Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2017 BMW X4
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2017 BMW X4
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring - no cutting, splicing or tapping required. Converter is made using SMT to ensure superior performance.
Features:
Specs:
Installation
This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels in your rear cargo area.
Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.
It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.
A tail light converter is built into this T-connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of the trailer. This converter combines the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.
Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.
Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.
Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.
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excellent product ,easy to install and IT WORKS!
Great product and it was delivered on time. Installed like a breeze.
Great Fast shipping, had this thing installed in 30 min. Thanks. Ryan
The product installed easily and worked perfectly. It took about 90 minutes to install.
Instructions were ok but video helped tremendously it made it easy to see what needs to be removed. Trim removal was easy, just a little time consuming. I would recommend this kit because it is easy to install, is specifically made for the Murano and requires no wire splicing.
The wiring kit fit perfectly and, although the instructions were for an older Murano with just a bit different trim details, was also easy to install. The snap together connections beat splicing wires by FAR! I also appreciated the great communication and quick delivery after the sale!
Easy to install and it works.Quality item that was a breeze to install. Wish there was a flat 5 pole plug integrated vs. having to buy/install an adapter.
As with the hitch I purchased through eTrailer, this product matched the description, and the installation matched the installation video. Another good purchase.
great product, and super easy to install. exactly the same as the nissan oem harness and cheaper in price. also great videos on installation.....
Excellent product..... Had no problem in installing ...... took about one hour to complete the project..... Video was very helpful..... everything was matched by the connectors..... Someone knew how to write excellent directions on the installation of the 55571... The video did help on one part (where to place the black box in the compartment)
Great product. Installation was a snap. A warning needs to be added to the literature stating that the trailer needs to be hooked to the vehicle if it is not independently grounded. The lights won't work otherwise. This tripped me up for awhile.
I ordered this product in 2012 - I tried to wire my trailer by myself but it did not work - I ordered this product because of the video install I watched on your site. This is one of those rare times when everything worked as advertised. Wtih the video - it took me 20 minutes to install and it worked great. This kit from Curt is excellent - they thought of everything (even a sticky pad to mount the converter to the inside wall), Nice jobe everyone - Will keep you on my favorites tab.
Video was a huge help, thanks.
One clip separated from panel but I reglued it. Used a very fine tooth hack saw blade to cut two 1/4 inch long slots, and then bent up resultant tab to get 4x1 plug through body. Tapped tap back down and cover with grease as rust preventative. Cut hole in rubber plug with X-Acto knife to seal around harness and then used RTV sealant.
Note: if you are testing the plug with a volt meter after installation, you'll be surprised to see +12V at the yellow, green and brown wires. eTrailer said this is OK. It worked fine when connected to a trailer.
The installation of the class 3 hitch, wiring harness and 4 to 7 pole connector on my 09 murano went 100% as per instructions.
your products are 100% also, I would recommend your products to anyone that wants to install themselves.
The 10A fuse was wrong size, this is why I couldn’t figure out why the harness wasn’t working.
Gwendolyn Y.
10/8/2025
What fuse did you end up using? If you don't mind me asking.
This is THE place to get your hitch !! The hitch fit perfectly , the wiring fit perfectly , the service is fantastic !! I'll ALWAYS buy my hitches and related items here. The hitch arrived so fast I wasn't ready for it. I thought it would take a week to get it , but it arrived in 2days !!!! I would not go anywhere else !! Price is great with free shipping on orders over 99.00 !!!!h Here's a pic of my hideaway hitch.
I was a little worried at first doing the install by my self, but etrailer was very helpful with their installation video.
Great product, easy to install, plug and play design. I will definitely order from e-trailer if I need any future trailer components.
I had a problem with my current harness assembly. I couldn't figure out why I could only get trailer lights on when running my headlights and nothing else. After a lot of testing on the trailer, which I figured was always a ground issue. I went out and bought a DC voltage tester (looks like a big pen that lights up when voltage is applied). It really helped me figure out where it was getting voltage and where it wasn't. It turned out that my harness module (the black box where all the wires connect to). I could tell that I had voltage going to the module but nothing coming out for turn signals or brakes. I looked closer at the module and discovered a crack in it. Not sure how or when it happened because I bought this vehicle about a year ago and the Curt towing assembly was already installed. I looked up how to replace this assembly on the internet and found a video on replacement. It looked very simple so I ordered it.
The website was easy to follow and told me exactly which part would be the right one for my vehicle. The pictures made it clear that this was the right part.
Ordering was simple. I received emails letting me know the part had shipped, and I received it in 2 days. The package came with everything I needed. Directions were easy to follow. I had everything done in a little over an hour (getting the covers off took more time than installation)
I would buy from etrailer again.
Greg
9/2/2015
Still working great
Hi Patrick. The Curt T-Connector wiring harness arrived on time a couple of weeks ago as you promised. I installed in just yesterday as I have been busy on other things.
I reviewed the Video and gathered my tools. From that point, I was done in 40 minutes!! It was very easy as you had promised. Even for me, a 72-year old with almost no memory and who moves no faster than a slow snail. The most difficult part was removing and reinstalling the Murano panels without damaging them or the clips/snaps. All done nice and tidy and I used my trailer today without a hitch (pun intended).
Thanks for a great product with really easy to follow instructions.
Bill W.
6/21/2015
Working better than expected. I like the harness and would recommend it to anyone
I purchased a hitch receiver and wiring harness. The customer service was the best I have ever received from any online retailer. I received order progress emails and received my order sooner than expected. Everything was a perfect fit. I ordered the wiring harness with connectors and highly recommend that option. I have the skills and background to splice them in but the connectors saved so much time.
Mark
Mark H.
2/10/2015
I still wish every online or brick and mortar retailer could provide the great customer service etrailer does. I have purchased two hitches and two vehicle specific wiring harnesses and after a year of use everything continues to perform perfectly. In one case I even got a call from them immediate after ordering to discuss the ball I ed. They indicated that there could be a compatibility issue and recommended ant other that would be a better fit and it cost less as well.
Everything was perfect. Shipping was fast and everything went together really easily thank you so much
Harness wired in to my '06 Murano without splicing any wires, however both turn signal wires were routed to the wrong spot in the harness. We had to re-splice each end of the harness to get the signals to work, but otherwise installation was relatively easy.
Sierra K.
11/2/2021
This item fits a 2005 Murano, but not a 2006. The part you need instead is Item # C49KR.
Product was great, easy to install and saved me money than going to a dealership and have it installed for me. Fast shipping, good price and a wonderful company. Wouldn't think twice to buy again from them. Thanks etrailer.
Edwin
5/21/2017
I have never had any problems with it since the installation. Very happy with this product unlike other hitches where you can see the whole thing. Do your research first before buying.
This is the second product I have purchased from etrailer in the past 12 months. The wiring harness was exactly as described and super easy to install. It is all just plug and go once you get to your vehicle wiring behind the taillight panels. However, the best thing about etrailer is their videos! They are 100% spot on, step-by-step, easy to follow with super clear instructions. I have installed a hitch and a wiring harness in my 2014 Nissan Murano with no problems at all!
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Jerry R.
10/6/2014
IN for one year every thing works fine ,I will put one on my next car when I buy a new one.