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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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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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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   (600 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:

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


Comments
1yr. later, no problems at all, thanks.
Herb B - 05/15/2020

76597

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



- 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:

Came in as it should have. 735748



- 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:

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:

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:

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:

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:

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:

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:

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:

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:

Good selection at competitive pricing. 857468



- 38656
by:

Product looks exactly like picture and functions well. I have used this type of box on all my trailers to clean up wiring. 849530



- 38656
by:

This thing is awesome and should be a must have for everyone who has a boat with electric breaks. Cleaned up my wiring 10X no more blinking lights traveling down the road. Extremely secure connection to trailer, just make sure you get self locking bolts. Also makes grounding to your trailer a none issue and keeps wiring secure and clean traveling down the road. Easy self install too! 848770



- 38656
by:

First Class products and Service!! What more can you ask for?? This will be my primary trailer parts supplier. 831306



- 38656
by:

Well made. High quality posts. Good grommets. Good overall experience 824190



- 38656
by:

Nice stopped my dim lights and ground p roblems 820317



- 38656
by:

simplifies truck to trailer connections. Much better than wire nuts that were there. Water resistant, too 806367



- 38656
by:

The service rep was terrific. She analyzed the alternatives and made helpful add-on recommendations without any pushy "up selling." etrailer comes through once again! 807223



- 38656
by:

I ordered several items to fix a trailer that had a previous shade tree mechanic fix. Items came quickly and were affordable. Website is very easy to navigate. I like to do things one time. Etrailer allows me to do just that with their expansive inventory. I have ordered several times and will continue to do so. This junction box gave the rewire a finished look. It is a great to be able to connect wires instead of butt connectors and tape. Also allows future addition of work lights, extra marker lights, etc. Adding an additional brake axle would be easy to wire. 796089


