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Color coded terminals in the ABS 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.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everyone. Adam with etrailer.com. Today we're going to be taking a look at the Buyers Products seven pole trailer junction box. So this is going to be a really organized way to get all of your wiring from your seven pole of your vehicle tied up to the right function of the wiring of your trailer. This is going to do a couple of things, keep everything organized, keep it all dry because it does have a cap, but also a lot of the times we don't get trailers that configure with the standard seven pole color wiring. Luckily we lucked out and we can do basically color to color, but it's not always the case.
What's nice about this junction box is it is pre colored. Each stud is going to have the color and it does have stated green in text and also what that function will be on the other side.So it gives you a color cue and also a word cue to let you know how to wire this thing up. So when comparing this to some of the other junction boxes we carry at etrailer.com if you're starting from scratch, etrailer does make a kit that comes with a seven pole and a junction box and much more. Also we do have a Pollack brand that comes with a 10 function. So if you have a little bit more use for a couple more terminals here, definitely go ahead and grab one of those.It does look pretty difficult, but honestly it really isn't.
You just got to test your wires. So let's just go ahead and do all that together. So we're going to go ahead and check out our trailer's functions and you can either use a test box or just hook up your vehicle. So what we've got to do is I'm going to grab ground from my white wire here. You can also just ground it to the chassis of your trailer.
With my test box I'm going to be testing the right blinker. Ours is color to color, so brown should be the right one.So you can repeat that same exact process for all the wires. Just remember match it to function, not color. Now that we have all this wiring sorted out and we know every single wire and what it does, now we can go ahead and take our junction box. You kind of want to get an idea of where you want to mount it.
I think I'm going to mount it right here. You want to make sure you can get that cap on and you'll be able to tap in from the sides. Before we do all that, what we're going to do is I'm actually planning on using these two sides here to run our wires in and as you can see there's no holes.So in our kit that comes with the junction box we are going to get replacements that will have holes in them. So since I'm using these, I'm just going to take this out put it back in the box and these are going to eventually seat into the slot there. What I'm going to do to make it a little bit easier on myself. I'm actually going to fish these wires through first. So I'm going to to do the same exact thing for our wiring going to our trailer. Once that's done, I'm actually going to start with the wiring that comes from our vehicle and basically all we got to do is just put it into the slot like so. We're going to have to undo these screws right here. Take that off, put it in there.We might have to avoid these little brown plastic pieces here. That's going to be what's going to secure our lid into place. Then fasten it down. Once you think you're done, give it a good wiggle and make sure it's nice and tight. These ring terminals does not come with the kit. We do sell them here, so if you don't have any in your garage or anything, definitely go and pick those up whenever you grab one of these. Always make sure you've got a good connection and obviously have enough length to meet it to the right function.So I'm just going to put this nut on there pretty loosely just so it's not flopping around. I'm going to go ahead and put some ring terminals on all of our wires. For now I'm just going to match them up color for color on our junction box. So as you can see here, we just finished our vehicle wiring here and we're going to basically do the same exact thing for our trailer wiring. We're going to put this into place, but I got to undo these two screws first. Then we're going to go ahead, put those back, and screw them down evenly.So now we can just go ahead and put some ring terminals on all these wires and we're probably going to have to cut them and strip them back a little bit so they can fit into our junction box. So we've got all of our ring terminals on here and this side over here is going to be all of our trailer wiring. Over here is going to be from our vehicle. What we're going to do is as we put from our vehicle, all these wires have a specific function. So you don't necessarily need to go by the color because a lot of the times these trailer wirings aren't going to be color to color. So you could do it one at a time and test each and make sure that you're matching them up function by function. Let's take this nut off, place it on there.Tuck those wires away a little bit and put that nut back on. We are going to come through here with the tool to tighten these up. So now that everything is hooked up, now's a great time to test everything out and make sure everything's hooked up correctly. We're going to use the test box, but you can also just use your car. All right, so first we're going to start with our taillights.Our left turn signal, our brake lights, and our right turn signals. So now is going to be the time to mount it in its home. I want to angle it like so and we're going to run some cell tappers through this plate. One thing to note these cell tappers are not included with our kit. So once that's secured into place, give it a good wiggle, and make sure it doesn't go nowhere, and then we can go ahead and put our cap on. It doesn't really matter which way because these are going to line up regardless. Then we can take our screws and these we're included with our kit, slide on in there. Use the Phillips head tighten them down. Well everyone that's going to do it for our look at the Buyers Products seven pole trailer junction box.
