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Your cart is empty.Part of towing responsibly is making sure your trailer lights are working properly. Whether you have just installed a new custom wiring harness or are trying to locate the cause of an electrical problem, CURT connector testers are great for testing tail lights, turn signals, brake lights, ground connections and other electrical components on your vehicle. A connector tester works by plugging into the connector socket on your vehicle and responding to the various electrical signals produced by pushing the brake pedal, signaling a turn, turning on the running lights and so on. When the socket is getting proper power, the tester's various LEDs will light up corresponding to each wire in the connector. Testing your vehicle-side socket is essential after installing a new custom vehicle-to-trailer wiring harness and is highly recommended every time you hitch up to tow. Also, if you are experiencing electrical problems with your trailer, a CURT tester will be able to tell you whether the problem is rooted in your vehicle's electrical system or if your trailer needs some rewiring. All CURT connector testers come with LED lights to be bright and long-lasting. Wire testers are available for 4-way flat, 5-way flat, 6-way round and 7-way RV blade connectors. This particular electrical tester fits a 4-way flat socket and comes with quality plastic construction.
Koots
Reviewed in Canada on May 6, 2025
Good 4 pin tester quick and easy
PJake
Reviewed in Canada on May 22, 2025
Works perfect!
John J
Reviewed in the United States on January 12, 2025
Good looking but mechanic didn’t need to use it
Jeremy C
Reviewed in Canada on April 8, 2025
As described, and simple to use. Lights up different when left, right, brake and parking light engaged. Only thing is you'll need another person to check in the back to confirm.
Neil I.
Reviewed in Canada on September 27, 2024
good basic easy to use item
Richard Mahar
Reviewed in the United States on September 1, 2024
Worked great for checking trailer lights
Bobby H.
Reviewed in the United States on March 12, 2024
Glad I found this item. Thought I was going to have to change the wiring harness on my trailer. Found out it was harness in the vehicle. Easy to use, I just set up my phone on video at the rear of the vehicle and sat in the car to test the break and blinkers. Super easy to use.
F1eric
Reviewed in the United States on October 18, 2024
Curt makes excellent towing gear, and this socket tester is no exception. I’ve used other Curt products, and they just work.
Rick Thibault
Reviewed in Canada on September 4, 2023
Plugged it into two different vehicles and got no lights. I cut the ground lead insulation flush with the pin as in the picture and noticed the inside was looking odd, almost rusty brown. I took a 3" spiral ardox nail and cleaned it a bit though you could use anything that fits in. Plugged it into a vehicle and voila I have lights.Now the issue that seems common in the reviews is needing 2 people to check if the lights work and what lights mean what. Plug the unit in and turn on your lights and hazard flashers. Walk to the back and you will have 1 light on steady and 2 lights blinking. If all the lights work you have operating trailer lights. To make sure it is wired correctly turn off the hazards and put your right blinker on, the LED on the right should be blinking, if so, everything is correct.This unit is to make sure YOUR VEHICLE lights are wired correctly NOT YOUR TRAILER lights.I have had Curt hitches and wiring kits installed on 3 vehicles and never had any issues over many years. I am a little surprised that I had a small problem with something as simple as a tester but in the end an easy fix. All's well that ends well.
TP
Reviewed in the United States on October 26, 2022
Works perfectly. Great, inexpensive way to test your trailer light socket. I'd give it 5 stars except, it comes with zero instructions or markings on the tester, as to what each light means but, there are plenty of reviews that explain this. Great little tester.
Andrew Kim
Reviewed in the United States on July 11, 2020
Most of the curt trailer wiring does not come with a tester. So if you have to test it before attaching your trailer (u-haul, budget, home depot), then you're cutting it close if you need to do any repairs to your electrical wiring system.This exactly served it's purpose. During my move, I had shifted a lot of boxes and dislodged some of the electrical wiring. This little gadget helped me diagnose exactly where the problem was (loose electrical wiring with poor crimping) in the parking lot of my hotel. Having it was incredibly useful and doesn't take up a lot of space.This little guy is staying in my car as long as I still need to use a 4 pin connector for trailers and hitches.Value: 5/5Usefulness: 5/5Ease to install: 5/5Would recommend to a friend who wants to test a working 4-pin connector, attaching wiring for 4-pin connector, or for anyone looking to put a trailer/hitch on in the near future.
James Bauer
Reviewed in the United States on July 16, 2019
I highly recommend the CURT 58260 Vehicle Socket Way Flat Towing Tester 4-Pin Trailer Plug to test your wiring once you have installed the wiring harness if you are a DIY guy. Plus, you can route it into the passenger compartment, lay it over the back seats and actually know if you did made the right connections while driving around without the trailer. On an old hitch or trailer, as a diagnostic tool, it saves time and cursing, as it just plugs in to the hitch wiring. If it works, you know your problem is on the trailer, which, by the way, if it isn't a rusted to death bulb or socket, is almost always the ground. Look by the hitch for a green wire and give it a shake. Worth every penny of the two dollars it costs. I would buy one for each car and trailer I have. My only complaint, as for a first time user, is that there is no orientation as to what is left or right/driver or passenger side as you can invert it easily. The tab goes on the top and the plug goes in the bottom.
Caveat Emptor
Reviewed in the United States on June 12, 2018
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