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This circuit tester plugs into the four-way trailer connector on the vehicle. The bright LED lights analyze the trailer connections and indicate which functions (tail, left turn and stop, right turn and stop) are working properly and which are not.
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hey everybody, Ryan here at etrailer. Today, we're going to be taking a look at the Curt four-pole vehicle side trailer, wiring tester. So, if you guys have ever towed a trailer before I'm sure you have encountered this problem. You get all hooked up, and kind of do a walk around, you know you kind of do a pre-trip before you hit the road. You check a few things out, one of them being the lights. And, of course, you turn your blinkers on.
Maybe you have a light out at the trailer. You hit the brakes or the tail lights and something's wrong. And then this kind of turns into a headache. You know, you're, you're checking your vehicle side, checking fuses, making sure everything's good there. Then, you get the going on the trailer side.
It's kind of just a big mess. And one thing you can do to isolate that problem is use a vehicle side tester like this. So, the way this is going to work, is it's going to plug into your vehicles four way flat connector. All right, and then that's going to isolate the problem. So, once you plug this in, you can run through all of your signals and your lighting functions.
And if they all work back here, then you know, okay something's going on with my trailer and you can focus your time on that. If you don't have all your functions back here chances are good. You could say, okay, trailer's probably okay. I probably have an issue with my vehicle side and you can focus your energy there. So, at the end of the day, if you do have an issue, it's a great little tool that can potentially save you a ton of energy.
So, whenever you are plugged in to your vehicle side, you can test the function. So we're going to have our left turn signal, our right turn signal, our taillights, and our brakes. So, since these lights are LEDs, really easy to see, even on a sunny day like today, which is convenient, especially if you're by yourself, kind of trying to, you know if you have miring stored inside you can hold it up or mount it up and check it while you're in the driver's seat, so you ain't got to get out of the car every time. But, since we don't have any labels or anything here, I figured it'd be useful to share what lighting function illuminates the light on the test, or if that makes sense. So, this light here should turn on when you use your right turn signal, the one next to it should turn on when you use your left turn signal, both of these lights should illuminate when you apply the brakes, and this one should come on whenever you have on your tail lights. So, let's say if you're, you know, testing your, your right turn signal, this one should be flashing. See, this one isn't, but this one is, okay So, you're still getting something to happen, but on the wrong circuit. So, that could help kind of direct you as well to get it figured out. You may have a short or something like that in the electrical system, and that could be looked at. So, when it comes to this tester, honestly, this is probably the last one you'll ever need, unless you lose it or something like that. Things are actually pretty, pretty stout. They're pretty solid. These are actually the exact ones we use here at the shop. And we use them day in and day out, all the time, and we've had them for years. They still work like they should every day and they really take a beating, and they just continue to work. So, for the average person to use them, occasionally, I mean this should last for the life of your vehicle or the life of your trailer, and then some. So, really nice, you know, it does have a key ring holder on the top there. And what we do, here at the shop, is usually put a zip tie or some type of key chain on there just to make a little larger so we can hang it up. If I had, you know, if I was going to keep one in my personal vehicle, something like that, you know, I'd probably end up using a key chain with my trailer lock and everything else on it, throw it in the glove box, so you always have it. So, it's a little nice touch and something I thought was worth mentioning. So, as I mentioned, this could work for your four way flat type connectors and it just plugs right in, just how you'd plug into the trailer side. And if you have multiple vehicles or different trailers, things like that and you need a different type of tester, not a big deal. We offer other ones as well. Whether you have a five way or a round seven-pole something like that. There's going to be a tester similar to this available here. That way you can use it for that wiring as well. And that'll finish up our look at of the Curt four way flat trailer, wiring tester..
Average Customer Rating: 4.8 out of 5 stars (1543 Customer Reviews)
Bought this tester to get to the free shipping threshold as I recall, but no matter, this is THE fast and easy way to test the vehicle side of your trailer harness. I use it before every tow. This way if there’s an issue I know it must be with the trailer wiring. Small price to pay to save what’s left of my sanity lol.
This thing is cool. I saw it on one of the etrailer Subaru videos. Figured why not. It’s $10 for solid peace of mind. Plugged it in. Tested the lights. All is well. Thanks!
Picking up a trailer in another state and need to check my new installation beforehand. It work's, now I'm ready for trip and safely bring my trailer back.
I could not be happier with etrailer. They offer excellent products, with excellent customer support. They really stand behind their products and make sure their customers are completely satisfied. Great company to do business with
Extremely useful, especially if you don't have a trailer handy for testing your wiring.
Made fast work of testing the lights on the wire harness.
Great little tool to have!
Great and easy way to quickly check for proper operation of the trailer lights.
Of all the stuff that I purchased this worked the best... although didn't know the same light would light up for both blinkers. Much better for checking vehicle function ....
Very handy and works great! A super easy way to check that the wires were connected and installed properly. Be careful not to lose it since it's so small. I've got a 2016 subaru outback. In the video you can see I'm testing the brakes twice, then the blinkers, then the headlights. Super awesome little tool!
Nice to check work with before putting all things back together. Also, nice to have to check line periodically, for normal function from time to time.
I WAS GOING TO GET A HITCH FROM ANOTHER COMPANY THAT SELLS AND INSTALLS HITCHS [AND RENT TRUCKS AND TRAILERS]. THEY MADE IT SEEM THAT IT WOULD BE DIFFICULT TO MYSELF, AND THEN I DID SOME LOOKING ON YOUR WEBSITE, AND WATCHED YOUR VIDEO. YOU SHOWED STEP BY STEP ON WHAT DO. TOLD ME TO LOOK FOR WIREING HARNESS THAT HAD A PLUG TO PLUG YOUR WIRE TO. EVERTHING WAS JUST AS HE SAID, IT TOOK ME 1 HOUR TO INSTALL HITCH AND WIRE HARNESS, SAVED ME AROUND $[XX], THANK AGAIN.
Great tool
I have purchased several items from etrailer in the past. Most recently, for my 2018 Jeep Wrangler. I installed the hitch, mounting bracket and wiring. All worked perfectly and the instructional videos and on line support are outstanding. I only think of etrailer when looking for trailer equipment. Thank you.
I really don't think I needed this for a new install but now I have one to eliminate the vehicle as a electrical problem when trouble shooting wiring going to a trailer. I did test my Flat connector after installing a wiring harness from Curt.
Very good product for very little money. A must have for anyone with a trailer.
Makes testing the electrical connections easy
Quick way to test connections!
Had it for one year now. Works as expected. Would recommend.
There aren't any instructions with this. I plugged it in and could figure it out by turning on: left turn, right turn, push brakes, flashers, headlights, but would be helpful to have something just telling you how it's *expected* to behave.
Nice little inexpensive test plug to have around to confirm a tow vehicle's 4-way trailer hitch wiring.
The Draw-Time trailer hitch went on without a "hitch". The process of ordering the correct components (hitch, wiring harness and 4 pole plug mount) for my 2016 Ford Flex was nearly effortless with only one call to clear up one concern. etrailer's videos that were vehicle and product specific made for a great experience. Thanks
Workers great, easy way to ensure you installed wires properly. And to make sure they are working before a trip.
Made checking my connection very easy
Worked as expected
Was very helpful when it came to diagnosing error and making sure everything was working as it should. Highly recommend.
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Gary S.
4/15/2024
Great for checking lights prior to journey.