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Blue Ox Tow Bar Wiring Kit - 4 Diodes

Blue Ox Tow Bar Wiring Kit - 4 Diodes

Item # BX8848
Our Price: $63.85
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Tow Bar Wiring
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Connect your towed vehicle's lighting system to your RV's to get the brake lights required for towing. Great Prices for the best tow bar wiring from Blue Ox. Blue Ox Tow Bar Wiring Kit - 4 Diodes part number BX8848 can be ordered online at or call 1-800-496-5010 for expert service.
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Blue Ox Tow Bar Wiring - BX8848

  • Diode Kit
  • Splices into Vehicle Wiring
  • Universal
  • Tail Light Mount
  • Blue Ox

Connect your towed vehicle's lighting system to your RV's to get the brake lights required for towing.


  • Connects RV's tail, brake and turn signal lights to towed vehicle's light system
  • Includes 26' long, 4-wire harness; 4 diodes; ground wire; and detailed instructions
    • Diodes prevent electrical feedback and the damage it can cause to your towed car's electrical components
  • Made in the USA
  • 1-Year warranty

BX8848 Blue Ox Tow Bar Wiring Kit - 4 Diodes

Installation Details BX8848 Installation instructions

California residents: click here

Video of Blue Ox Tow Bar Wiring Kit - 4 Diodes

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

Video Transcript for Blue Ox Tow Bar Wiring Kit Installation - 2018 Ford F-150

Speaker 1: Today on our 2018 Ford F-150, we're going to be taking a look at, and I'm going to show you how to install, the Blue Ox Tow Bar Wiring Kit, part number BX8848.What the diode kit's going to do for you, is while your Ford is being flat-towed behind your RV traveling down the road, it's going to allow you to transfer all those signals from your RV into the Ford. When it's finished, you turn on your brake lights, your running lights, your turn signals, all those are going to transfer through to the vehicle while it's being flat-towed.Now the purpose of the diodes, is to protect the factory wiring on the Ford from any back feed from the RV. And vice versa it's going to protect the RV wiring from any back feed from the Ford's wiring.As far as the installation goes, it is a pretty simple installation. You will need a light tester to test the wiring to figure out which wires are your brake wire, and your running lights, and turn signals. Other than that, all you're doing is transferring wires, running a wire from the back to the front.First thing we need to do to start our installation, is we're going to go ahead and get everything out of the package. You're going to get 12 foot of green and brown wire, and you're going to get your 4-pole wire that's going to route to the front of the vehicle.

You're going to get your four diodes, two for each taillight. Then you're going to get your female spade connectors, they're going to hook onto your diodes from your wiring. You're also going to get a butt connector, ring terminal, self-tapping screw. And then an extra white wire for your ground wire.Some of the things that you're going to need, crimpers. You're going to need, and you can just use a socket this is to get a socket wrench if you don't have a battery operated one or electric one, 5/16ths socket, and that's to remove our taillights.

You're going to need wire strippers, and you're going to need a light tester.To remove our taillight, we're going to start on our passenger side. We're going to remove this bolt, and this bolt. And we're just going to pry our light off. You want to make sure that these alignment tabs that are here, we don't break those off. Once we get that disconnected, we'll go ahead and unplug our taillight and set our light aside.Now we have a coating here.

We need to remove that, and actually if you look back here there's a little clip that's holding our wiring on. If we un-clip it, it might make it a little bit easier to work with, give us a little extra room here. Pull our wires out, pull this off a little bit more.And with our tester, we actually have our right blinker turned on right now, it's a little bit easier if you have somebody actually sit in there so you can run through all the functions at once. Now our brake signal and our right turn signal should be on the same circuit. We're just going to be using two wires.

