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Wiring for towing can be a hassle if you have to splice into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector skips all that. It plugs inline with existing tail light connections behind the rear bumper, giving you a clean, factory-style hookup without altering any of your vehicle’s original wiring.

This harness uses a powered converter that draws power directly from the vehicle’s 12-volt battery instead of the tail light circuits. That keeps the vehicle wiring from being overloaded while ensuring full, consistent power delivery to your trailer lights. It’s a safer setup that helps prevent blown fuses and dim trailer lights.
Some trailers use LED lights, which can cause problems on non-powered systems due to lower resistance. The Curt C55367 harness handles both LED and incandescent lights with ease thanks to its powered design. It provides stable current for running lights, turn signals, and brake lights so everything functions just as it should when you hit the road.
Once installed, the 4-flat connector gives you the standard trailer lighting functions—running lights, turn signals, and brake lights—all in one easy plug. It’s compatible with most small and mid-size trailers, so you can hook up and go without extra adapters or modifications.
A built-in fuse holder and single-prong grey connector make it easy to tie into the vehicle’s power source under the hood. The ring terminal connects straight to the positive battery post for a solid connection, while the fuse holder protects your system from power surges. It’s a straightforward setup that keeps everything tidy and reliable.
The connector for the harness attaches behind the rear bumper. The included yellow wire with a fuse holder connects under the hood — one end plugs into the power wire connector on the driver side in the engine compartment, the other end connects to the positive battery terminal.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
CONGRATULATIONS !
THIS HARNESS NEAT, COMPLETE, AND A TREAT TO INSTALL.
WILL BE GLAD TO RECOMMEND TO ANYONE.
REGARDS, "SMILES"
A snap to install w/ included instructions.
Everything was incredibly easy to replace and works top notch.
Great product and instructions easy to reference.
Got the exact replacement part at a good price, and it arrived on time. Ordered over the phone e-z peezie
Timely shipping, Great product,Fair price. Excellent service. A pleasure to do business with.
Worked for about two months and 2 trailer pulls then quit working
Product installed just like it said, arrived in a timely manner well made
Easy to complete the online purchase, good value, shipped timely, product was exactly what it was represented to be and of good quality. I would do business wth etrailer again.
Worked perfectly, should have ordered this along time ago. Took me 10 minutes to install. Customer service was great too. Thanks for a great product.

Frank
2/24/2018
It shortened out and blew fuses in my truck so I had no turn signals and flashers. About a month ago I had to purchase another one and installed it. Easy to install but thought it would last longer.

The product fit perfectly as stated. Made the job very easy. My only reasons for not giving it a 5 star are 1 the kit did not come with any dielectric grease nor a picture showing where the 12v factory connection was, I found that on another site ( Its right next to the bsttery ).But as far as fit and ease of insulation I would give it a 5 star.
Good afternoon, I receive my order, but the box came in tour ripped looked damaged I’m checking to see if all the parts are in good shape at this moment.
Quick shipping. Easy installation. Haven't had a chance to use it with a trailer yet, but it appears to be working after checking it with my test light. Took longer to move the battery, route and secure the cables under the hood than to actually plug both pieces in as directed by the instructions. Total install time was about 90 minutes.
Curt trailer wiring kit has good connectors and was easy to install into factory setup on my Tundra.
Why is it when I order a 50lb hitch, I receive it in world class 1 day time. When I order 1/2 lb wiring harness it takes longer than the pony express 8 day time. Products have always been first class and shipping usually is first class as long as the wiring is ordered with the hitch.
After tons of problems and hours of install, troubleshooting and repairs to my previous trailer and truck wiring, I finally ordered the exact fit 'plug and play' version of the wiring kit to replace the splice-in type from local auto parts store. It took about 15min. total to install in the dark. Where instructions were slightly too brief, etrailers website video clarified. Lights on trailer are brighter than they've ever been, previous bad grounding problem is solved and I'm looking forward to the fuse protected circuit saving me from buying more replacement converters in the future.
Fast shipping, and the customer service was great.
Replace OEM box pretty simple worked gr eat
Product worked awesome fast and easy thank you A++++
Simple and only too minutes to install
Easy installation
Didn’t fit even though it said it was a match and customer service had no idea how to help. Their offer was straight to a refund
Had some shipping issues; however, customer service agents did an excellent job resolving them.
Perfect fit installation was flawless great product
wiring harness installed easily, fixed an intermittent problem that had been bugging me for years
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Zac
8/23/2022
One year later and everything works great. It was easy to insta and held up nicely.