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Transition with ease from a 4-way to a 5-way trailer connection with this Curt Trailer Connector Adapter. Perfect for vehicles needing that extra connection for reverse lights or trailers equipped with surge brakes. Just plug the 4-pole connector into your vehicle, splice the additional blue wire to the reverse light circuit, and you're set for a seamless towing adventure.
This adapter is crafted from durable molded plastic designed to resist corrosion, ensuring long-lasting use and reliability. Drive through various weather conditions without the worry of your connection failing due to rust or wear.
No need to be a wiring expert! With its simple plug-and-lead system, installation couldn't be easier. Connect the harness to your existing 4-way connector, and wire it up – you're done. It's designed to make the setup process a breeze for anyone, including novices.
Address the oft-overlooked safety aspect with additional wire leads for reverse lights in this adapter. Improve your drive safety and effectively manage tricky driving situations, knowing your trailer lights respond with precision.
With an easy-to-understand color-coded wire configuration, this ensures that hookups are straightforward: Green for right turn signal and brakes, Yellow for left turn signal and brakes, Brown for tail lights, Blue for reverse lights, and White for ground wire.
Designed to adapt and serve, this single-function adapter is your go-to for varied towing scenarios. Whether it's connecting your boat trailer to your car or adapting to an upgraded vehicle system, this adapter is built for versatility in every journey.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today on our 2010 Acura MDX we're gonna be installing Curt's four way flat to five way flat trailer wiring adaptor. This adapter's gonna allow you to take your four pole wiring on your MDX, and convert it to five pole wiring. Five pole wiring is a lot less common than your four pole wiring, so you typically don't find kits out there that just install straight five pole wiring. But if you're trailer does have a five pole, and you need this simply plugs in. And to get those reverse lights working you can take blue wire and route it your reverse lamp circuits on your vehicle. It comes with wiring, and quick splice to get that connected.We'll begin our installation at the back of the vehicle with the lift gate open.
We'll need to connect the reverse lamp circuit wire. Now the one that comes with your kit isn't gonna be long enough to reach your connector, so we're gonna have to extend this. You can pick up additional wire here at etrailer.com. We'll access our reverse lamp circuit located behind the grommet here in the upper left behind our lift gate. You just wanna take that, and pull that back to reveal our wiring.And we want the small brown wire that's in here.
This is gonna be our reverse lamp circuit. Now that we've got our brown wire separated from the rest of wiring we'll slide the quick splice that comes with the kit over the brown wire. Just like that. We'll take our new wire, slide it into the other end of our quick splice there, and then use a pair of pliers or channel locks to crush the splice down into the wires. After you've got it crimped down just close your plastic in there, and we can reinstall our grommet.It's not a bad idea to maybe poke a hole in here, and you can feed that wire out through that hole.
So, we're just gonna take a small screw driver here. Try and stay towards the bottom. Poke a hole through it with our screwdriver then we'll take the other end of our wire and we're gonna poke that from the inside out through that hole. And you can further seal that up with a little bit of black silicone. If you need some silicone you can pick some up here at etrailer.com.We can then take our wiring, we're gonna route it down to our four pole connector where ever you have that mounted.
Our customer has his mounted outside the vehicle, so that's where we're gonna be routing it. If yours was inside the vehicle then you could simply come down and just wrap it around the weather stripping down here below. Once you get about that far I'm just gonna pull back the weather stripping, and we're just gonna follow the weather stripping down. Now if you're going outside we're gonna keep following that weather stripping down bringing our wiring along the way until we get about here where we can go down through the open seam underneath our weather stripping. And here you can just reach up behind the bumper, grab that wiring, and pull it down. Then you can just push the weather stripping back into place. If it does get up above your panel here you can kind of pop that up, get it tucked back under.Now we're under our vehicle. We've got our wire that we ran down. We can go ahead and trim off any excess that we've got there. Want to make sure we got some so we can connect it to our blue wire here, so we're just gonna trim that up about there. Now we'll take our blue wire, we're gonna strip it back. We'll take the wire that we ran down, we're gonna strip it back as well. And now we'll crimp the two together. Now you're kit doesn't come with any crimps. We're using a Heat Shrink Butt Connector for ours. And again our customer has his wiring routed outside the vehicle where typically on your MDX it's gonna be inside. If it was inside the vehicle you likely wouldn't need to extend the wire longer like we did. So, then we'll just crimp the other end on to our white wire, and then we can heat shrink it down.Now we can take the excess, we're gonna zip tie that to our four pole wiring. No zip ties come with your adaptor, but you can pick some up here at etrailer.com. Now everything's all connected, and all we need to do is plug our four pole end into our four pole flat on our vehicle, and plug our additional circuit in right there. And you're ready to now plug up to your five pole connector on your trailer, and hit the road.Now we can test everything out. You can either plug this into your trailer to test it out, or you can use a test light like the one I have here. So, we're gonna hook our ground up to the exposed terminal there coming out of our connector. I've got the hazard lights turned on as well as the headlights, and that'll be able to check all of our circuits except for the additional one that we ran which is for our reverse lights. You should have on your brown wire a taillight circuit that'll come up solid. Our yellow and green wires are our left and right turns signals, so they should be flashing with our hazards. These also double as your brakes. And lastly we have this one here, we'll have to put the vehicle in reverse in order to test that. So, you may need some extra assistance because you don't want to be back at the back of the vehicle when it's in reverse with nobody inside. And you can see our reverse lights are working properly.And that completes our installation of Curt's four way flat to five way flat trailer adaptor on our 2010 Acura MDX.