So what we're going to do, is we have the other end of our light source, or our tester, hooked up to a ground and we're just going to push it in like this. So it's going to be our second prong, which is going to be this green wire with the orange stripe. And you're just going to do that same process for your running lights.Through testing, we determine that, as I mentioned, the green wire with the orange stripe is going to be our turn signal and brake signal. And then our blue wire with the white stripe, is going to be our running lights signal.So actually I stripped the back a little bit farther, this is a little close to your other plug. You can do it there, but I like to give myself room. So I actually went down here, I'm going to cut my wires here. It gives me plenty of room for my diodes.Go ahead and start with our, actually we can just cut them both. Strip back the ends, I'm going to add one of my spade connectors onto each one like that. We're going to do the same thing with our green wire. Take our diode, you're going to see it's going to have two ins and an out, out is going to the taillight, in is coming from the wiring. Like that, and we'll take our other blue one and plug it into one side. Same thing with this one, just like that.Then you're going to take your green and your brown wire, and if you follow it down I pushed all of it down through that hole where my factory wiring is going because the other end of this is going to be going over to the drivers side. We're going to go ahead and make these connections first though.We're going to add our spade connector once you strip back your wires. And if you remember, our blue wire with the white stripe was our running lights, which is going to be our brown. We're going to plug that in, in with our blue wire. And then our green wire's going to be our turn signal and brake lights, and we're going to plug that in with the diode with the green wire and orange stripe.Then one thing I forgot to mention, is electrical tape. I went ahead and put my wire loom back over, and I'm actually going to take these and I'm going to see if I can't tape them on here. And I'm not putting a lot of pressure on the tape, I just want to hold them in place so they're not bouncing around. Push our holder back in place. Now we can put our taillight back in.I went ahead and routed my brown and my green wire over from my passengers side. And I fed my 4-pole wiring up through the hole here on my drivers side. Now how I ran my green and my brown wire, I went up above my spare tire bracket, just ran it across the bottom of the bed basically. You just want to make sure you're staying away from anything hot or moving. I did zip-tie it to where this wire goes down to the bottom of the bed, I did zip-tie it there so it stays tight across the back. Really, it doesn't matter how you run it that's just how I did it.So now what we're going to do with our brown wire, and you remember our brown wire on our passenger side was running to our running light signal. When our vehicle's being flat-towed and we turn our running lights on in our RV, if we don't have this line or this brown wire coming from our passenger side jumping across to our drivers side, the passenger side light is the only one that's going to come on. So we need to tie this in with our brown wire on our 4-pole wiring that's going up to our 6-pole plug. We'll put them together like that. And then these will go onto our running light signal on our drivers side.Let's go ahead and strip this wire back here, this is our 4-pole wire. And then as far as our brown wire here, we're going to cut it down a little bit, twist these two together, go ahead and put on one of your spade connectors.That green wire, I'm not going to be connecting that to a diode on this side. I'm just going to connect my green wire from my 4-pole and my green wire coming from my passenger side for the blinker, together. Go ahead and cut this down, and then these we're just going to strip back a little bit, we're going to add a butt connector on them.Now your kit is going to come with a butt connector. However, I'm going to replace it with a Heat Shrink butt connector because our wiring is going to live outside of the vehicle. Go ahead and add that on to the end of our green wire, just connect our other end like that. And we'll take our heat source, and shrink the butt connector.On our drivers side we determined that this white or gray wire with that orange stripe is going to be our brake light and turn signal, and then our blue wire with the white stripe again is going to be our running lights. So then we're just going to splice them into our wiring, the same way we did the other side.Go ahead and split them. Blue wire, blue wire. Double brown. Brake light and turn signal, on your gray or on your white. Yellow and the other end of our orange and white. And our white wire's going to be our ground, strip it back, and your kit's going to come with a ring terminal, crimp that on.Now with the self-tapping screw that comes in the kit, I'm actually just going to ground my ground wire right here.Now I need to run the other end of my wiring up to the front of the vehicle. Let me get that done real quick, and I'll show you how I did it.So you can see my wire here. I went over top my frame rail, through the inside, over top of this crossbeam here, just followed my existing wiring, my factory wiring, all the way up to right here where it goes back over top my frame, and you can see it there. Just followed it all the way up to the front of the vehicle. I just ran it right along my frame rail, and you can see I ran it right up above my shock power, zip-tied it up there so it stays above it, came out to the front frame rail, just dropped it down the inside here. Now we need to figure out where we're going to mount our 6-pole plug.The only place we can really do it without actually cutting into the bumper itself, is this hard plastic that's right underneath our bumper. I did have to bend the bracket a little bit so it would sit straight. If you do it here, just remember this bumper actually stops about here so to get the nut and bolt on it, it's a short one that comes with your baseplate kit, but to get the nut up inside of there you're going to have to pull it down a little. So you can see I've got two marks where I just took a little marker marked the two holes, and then I'll put it in about like that.Now what we need to do, is we need to get our wiring through here. I like to keep it as hidden as possible. So if you see, I put on my 6-pole plug, I have my boot on, I'm actually going to drill a hole straight up right there. That way when I pull my wire through, most of it's going to be behind here.So now I'm going to give myself a little extra. I'm going to go ahead and cut this off right here, pull my plug back off, and then we'll make our connections on our plug. On the back of our plug we're going to have a rubber boot, we're going to go ahead and pull that off, we're going to slide that on skinny end first.Now if you look on the back of the plug it's going to have GE for ground, GM's going to be running lights, LT for left turn, RT for right turn. Take a Phillips or a flat head screwdriver and make sure you don't pull these all the way out because they can get lost they're small. And we'll start going around, just like that. Keep in mind that this plug does not come with this wiring kit. This kit you have to purchase this plug separate, but it can be found on our website.We're going to add some dielectric grease, which can also be found on our website. And I'm just going to kind of cover my connections here. This will help protect them, and help keep the moisture off. Slide your boot down on top, take some electrical tape an tape over the end of my boot like that. And I'm actually going to go right down the end onto my wiring. Then we can reinstall our plug.Now we're going to test out our wiring using an alternate power source. This is going to simulate being hooked up to the RV. Taillights, left turn, brake lights, right turn.That'll do it for the look at and installation on the Blue Ox Tow Bar Wiring Kit, part number BX8848, on our 2018 Ford F-150.

