the past the old way connectors and tape but this box is in my opinion a must have! Easy to wire nice construction and for the price it keeps every thing out of the weather and organized. Thanks Etrailer! 198648
Thank you for the concern, Everything I purchased from you are working as they should. VERY HAPPY with all.
Dennis W - 06/17/2016by: Billy Q09/29/2018
It Makes nice looking and clean job.Very prompt service from etrailer ! 570071
by: Robert S12/31/2016
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
by: Lance G09/26/2018
Solid construction. Easy to install. Looks like it should last a good long time. Speedy delivery. Would buy again 568943
by: Clinton09/19/2018
All the products have been great. They were installed on an older livestock trailer and they just keeping going. The white LED lights we put on the inside work too good. When I first pulled them out I thought they were too small and would do the job. They are so good we rarely use the one up front because the back one does such a great job. Thanks for the good products. 566953
by: BVP10/21/2018
Used to install a sealed, replaceable, whip to the vehicle. Also as a junction to hook up assessories. 576256
by: Loren09/07/2018
Very quick service. The wiring junction box sure made the task simple. Will use Etrailer again. 562458
by: Rickey08/23/2018
As always, great product, at great pric e. 557477
by: Mark07/31/2018
Worked as it should. 548203
by: Stuart07/28/2018
Received order very quickly. Pleasure doing business with eTrailers. 547159
by: Shelby07/27/2018
easy to install 546848
by: Roger07/18/2018
Handy little wiring block. Hardware included allows for different wiring locations. 543060
by: Andy07/15/2018
Everything arrived within 3 shipping days, installation simple and clean. Even though it was by email, customer service interaction was extremely impressive, everything from order receipt acknoledgement through confirmation of delivery. 542380
by: Randy K.07/13/2018
The quality of the junction box is excellent and it has allowed me to wire my utility trailer with all the electrical functionality I need in a manner that allows easy maintenance. 541407
by: Daniel06/30/2018
I haven't completed the rewiring project yet but the box seems to be perfect for the task. 528534
by: Don08/22/2017
This junction box is a very high quality unit at a very reasonable price, well below the price of others I have seen online. The box arrived 2 days earlier than promised just in time to do a weekend project. Thank you for quality at an affordable price. 423812
The box is working perfectly and I have not had any issues with it.
Don - 08/22/2018by: Sean P08/21/2017
Well built, sturdy plastic case with water proof seams. Mounted on the trailer frame so exposed to all types of weather. Very happy with the purchase. 423534
They still serve me well. High quality that lasts.
Sean P - 08/22/2018 by: Allen01/12/2019
Looks good bought but never used 596985
by: Mark01/04/2019
Great connection box. Seals nicely. 594917
by: RS12/31/2018
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
by: Darwin12/29/2018
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
by: Ricky12/11/2018
Loved this junction box! 590028
by: Kyle12/10/2018
product is exactly what is described and pictured 589612
by: Taff11/14/2018
Good product for a trailer rewire back of unit could use an extra hole for large round wire installation 582881
by: Dee10/30/2018
Excellent control box for trailer lights 578829
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