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Show More Reviews

Ask the Experts about this Spectro Accessories and Parts

  • Do I Need an Isolating Solenoid to Wire Aux Battery on My Trailer
    There are a few different ways you can wire a 12v battery to power your interior lights and maintain your breakaway battery on your trailer. You can find the 12v circuit on your trailer's 7 way connector, it's usually a black wire at the 11:00 o'clock position (if you are looking at the face of the plug). Connect that wire to the positive post of the new aux battery, and ground the negative post to the frame. Then you can connect to the aux's positive post to the positive post on the...
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  • How to Add a Battery to an Enclosed 6x12 Cargo Trailer for Powering Interior Lights.
    So the right way for you to do this will depend on how often you're going to use the lights and how many of them there are. If a trailer isn't equipped with a battery, the interior lighting is frequently tied into the running lamp circuit. Turn on the vehicle's running lights and boom, on come the lights. This is the simple way to go. You'd obviously need the truck there and plugged in to make that happen. You'd also want to run the truck from time to time so the alternator keeps the vehicle...
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  • Upgrading 4-Way of Trailer to 7-Way to Power Trailer Winch
    On a trailer 7-way the pin in the 1:00 position is the 12 volt accessory circuit. You'll need to make sure that pin is active on the truck side of the wiring. But there's no way to carry that charge circuit on just a 4-way so you'll have to install a 7-way on you boat trailer. For that your best option is the 7-way upgrade kit part # e99011 which comes with a junction box and everything needed to upgrade the 4-way to a 7-way and once you run some 10 gauge wire like part # 10-1-1 from...
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  • Wiring for Lights Using Junction Box # 38656
    If you take a look at the photos I've attached you can see how the wires from a 7-way connector can be run to junction box # 38656. You would also need ring terminals # 44-5310A. I've added a link to a video review, as well as an install of this junction box for you to take a look at.
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  • How to Access 12V Power Circuit on Trailer to Deliver Maintenance Charge to Trailer Battery
    You can deliver a maintenance charge to a trailer-mounted battery using the +12V power circuit included in your 7-way wiring setup. The simpler method is to access the 12V auxiliary power circuit on the trailer's 7-way wiring using a junction box like # 38656 or # 277-000141. The junction box provides a handy way to access all of the lighting, brake and power circuits and makes it easy to replace the trailer connector if it ever is damaged. You can connect 10-gauge wire like # 10-1-1...
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  • Can a 7-Way Junction Box Be Used for a 4-Way
    There's no reason you couldn't use a 7-way junction box like the part # 38656 to install a 4-way. It would be just a matter of wiring up only 4 posts of the junction box on the input and output side of the box instead of 4. With only 4-wires going into and out of the box the rubber grommet would be too big to provide a seal for the wires. You would need to use a sealant like # 0160297 to seal the grommet. I attached an install video for you to check out as well.
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  • Diagrams For Wiring 3-Axle Trailer With Brakes, Breakaway, And Lights
    It sounds like you want a diagram of the wiring for your trailer and breakaway system. I am attaching an article with pictures about wiring trailers. I am also attaching an article with pictures on wiring a breakaway kit. I also recommend making the wiring easier and cleaner with a junction box like Item # 38656. I have included a picture showing how it can be wired up and a video showing installation. Other items you might need for your wiring project is Item # DW04914-1 which...
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  • Parts Needed to Completely Rewire Trailer with 7-Way for Brakes
    Often times, people will run the wires from a 7-way such as yours to a junction box like part # 38656. From there, they will run the standard wire colors to the trailer lights, brakes and battery. I have attached a photo that shows how this setup works in the junction box. Most molded 7-way pigtails will come wired with the RV style color code. If you ever need to replace your 7-way connector in the future, you could simply open the junction box, remove the connector and wire loom and install...
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    The best way to power the interior lights in your trailer is with its own independent battery. You will not want to use the breakaway battery. The breakaway battery is only designed to operate the breakaway and will drain extremely quickly, they're only required by law to operate your brakes for 15 minutes. There's a few ways you can install a battery onto the trailer. One is to connect it to the 12 volt pin on the trailer's 7-way in place of the breakaway battery that is currently...
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    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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  • Parts Needed to Re-Wire 18 Foot Car Hauler Trailer with 7-Way Connector
    To re-wire your 18 foot car hauler with electric brakes on one axle, I recommend using a wiring junction box like # 38656 in order to make the connections from the lights and brakes. Then for a 7-way trailer plug, you can use the Hopkins # H20046. This connector has an 8 foot lead. The shorter 6 foot # H20044 or 4 foot # H20043 trailer connectors are also available. I recommend using a circuit tester like # 40376 to determine the functions for any wires that are not known, as just using...
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  • How to Determine Trailer Wiring Functions to Allow Installation of 6-Way Plug
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  • Testing Trailer Lights and Electric Brakes without Connecting Trailer to a Vehicle
    If you have a separate car/truck battery you could apply power to each of the pins on the trailer connector (or the wires directly some point behind the connector) and that should power on whatever is associated with a given pin.
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  • Can a Trailer Wiring Junction Box Be Used on a Trailer with a Battery and Power Inverter
    The junction box part # 38656 is a great way to organize trailer wiring on a trailer. There's no reason you couldn't use this with what you are trying to do. You would have to run the 12 volt accessory circuit of your trailer's connector to the junction box and then from there to the battery of the trailer.
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  • Does a Trailer Junction Box Have to be Used when Switching from 4-Way to 7-Way Trailer Connector
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  • Troubleshooting Trailer Brakes that are Always Engaged
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  • What Pin Does Brake Output Circuit of Trailer Attach to On Junction Box 38656
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    view full answer...
  • Recommended Wiring And Waterproof Lights For 2000 Ranger 620 VDS Boat Trailer
    To completely rewire the trailer you will need to start with a 7-way trailer side wiring harness like part # H20044. You will then need a junction box like part # 38656 to attach to the trailer. You will run the # H20044 harness into the junction box and run the wiring for the brakes and lights off of the posts in the junction box. You will need the appropriate size wire for the lights and for brakes if you have them on the trailer. You will want to run 10 gauge wire like part # 10-1-1...
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  • What Size Ring Terminal Will Fit the Hidden Hitch Wiring Junction Box # 38656
    I pulled the Trailer Wiring Junction Box # 38656, and Ring Terminal # 44-5310A, from our warehouse. The correct ring terminal size that will fit is part # 44-5310A, which is a 3/16 ID terminal for 12-10 gauge wire. I produced a short video showing that the # 44-5310A ring terminal fits on the post of the Junction Box. Also linked is an FAQ on trailer wiring.
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  • Availability of 40 inch Long 14,000 Lb Capacity Safety Cables
    Although we don't carry a safety cable that's rated that high, we do have a Fulton safety chain, # FCHA0050324 that's 42 inches long that has more than enough capacity for your needs. The chains are sold individually, so you'd need to order two of them. To find cables of the right length and capacity, you might try doing a Google search.
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  • How Do the Wires Connect to the Pollak 11609-EP / Junction Box and Is It Water Proof
    The connections on this Trailer Wiring Junction Box, part # 38656, are made on the inside of this junction box with ring terminals. The wires will travel through the rubber grommets to enter and exit the box. This box is weather proof, but not water proof, and what that means is that it will keep rain out under normal circumstances, but if it were to be submerged the box would not be dry on the inside. My contact at Pollak said that you could probably apply a rubber sealant to the lid...
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    The absolute easiest way to accomplish this task would be to use a Draw-Tite Wiring Adapter, part # 20027. You would simply plug this into the 7-way that is at the rear of you 1997 Chevy Silverado and then run the 7-way end up to the bed and mount it in a location that is easily accessible for your gooseneck. You will probably want to use some zip-ties to secure it in such a way that it will be accessible when not in use and not drag on the ground. You could make the Trailer Wiring...
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  • Can Spectro Trailer Wiring Junction Box Part # 38656 Be Used on Tow Vehicle for Splicing Wiring
    Yes, the Spectro junction box can be used in your tow vehicle for making wiring connections. This part has a heavy-duty weatherproof plastic housing and includes grommets and cable clamps. You will need to supply two nuts, washers and 1/4-inch bolts of the appropriate length to install the box on your vehicle. I have linked a video showing installation of this part on a trailer frame. The housing measures 3-1/2 x 2-1/4 x 7 inches. In case you need connectors or wire for your splicing...
    view full answer...

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