Customer Satisfaction Score:

Customer Reviews

Blue Ox Tow Bar Wiring Kit - 4 Diodes - BX8848

Average Customer Rating:  4.7 out of 5 stars   (99 Customer Reviews)

Connect your towed vehicle's lighting system to your RV's to get the brake lights required for towing.


The order arrived very quickly and is all intact. The (base plate) picture quality is a little poor from Blue Ox, but I talked to Angela B. and she is emailing the instructions to me for better viewing.
I might add that Blue Ox would have charged for shipping.
Now it is time for the installation.


Customer Service is excellent! The tow bar was delivered promptly and should work great. I didn't receive the wiring kit I ordered but when the company was contacted....they were great to work with and shipped another right away!!


The Blue Ox Tow Bar Wiring Kit - 4 Diodes work exactly as advertised. The diodes work to separate the harness from the system, so there is no back feed to the car's electrical system when the brakes, lights, or turn signals are activated in the motorhome. The car's rear lights are activated in sync with the motorhome lights. So much easier to hook up the "toad" to the motorhome using this harness.
Installation when very easy, after I figured out how to access the taillights on the 2019 Chevy Traverse, but now that's another story.
I would highly recommend this harness.

Im still loving it!
Dale A - 06/14/2021


Still using magnetic lights. Haven't installed wiring kit yet.


Excellent product and easy to install.

I have had zero problems with this product even after flat towing my Jeep over 20,000 miles.
Richard - 08/17/2022


Everything needed to provide motorhome lighting to the towed vehicle. This will NOT eliminate towed vehicle battery drain on long tows, and while many have a way to boost towed vehicle battery during tows, no one seems to have the reason for the battery drain. I thought the diodes would eliminate that problem.


On time and correct items.

Excellent product, great quality and perfect fit.
George - 05/23/2022


As always you sent me another great product for my RV it's always so easy with the instructions that are provided with your products and the quality is always top notch I really needed this to wire my TJ Sahara jeep for a tow dingy to drag around behind our motor home I was worried that wiring the brake lights, etc. the same as a trailer would have a detrimental effect on the jeeps wiring its nice to know that just looking it up on your website gave me all the info I needed and a choice of products Thank you

its still a great product even after a year and I am sure it will last many more years
Jim - 05/08/2018


Toughest part of installing this system was determining the best and neatest way to route the wires from front of the vehicle to the rear. Works great but does not provide wiring to run the third/middle brake light on the towed vehicle which in my case is a 2010 Chevy HHR. I subsequently opted to install a system which constantly charges the HHR battery from the RV power which allows me to keep the HHR power on so when the Brake-Buddy applies the brakes all the brake lights illuminate. Otherwise a perfectly good system with everything you need for an easy install.


