Arrives before Christmas 
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You're sorting out a trailer light issue and don't want to rip everything apart. This loop lets you test wiring fast. Plug it in, check the LEDs, and see what's working. Saves time and frustration.
This 4-way flat loop gives you a quick way to connect trailer wiring or test circuits on the vehicle side. The LED indicators light up when power is detected, so you can verify function at a glance. Use it for diagnostics, wiring checks, or as a short lead for custom installs.
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi, everybody. Andy here with etrailer.com. Let's take a real quick look at this TowSmart 4-Pole Loop with Wire Tester. Now this 12-inch extension is going to give you additional length to bridge gaps between your vehicle's and trailer's wiring connectors, which is especially useful if your standard wiring falls short. As you can see here, we do have a tethered cap here that's going to protect the tester side contact points there so you're not gonna have to worry about dirt, debris, or moisture affecting those when it's not in use. So this does have an integrated wire tester that's going to allow you to quickly verify that your trailer's lighting functions are all working.
Now I want to just show you what that is going to look like, so I do have a tester here. I'm gonna plug this in, see if I can do this real quick for you. Okay, so I think I'm plugged in, and then I'm gonna flip this over so you can see the tester itself, hopefully you can. And so I'm going to hit the tail lights first, so you see the tail light is lit up, and then that is going to be the left turn, and so the LT there is flashing, there's the brake lights, and then there's the right turn. So this is going to be very easy to test and see, so right turn, brakes, left turn, tail lights, and we're good.
So it's nice that that is integrated in there. It's gonna be all in one piece here, so this is a one-piece construction, and I think it's gonna hold up really well for you. It's gonna be a simple item to use but very handy. So if you do pick this up, we'd love to hear back from you regarding your experience with using this, how it's working out for you. You can share your experience with us by dropping a comment or leaving a review on this product page, and if you have any other additional questions, don't hesitate to reach back out to us.
Well, that's gonna wrap up our quick look today. I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.
This product is exactly as advertised. Have tested my connections from my vehicle and it works just fine.
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Lazer S.
9/16/2025
Glad to hear it's working well for you, Kenneth! Always a good thing to be able to check and make sure everything is working properly!