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Circuit TesterItem # TR20117
Our Price: $19.52
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A circuit tester that plugs into the 7-way trailer connector on the vehicle and emulates a trailer. The lights let you know what functions (brake, turn, tail, stop, reverse and 12V) are working properly and what functions are not.
Features:
Note: Designed for use with Tekonsha and Draw-Tite aftermarket brake controllers and Ford OEM brake controllers. May or May not work with other manufacturers brake controllers.
Installation Details 
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Video of 7 Way Trailer Connector Vehicle Tester
Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.
Today we're going to show you the 7-way trailer connector vehicle tester, part number TR20117 from Tow Ready. All right, this is a handy device to keep with your vehicle. You can use this to test your vehicle any time. For instance, you have a problem with your trailer, you're not too sure where to start. Go ahead and use this tool in your 7-pole connector in your truck to verify your truck is working fine, then you know it's on the trailer side. Now the indicators are going to be these LEDs right here.
They have their own markings. TM for the running light circuit or trailer marker lights. LT for left turn, twelve volt power supply, so something in your trailer may require twelve volts like the interior lights or something like that. BK for the output from your brake controller. BU for your backup lights, reverse lights, and RT for your right turn signal.
And bye the way, with the brake controller this test was actually designed for use with Draw-Tite or Tekonsha brake controllers, and also the Ford OEM brake controller as well. This may or may not work with other brands of brake controllers out there. Let's go ahead and plug it into our truck here and show how it works. Just like any other 7-pole connector, you just push it in place. Make sure it's fully installed. You can see where I already have a couple of lights showing up.
One's going to be four a twelve volt power supply, and one's going to be for a brake controller outlet. All right, in this case our brake controller sends out a small trace current to look for a completed circuit, so that's why we have it lit up already and we're not even using our controller. That's perfectly normal. Okay Let's go ahead and try the running light circuit next. All right, that's our indication for the running lights.
Let's try our left turn signal. Okay. Now let's try our right turn signal. Okay. Let's look for our brake signal, which would be indication on our left turn and right turn signals. Okay. All right, and now we'll go ahead and try our back up lights, which we will put the vehicle in reverse. That will finish it for part number TR20117, the 7-way trailer connector vehicle tester from Tow Ready.
Average Customer Rating: 4.7 out of 5 stars (107 Customer Reviews)
A circuit tester that plugs into the 7-way trailer connector on the vehicle and emulates a trailer. The lights let you know what functions (brake, turn, tail, stop, reverse and 12V) are working properly and what functions are not.by: Rick M.05/20/2017
I am very happy with the 7 way tester, TR20117, and used it to determine that the add on extender the RV dealer instakked on my 4Runner they hitch was changed had a loose a connection. I was able to use the tester to easily determine that the missing running lights were due to the 7way connector extension. I disconnected the extender and was able to stretch the original line to the new hitch. All is working well. I originally ordered a Brake line and connector for my trailer and that was a UPS fiasco of no fault of etrailer.com. I live in the country and gave them my street address thinking UPS would deliver there. They dropped the package at the wrong post office and of course my address was not deliverable. After giving my PO box number as the delivery address UPS again dropped it at the Post office to get it to me. This appears to be a new delivery method for those of us with PO boxes. Needless to say I ordered the second part because etrailer did so well in locating the problem change with UPS delivery. 383113
by: Bill_OldGuy08/10/2013