We love the Blue Ox kit! Pretty simple to use.


Works perfect to connect motorhome to t ruck


Diodes where cheap had to replace

I didn’t use these diodes after I installed first one I ordered another brand of diodes wiring kit was ok . Diodes just felt cheap
Jeffrey - 01/27/2022


Went well except for instructions installing baseplate for my 2017 Silverado. After grille removal was not close to the instructions. I [looked for installation videos for] 2018 model and instructions for grill and bumper removal was right. Nice project and saved a lot on install. etrailer is great at putting together the equipment you need. Love website to research products. Have not pulled truck any where yet. [(Covid)]


Good product but the wiring diagram was difficult.

One year later and no issues. Simple install.
Jim D - 07/23/2021


As ordered. Great service from etrailer as always!


Good price when ordered, fairly easy to install using your DIY video, and works well on the tow vehicle when pulled by our RV.


Easy installation


I am new to the world of towing a vehicle behind an RV and found a lot of articles/videos on the interweb, not having a clue what to expect except what I've read and watched on the web I reached out to and Courtney B answered all my questions, removed all my doubts of what i was doing and provided everything we needed in the timeframe we needed it at a reasonable price! I can't thank her or etrailer enough!!! I will buy here again and trust in they're how to videos without question. Thank you


I was looking for a product that had everything I would need to do the job without having to go to local auto parts store to find special parts not usually stocked. The instructions were pretty good but could have been better with a couple of photos and details in the routing near the engine compartment and wire loom for added protection in the area. The finished look is well hidden as it should be and not hard to install.


Our installer did a great job installing the wiring kit; all the lights work


The wiring harness came with enough wire and everything I needed to get it ready for towing.


Easy install. One of the diodes was inoperative out of the box but etrailer resolved the issue quickly. Very appreciative of their excellent support.


Great and responsive service


Easy installation and works as expected…. Quick, safe delivery…


It was an easy install on our Jeep Wrangler. Works great.

