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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.
docdirt
Reviewed in the United States on April 16, 2025
Wow. A tool with no instructions or markings! Hope the use/user of their other products are not considered so poorly.
staffordScott
Reviewed in the United States on May 26, 2024
It worked perfectly. I now know the issues we're having are related to the trailer and not the vehicle. Worth the few bucks to avoid the aggravation.
fl_hillbilly
Reviewed in the United States on October 12, 2024
Tested out the trailer wiring installation and worked great.
Kyle
Reviewed in the United States on January 5, 2024
It functions how it’s supposed to, but the lights aren’t labeled so you doing know if it’s wired up correctly. You have to research which light is for which function to determine anything. I ended up labeling mine with a marker, so it’ll be easier for next time.
Greg S
Reviewed in the United States on September 24, 2023
It’s compact and fits in center console, easy to hook up and easy to read.
D Johns
Reviewed in the United States on September 20, 2023
I used this to test my trailer wiring harness and I didn't have to haul the trailer out to test. Highly recommended.
Robert Pearson
Reviewed in Canada on February 22, 2023
I'm still scratching my head wondering why this wasn't invented sooner. A useful product.
Steven Clem
Reviewed in the United States on November 19, 2023
Did what it was supposed to do. Good value for what i needed it for
Mara
Reviewed in the United States on October 24, 2023
Easy way to find any issues quickly rather than going down the “trail & error” road. Great diagnostic tool. Literally plug and play.
King kong
Reviewed in Canada on January 6, 2023
It works for me thank you.
EdgarM
Reviewed in Canada on May 18, 2022
Very handy and useful, removes the guess work.
Joe
Reviewed in Canada on July 24, 2020
Not much to say, it's simple, well made and does it job quite well. Add to that the nice price, it was exactly what I needed
Ross M
Reviewed in Canada on July 18, 2017
it worked just fine. Good product.
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