The product wasn’t very useful for my application. I have an OME installed trailer kit which has an isolation box between the vehicle and the trailer connector. I could tell the turn signals worked and that the electric break controller was working but everything else caused the LEDs to glow with what looks like high impedance semiconductor leakage regardless of whether the light was off or on. There just not enough load in the tester to bleed off stray voltage. I went old school with two clip leads, a 12 v bulb and an ice pick to verify that the vehicle was functioning properly. I have no confidence in what the tester indicates when the LED glow and whether the trailer connector is working or not. This will probable work if you only have copper between your vehicle lights and your trailer connector. 94367
by: Roadkill07/09/2013
This 7 Way Trailer Connector Tester does Exactly what I was hoping it would do. It clearly indicates which electrical function is working on the Vehicle. I rated this "Very Good" rather than "Excellent" for ONLY one reason. When looking at the indicator lights on the tester they DO show which function is operating. What "might" be a little confusing to some is the fact that the indicator lights to not match exactly to the location of each tab inside the plug mounted on the Vehicle. Had the indicator lights on this tester match each location inside the plug I would absolutely have given this an "Excellent" rating. I still feel this is a Very Good tool for testing the wiring to insure each function is working properly. 88545
by: John E.09/10/2015
Great function and fit. I'll keep this in the glove box in case there are any issues. 224842
Everything is working fine, although we dont get out to use it as much as wed like :
John E - 09/14/2016by: Thomas DiBartolomeo11/05/2013
The product is good with the STANDERD trailer hook up, But it does NOT work on my 2013 chevrolet 2500 inergrated braking towing controller ( IBTC ) When you hook the tester to the plug and apply the trailer brakes all you see is one Blink on the tester and then it goes back out. Now I took my New 2013 truck to the dealer and they checked the braking system and found Nothing wrong and said it was OK . Please test this on the 2013 chevrolet 2500 ( IBTC) and you will see what I mean and please if there is anything that I have done wrong please contact me because this tester does NOT work on my NEW truck .....Please respond ! 106348
by: Billy C.06/09/2015
works well was satisfied with Item and on time delivery. 202044
Works Great, use it often
Billy C - 06/16/2016by: Michele G.02/04/2015
This item was extremely helpful in my recent purchase of a tow vehicle. I had been looking at used trucks and brought this to determine if the wiring in the tow package was in working order - come to find out the 12v light wasn't coming on so I was able to tell the dealership I'd buy the truck if they'd be sure to fix it. Turns out it was only a fuse so an easy fix. I believe this will come in handy from time to time if I find anything not working on my trailer (will know if it's on the truck end or on the trailer). Thanks eTrailer for a FAST delivery and great product. 172361
by: John G.10/24/2013
Great tester 105004
This tester is fantastic!
John G - 10/24/2014by: OK04/30/2015
At first I was very disappointed in this product. I put it in my 7-way plug and the LEDs were facing my vehicle so I couldn't see them at all. Turns out you can loosen a set screw and rotate the LEDs to point in a different direction. Once the happened it was better. I found the LEDs were hard to read in the sunlight but it did its job. Also the pulls tabs on each side are so big that it makes putting the tester into the plug difficult in certain situations where there is not very much space like on my minivan. 188960
by: Mike s Lawn Service02/10/2014
With this product I was able to narrow down my electrical problem to my truck and not the trailer, and by knowing that the problem was the truck I was able to narrow down the problem down to a 1 foot long piece of wire behind the tail lights but before the outlet. I did all this by simply looking at the tester and following the wires with my eyes. This tester saved me several hours of time, money in parts I didn't need and not to mention the immeasurable frustration caused by trying to find electrical wiring problems. 116192
by: Bill K.10/03/2016
This very simple device makes it easy to verify if your vehicle wiring is doing what it is supposed to be doing with the trailer lights and electrical needs. If your vehicle isn't providing the right power, stop looking at the trailer wiring! This narrows down the search for that loose wire or fuse instantly. Verifies everything is okay instantly. It's simples, rugged, and easy to stow in the vehicle to help you or others with trailer wiring issues. Highly recommend this to others. 302755
by: PatM06/23/2015