Used my 4-5 pin adapter to tow my 20 foot Mako to the ramp here in East Boothbay this past weekend. I am always pleased with the wide array of products etrailer stocks that help keep me on the road.
ABOUT AS EXPECTED
Perfect fit and application
Quick install, highly recommend the ada pter.
I bought this product a year ago. My car was wired for a 4-prong utility trailer and last fall I purchased a small 5-prong motorcycle trailer that I intended to pull with my very small car. I needed this adapter to make everything work correctly on both units. It's perfect. The folks at e-Trailer are always super helpful and they pointed me to this one right away, knowing exactly what I needed (I had no clue - I'm a novice!) Once again, both the staff and the product came through for me 100%.
Pat 
10/24/2022
Still 100 satisfied a year later. Great product and company customer service is commendable.
I cannot give this item a fair rating as the trailer lights on my 2016 trailer do not work. The trailer is in absolute MINT condition so no problem there. I had the wiring checked on my 2011 Toyota Siena, everything there checked out A-OKAY, but when I attached the adapter to my Van/Trailer wiring, nothing, no lights. I talked with a gentleman from etrailer but he was of no help and not able to offer a possible solution. The wiring harness was installed on my Toyota three years ago for a different trailer that took a 4-way flat to a 4-way flat and worked flawlessly with that trailer.
Mike L.
5/15/2018
Anytime theres a trailer wiring issue, the first step is to narrow down where the problem actually is. Use a circuit tester like # 40376 or a multimeter to test each pin on the trailer connector as a helper applies the brakes, uses the turn signals and turns on the headlights. This will confirm the functionality of the wiring harness on the vehicle. Next, plug in the # C51787 adapter. Test each pin on the adapter as its function is activated. If all checks out okay, youve ruled out the vehicle and the adapter as being the problem, which leaves the trailer. Weve seen wiring problems on brand-new trailers, so its entirely possible that the problem could exist on the trailer, regardless of its overall condition and appearance. To test the trailer lights independently of the tow vehicle, you an use a 12 volt battery. Ground the battery to the trailer frame, then apply power from the positive battery post to each pin on the connector and see if the lights for each circuit illuminate. Ill also link you to some Help articles about trailer wiring. One article will help you understand the basics of how a trailer wiring system works, the other helps with basic troubleshooting. https:www.etrailer.com/faq-wiring.aspx
Great design and quality. Now I just need to figure out where to tap into the backup wiring on a 2021 Sienna so that I can use this to trigger the brake lockout solenoid on my trailer when backing up.
Barry B.
4/27/2022
Still works great after a year. And I did figure out how to connect to the backup wiring in the tailgate so my trailer brake lockout works too.
Works as intended. Easy to wire up. Just splice the blue wire into your vehicles reverse light wire and your good to go. Works great for my boat trailer with led brake & reverse lights
EXCELLENT PRODUCT.. Re-wired my trailer with LED and reverse lights; not realizing, these lights come with an extra plug. The converter adapter was exactly what I needed. Tried to just splice the wires together...naw, bad idea! Use the adapter; it works.
Fast delivery excellent communication , rare these days. Fits perfect .thank you
My newly acquired boat trailer(previously owned) wiring hookup didn’t match my SUV wiring connection so I purchased this adapter. Working very well thank you.
Installed on a 2017 Jeep Wrangler unlimited. Product arrived as stated. Easy to install took abou 10 minutes. I have pulled my boat several times lights work and the main reason was to dis-engage the surge brake when in reverse. Works great!!
Awesome and fast great products
Just what I needed to get my surge brakes from engaging on uphill backups! The video for my 2019 Highlander helped immensly. Toughest part was wiring tot he reverse light circuit but once that's done no more surge brake "backup" headaches.
Product as specified on eTrailer site to solve a particular problem between my car and a boat trailer. Excellent description and instructions.
Products were exactly as described and work great. Had all the accessories I needed and showed up on time. Also came with detailed instructions on how to install! Will.use them again.
Seems to be exactly what I needed for converting my four pole vehicle side to a 5 pole trailer side. The installation video was very helpful.
I purchased one of these and it was exactly what I needed except I messed up the install so had to order a second one. Before I'd ordered the first one, I'd contacted them looking for a solution for my specific situation and their answer was very thorough and clear. Great customer service. Highly recommend working with this company. Their products are high quality and fairly priced.
Great products. Grt service also I have bought from etrailer b4 and always been happy
Item delivered ahead of schedule and exactly as advertised. Adapter is a real problem solver. Assistance by sales staff was fast and professional.
very handy converter! Will only shop at e trailer they ARE the best
YOU GUYS ARE THE BEST..............Easy to deal with and reliable! Thanks!
Excellent product. Exactly what I needed to hook up my five pole trailer to my four pole truck.
Leonard E.
5/9/2021
Still working as well as it did on day one. 5 star product.
Just what I needed to wire my new boat trailer to my truck.
Hugh H.
8/8/2021
Works perfectly. I like its tight fit for a great conection
great !!!
Bryan
9/11/2019
Still working perfectly!!
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Frank
9/25/2024
just fine I trust etrailer to have what I need