Brophy Circuit Tester for 4-Pole Flat Trailer Connector

by: Greg01/05/2024

The product had all the necessary instructions and parts to make the installation very easy. The harness is very simple to use.1707985

This works just as promised and makes checking the wiring connectors much easier.1332852

John

7/20/2023

This product has performed well over the past year.

by: Brian 02/27/2024

Works exactly as expected. 1738822

by: Dan04/18/2021

Ordered hitch receiver with wiring for bike rack installation on 2019 Ford Explorer. Everything arrived in less than a week. Crawled under the car with my burly son and finished the installation in about an hour. Toughest part was getting the exhaust hangers off. Didn't have a tool for that. Online installation video was a big help. Hitch frame rubs against right side exhaust hanger, hence the four star rating instead of five. Exhaust still appears to be level and no weird noises, so not an issue. Get the little plug in light tester. It's worth it, then keep it in the glove box. Haven't purchased bike rack yet, but no concerns about the hitch.1016307

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Works great, a lot quicker than a multimeter. And not very expensive.1657923

I bought this at the same time I bought a Hopkins Plug-in Simple Wiring Harness With 4-pole Connector. It worked exactly as advertised and let me test the wiring harness installation in advance of hooking up a trailer. Both products are excellent, and the folks at etrailer exceeded my expectations in all areas, particularly the very fast response to my order. 628773

Chris

4/16/2020

Still working great and very helpful to make sure all is well with the wiring harness in the truck. Definitely still recommend.

by: Bob 12/14/2022

This tester is simple and easy to use and a great way to do a quick check of your trailer plug.1484336

by: Keith08/29/2023

Worked great 1656869

This was a relatively simple and straightforward installation on my 2019 Volvo XC40. The directions were clear, although the black and white pics can be a bit hard to follow. I would add the following points. First, the left plastic rail in the spare tire compartment needs to be removed, and it has an odd hook at the front that is a challenge. It will come with some wiggling. It's equally challenging to put back on. Second, I used the Volvo ground terminal to ground the T-One module. Third, I ran the wire from the module to the positive terminal down through a grommet in the spare tire compartment, then along the brake lines under the car to the battery. This was easy to do with the vehicle on a hoist, but will be more challenging if you don't have access to a hoist. I removed 2 of the protective panels under the car to route the wire. It was fairly straightforward. The product works as advertised and fits very well in the car.1308061

by: Larry08/02/2023

So easy to install and works perfectly 1639431

Grounding issues are always a problem with trailer lighting (in my experience), and it is great that there is a product specifically intended to provide grounding continuity from the light itself to the tow vehicles wiring. Too many systems rely on a short pigtail attached directly to the trailer and a connection at the trailer ball.

I am hopeful that this will be a long-term solution.1311157

by: Chad03/18/2022

Overall a great product. Served it's purpose. Only reason I purchased was because I didn't have a trailer immediately available to test the electrical wiring I installed on the vehicle. If you have a trailer, I wouldn't bother spending the money on this, but for those like me that didn't have a trailer at the time, definitely a must-buy. Easy to use, and can help troubleshoot any issues you may have with your wiring.1273999

Easy tester for trailer wiring harness. Made it easy to check as I installed new wiring harness and ran wires - to double check all worked before putting all the trim back in place.1331843

Great product at a good price and shipped extremely fast!1648787

This is a keeper everyone with a trailer wiring harness needs to purchase yes1452789

by: Glenn C.05/19/2020

Etrailer equipment is easy to install and gives a finished custom look. They provide instructions, videos, and guidance throughout the process, so making a mistake is nearly impossible. The performance and quality of the equipment is unequaled and function is flawless. I rarely bother with reviews, but they are deserving of my time, and potential customers should know they can't go wrong shopping here!803171

Once I had the harness installed. It was great to plug the tester in and check my work. I would highly recommend this tool.874808

Andrew

9/6/2021

Well, Ive had this little tool for a year. Now I dont use it very much, but I recently noticed my trailer lights werent working when I plugged them into my truck. The tester helped troubleshoot the problem quickly and I was back in business. So again I work recommend buying this tool and keep it in your towing vehicle. You never know when it will come in handy.

Great product to be able to test your electrical install before you close it all up and try to hook up a trailer and cross you figures it was done correctly. I was able to install my own wiring harness and use this tester to make sure everything was good. Well worth the extra few dollars.672787

Product was easy to install as shown in the videos. For my XTerra the connection into the wiring harness was hard to find. Recommend getting the tester to assure you have a good working connection and can prove you are generating voltage for the indicators, taillights, and brake lights.831146

Easy. Simple. Anybody with no electrical knowledge can use this! I would suggest
using this to test the functions (as shown in the video) immediately after attaching the plug-in harness and before you put all the pieces of trim back in place. Gotta make sure it works beforehand!661185

Products I ordered were delivered faster than expected with no issues. Keep up the great work. I would highly recommend this company. Install went great and according to on-line instructions on their website.1458835

by: Robert01/15/2023

Rock solid performance 1499986

Perfect tool for testing the wiring. Narrowed it down to the trailer lights. Already order a kit from e-trailer.1015993

by: Timothy w08/28/2022

While the product itself was excellent, the instructions were on the ambiguous side. Forget the instructions, and just watch the video to Hook Up----Suby's are so easy!!1394127

Works great. I plugged it in to my truck and tested all lights. Helped me identify that the problem was in the trailer not truck.912991