Working great. No problems.
Jim W - 04/17/2020

Show More Reviews

See what our Experts say about this Blue Ox Tow Bar Wiring

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    Yes, for your 2013 Ford C-Max the Blue Ox Tow Bar lighting kit part # BX8848 has been confirmed as a fit. I attached a link to the install instructions plus a link to a help article page on installing kits like this.
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  • Troubleshooting Diode Trailer Wiring Installed on Vehicle Where Turn Signal Flashes Both Sides
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  • How Does Blue Ox Diode Kit BX8848 Install on Vehicle With Separate Turn Signals Taillights
    On vehicles that have separate stoplights from turn signals you can wire up a diode kit like the part # BX8848 still but what you have to do is basically make the stoplights of the vehicle function as both the stop lights and turn signals since that is how the diode kit is wired. Trailer wiring puts these circuits on same wire which is why it's easiest to do diode tow bar wiring the same. Basically your current stoplights will still function as stoplights but they will flash with the blinker...
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  • Tail Light Wiring Kit for a 2019 Jeep Grand Cherokee
    I just spoke with my rep at Blue Ox and the Blue Ox Tail Light Wiring Kit for Towed Vehicles item # BX88267 will not fit and neither will any other bulb kit. You need to use the Blue Ox Tow Bar Wiring Kit item # BX8848 because your 2019 Jeep Cherokee has LED tail lights. You can not drill a hole into the back side of an LED light as it will be ruined.
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  • Will Blue Ox Tow Bar Wiring Kit Work on 2020 Jeep Cherokee with Factory Tow Package
    Yes, the Blue Ox Tow Bar Wiring Kit part # BX8848 will work on a 2020 Jeep Cherokee with the factory tow package, there will be no interference between systems. Please note, this is not a complete setup as you'll still need the umbilical which connects the toad and motorhome. I recommend the Blue Ox 7-Wire to 6-Wire, Coiled Electrical Cord part # BX88206 for this.
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  • Diode Tow Bar Wiring Kit Installation Video for a 2014 Jeep Cherokee
    Yes, the Roadmaster Tow Bar Wiring Harness part # RM-154 would install in the exact same way as the Blue Ox Wiring Kit part # BX8848 that you have, so the video you referenced that I attached to the right would work as a guide.
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  • Comparing Roadmaster RM-154 and Blue Ox BX8848 Flat Towing Diode Kits
    The Roadmaster hardwired diode kit # RM-154 for flat towing a car will not differ much from a similar kit from another maker, such as Blue Ox kit # BX8848. But since the Roadmaster kit includes a protective wire loom and has been highly-rated by many more users, I would opt for the Roadmaster kit # RM-154. I linked a series of helpful articles concerning tow bar wiring options as well as installation videos for both kits.
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  • Recommended Circuit Tester With Buzzer And Light
    In the installation video for Blue Ox Tow Bar Wiring Kit # BX8848 you can see the circuit tester # PTW2993 being used. This is a heavy-duty tool that comes in handy when checking circuits with up to 28V. It features a light and a buzzer to verify continuity in a circuit. I have attached a demonstration video for this tester.
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  • Installation of Blue Ox Tow Bar Wiring Kit
    I suggest you use a circuit tester such as the # PTW2993 or a multi meter to identify the wires in your Jeep's circuit. Please see the attached link to installation instructions video that will provide visual guidance to installation of the Blue Ox Tow Bar Wiring Kit, # BX8848.
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  • Compatibility Of Blue Ox Wiring And Diodes With 2020 Ford Edge
    The Blue Ox Tow Bar Wiring Kit - 4 Diodes # BX8848 will absolutely work with your 2020 Ford Edge. The Blue Ox 6-Pole, Round Pin, Trailer Wiring Socket - Vehicle End # BX294-0902 is my recommendation to go along with this kit to give you the connection on the front of your vehicle. You will also likely want the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766 to conveniently disconnect your battery as required for flat towing.
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  • Will Blue Ox Wiring Kit # BX8848 Work With a 2020 GMC Sierra 2500?
    Yes, Blue Ox confirms that the Tow Bar Wiring Kit # BX8848 will work for the LED lights on your 2020 GMC Sierra 2500. Check out the video linked below for more details on this product. Note that to tow your 2020 GMC Sierra 2500, you also need a tow bar, safety cables, base plate kit, and a supplemental braking system. Here's a quick recommendation for each component: - Tow Bar: # BX7380 (includes safety cables) - Base Plate: # BX1739 - Braking System: # BLU37TR
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    Neither one of our manufacturers, RoadMaster or Blue Ox, recommend to use the bulb and socket type of lighting when flat towing a 2011 Chevrolet Mailbu LT. Usually it is because of limited space in the taillight housing that does not allow the bulb and socket to fit properly. We go by what the manufacturers recommend, since they have already done a test fit on the vehicle. The RoadMaster Diode Wiring Kit, part # RM-154, or the Blue Ox Wiring Kit, part # BX8848 is recommended for your Malibu. I...
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  • Blue Ox Diode Tail Light Wiring Kit Compatibility with 2008 Ford Taurus X
    The Blue Ox Tow Bar Wiring Kit - 4 Diodes # BX8848 will work well for your 2008 Ford Taurus X. When using the BrakeBuddy # HM39530 you won't need to use a relay or anything to change the functions. It is a simple installation with no additional fuses, bypass systems, or relays needed. You will not need to remove fuses to tow. The only thing you need is a 4-way connector to install on the wiring harness so it can plug into the Brake Buddy. Part # HMC20031 will work fine. It is recommended...
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  • Can the LED Bulb and Socket Kit # BX88267 be Installed on a 2009 Subaru Forester for Flat Towing
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  • Difference Between Blue Ox and Demco Wiring Kit for Flat Towing 2019 Jeep Wrangler
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  • Blue Ox Parts List To Flat Tow a 2016 Jeep Grand Cherokee
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  • Recommended Wiring Kit and Other Parts to Flat Tow a 2005 Jeep Wrangler
    Instead of using the # BX8848 wiring kit and adding a connector and umbilical cord between the Wrangler and RV I would use the # RM-15267 kit which includes everything. It will make the installation much easier and have a cleaner look once installed. I've attached an installation video on a 2007 Wrangler Unlimited which will be very similar process to yours. In reference to your other choices, the Blue Ox Alpha Tow Bar # BX7380 is an excellent choice and includes the safety cables. ...
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