Arrives before Christmas To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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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. Powered converter reduces strain on wiring system and 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 in your trunk behind the tail light housings. You will have to remove the trunk floor coverings and the rear and side scuff panels to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery.
Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your trunk.
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. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.
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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Curt wiring splices into existing wires with no problem.
Electrical components work well and are durable.
Wiring, and hitch on my wife’s 2014 Scion XB, installed 2014, are still in good shape. No problems.etrailer seems to have very responsive support, except I haven’t had to use their support services but once.
This is why I continue to purchase from etrailer.
Turn signals ground out through the marker lights. To correct you have to drive with Headlights on when using trailer. Curt sent replacement, new one works same way.
This does not work on a 24 Mazda CX-30 even though it comes up in the results. Both left and right lights will blink when you use either the left or right signal. You need to buy the Tekonsha adapter, which works fine.
I’ve been lucky this year to find 2 companies that have beyond excellent customer service. e-trailer is one of them. I can’t say enough for the way they helped me when I ordered the wrong product. Way above and beyond! This is pretty much the only company that I use for this kind of products. Price and service is what sells me so being a past RV owner, I’ve bought plenty! I highly recommend this company!
This Did Not work on my 2021 Mazda CX30, it made all the trailer lights blink. Very disappointing after a 3hr install job. Curt needs to do better with their RandD. I am glad I didn’t pay a mechanic to do this. The T one kit worked correctly on my car, I suggest you go with that one.
Kate F.
11/12/2025
I’m really sorry you’re having trouble with your trailer lights Walter. That’s definitely frustrating, especially after installing a new harness. Most of the time when the lights only work correctly with the headlights on, it turns out to be a ground issue rather than a bad harness. On your 2021 Mazda CX-30 with the Curt 56450, make sure the white ground wire from the module is attached to bare metal inside the left rear cargo area, since that spot is often painted or sealed and can block a good connection. It can help to remove the screw, sand down to clean metal, and reinstall with a star washer. Also check the black power wire running to the battery to be sure the fuse and terminals are clean and tight. Finally, take a look at the trailer’s ground; if it’s weak or corroded, the lights can try to ground through the running lights, which makes them work only when your headlights are on. Please let me know if this fixes the issue.
I like the 2 inch hitch and the video i nstructions!
I'm from Canada and looked many places for this item. Sources in Canada did not have inventory, and it is hard to find a US based vendor willing to ship to Canada. The representative at etrailer was great. The process to find and purchase this item was easy, it was offered at a fantastic price and even with exchange, duty, and shipping, it cost less than the same item offered anywhere else - Canada/US. Shipping was quick with detailed tracking. Was a real pleasure doing business with this vendor. Highly recommend.
As always, great price, great product. I didn't have wait very long for delivery. Thank you !!
Quality part for my wife’s Mazda CX-5-30. Service from e-trailer is excellent. They are very attentive in every aspect of the purchase and shipping.
Curious why you need to connect to the battery directly.
have not installed item yet TKS
Very seldom do I receive this level of professionalism. I paid a fair price, and received an outstanding buying experience.
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Victoria H.
10/28/2024
Will, This is a very common issue for the t connectors if it is not grounded properly. You will want to make sure that you have the ground attached securely to the clean, bare metal surface of the frame.