This replaced an interior metal junction box on exterior front of almost every pull behind camper made. All connections were wire nuts with massive corrosion.
Easy waterpproof fix for a minimal cost.
i used these junction boxes on two of my trailers. good to add to your trailer tongue so you can replace your cord/plug. this box is well made,weather resistant, and the studs that you connect the wires to are color coded.
Brant 
6/15/2025
i have had these junction boxes for a year now. im still happy with them.
Works great. I extended the tongue of my trailer so I can pull it behind the motor home. So I rewired the pigtail and put a new breakaway kit on. Everything from etrailer.
Overall I liked the way it organizes and protects the wiring connections. However, the screws and design for securing the cover did not seal tightly and basically stripped out (the screws could not lag down well like they didn’t get enough bite). I ended up chalking the entire lid and screws/ screw holes to get it to stay in and get a waterproof seal. If they improved this I would give 4-5 stars.
I have done wiring repairs on trailers for years. I like to use J-boxes like these because it really cleans up an installation or rewire job. These are quality boxes!
I have used several of these terminal boxes and they work great for using a standard length molded cable to plug into the towing vehicle.
They are very handy when trouble-shooting trailer wiring.
This was fantastic for my utility trailer. Made wiring everything super easy! For my small trailer I have led brake lights, side blinkers and I also had a 3rd brake light. There was still room so I put a female trailer plug just long enough to hang out of the box. That way I can connect a 'trailer light tester' and have an idea where potential shorts might be. ;-)
This greatly simplified my wiring issues and have now installed on two different trailers. It is also a nice logical place to go for trouble shooting.
I have a 2019 Forest River travel trailer. I started having brake problems and the dealer was no help so since i have some experience I started looking at the issue myself. What i found was a series of loose and poor 12v connections throughout the braking system and some in the lights as well. The main culprit was connections in the main junction box, see pictures. The factory used a household style jbox and not a quality sealed jbox. I looked on line to fInd a suitable solution that allowed easy access and easy installation. This product fit the bill Perfectly. After a couple hours work to remove the old box and install the new one (in new location) cut and install proper ends on all the wires and make clean secure connections my trailer now has brakes that work properly. The new box came with all necessary screws, nuts and has plenty of wiring install point options. It is all plastic so i was careful not to over tighten any of the screws used to retain the harnesses on each end of the box.
Thank you for a great product.
Tim
Gunter, TX
Happy Camper
Your connector box is a great product, easy to install each wire by color and number. I had a shorter than I expectd new harness and plug but the box made it eazy to place where I needed it instead of going into the trailer understructure. I placed the box between the traile tung under the battery box for easy future acccess. I hand made a sheet metal shield for extra water proofing.
I reccomend this product, easy peasey.
It worked but one of the cable restraints broke on tightening and without any measurements, I found out that it was a little tight to fit into my frame rail with the cover on.
Great product. Made rewiring my trailer a lot easier. Also makes diagnostics a lot easier.
I trouble shot bad 7-pin plug as lites blinking and one brake lite questionable. All bulky connectors, wire nuts, for new plug not an option. Saw this. Clean. Looks good. Yeah, little experience needed, however, you do not have to be an technician to use.start to finish: 30 mins. Color coded terminals not really needed, but good idea if you've never done something like this.
Could have been a little faster
This junction worked perfectly! So handy to have under your vehicle to wire up a wide variety of accessories! I used it to wire up flush mount pod lights that I installed in the rear bumper. They serve as reverse lights and they’re also wired to come on with a switch. Very handy!
extra fast and always has helpful tech
I installed box it worked out well
Haven’t gotten around to installing anything yet but, very happy with service
rewired trailer, this made the job much easier as well as secure.
Makes wiring very easy and a clean job of it.
This is a nice enclosure whether installing a new 7 way assembly or simply cleaning up and organizing the existing connections between the 7 way harness and the vehicle wiring. Good weatherproofing for installation under the trailer deck.
Per the video there was supposed to be a color coded cheat sheet included. That would have been very helpful.
Working as designed
Working as should and was exactly what the description said seem to be good quality
I had a problem with my electric brakes occasionally showing a disconnect. Talked to Carol C and she diagnosed and recommended the parts. Uninstalled them and no more problems. Tech support is on point.
Info for this part was:
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Raymond
4/29/2025
The box is still water tite, and shows no interior corrosion. Many campers have intermittent power due to loose and corroded wire nuts on low voltage systems. Especially the front jack!