This product (TR20117) helps with verifying that vehicle outputs are correct. If the vehicle is good you are ready to troubleshoot the trailer. I use a small 12 volt battery and two leads with alligator clips to test each function on the trailer. Etrailer has excellent wiring diagrams and diagnostic information - in addition to excellent pricing, great service and delivery. Hope this helps.... Pat 206576
by: Henry S10/01/2016
This is the 3rd time I have ordered from etrailer. Very satisfied with the products I have purchased, the timeliness of the order being processed and the follow-up on the order. As I am looking to purchase a couple of more trailers to rebuild, I strongly suspect I will be using them very frequently---ESPECIALLY when I save nearly 50% as compared to local dealers! 302349
by: Leon C.05/13/2014
I received my 7 way tester fast , and it was packaged well. it came in handy to test my trucks plug to find out it wasn`t getting any power. when I found out what the problem was it was real easy to look at the lights on the tester to see they were all working rather than hooking the trailer up and keep running back to the trailer to check if they were working. 130500
by: James Norton12/27/2012
I had used the product before. While performing the testying of my camper/truck lights several family members were amazed at how easy this product was to use for trouble shooting problems. As a result, they asked me if I would get them that for Christmas. Personaly, I couldn't have been more pleased with the product. 62060
by: Kenneth R01/12/2011
Great Service My order was filledfast, with great followup and tracking. I'd have no problems ordering from you again. I used the truck, trailer plug tester at a local RV dealer and just had to have one. TThis way I can test all my lights, brakes before pulling the trailer from the shed.Thanks K.R. 5398
by: Alex02/12/2015
Works as expected. Would like more clear marking as to what circuit is energised. Used it to check vehicle connections that mechanic said were working. Guess what they were not, no signals no brake lights and no running lights. Going to take it with to show him when i return. 173485
by: joel b09/15/2013
Great product. Figured out the problem I was having in minutes instead of going back and forth with the trailer. I do think the lights could be more obvious. Just show one light if working. Instruction sheet wasn't included. Support got it to me immediately though. 99986
by: Speedy05/12/2011
This 7 way vehicle connection tester works great. I'm able to trace any poor or bad connections associated with my truck's trailer harness quickly. Low cost and quality design makes it a great tool to leave in the trucks toolbox in case I have future connection issues. 13733
by: Dusty R.01/14/2011
Fast and what I needed The product arrived super fast and was exactly what I needed to fix lighting issues on my trailer. No longer did I have to wire and rewire the connector to find the right places for the wire. Cut the working time down drastically. 5471
by: Rider09/18/2012
The tester works fine, but the LED lights on the tester are arranged in a confusing manner, the lettering indicating which LED light is on are very small, but overall, it will be a good tool to help test the towing vehicle electrical trailer circuits. 55071
by: David03/05/2013
Tester made all the differents in the world, my wireing harness had been cannibilized, so I needed to make a good water tight connection under my truck. The juction boxes were the ticket, making a professional job oit of it. Thanks etrailer 68853
by: Ed B.05/11/2011
I have only used my tester twice, it worked great! My connector on my truck was hooked up right. My bosses was not. It was nice to be able to just plug it in w/out having to hook up a trailer. It is a great compliment to anyones toolbox. 13556
by: Doubletake Trailer Sales06/12/2016
It would seem the product is exactly what it is advertised to be. It will be handy for us when customers pick up trailers to be sure it is the tow vehicle and not the trailer. Hopefully it will last a long time. Easy to read and use 260642
by: Ron01/04/2017
The 7 way trailer connector tester works great. No guessing about the wiring because you just plug it in and the lights will light up showing the connection corresponding with the light on the connector tester. Saves a lot of time. 329830
by: TopDown Bruce09/05/2016
A great tool to check your truck's trailer linkage. It provides LEDs for lights and the brake function, thus confirming proper truck-trailer plug configuration in a compact tool. The item is as shown in the dealer provided photo. 291511
by: J-E12/14/2013
This vehicle wiring 7-way tester arrived in three days and works perfectly. The circuits are clearly marked and the LEDs are easy to see in the bright sunlight. Thanks Patrick! Excellent product and service! J-E 110125
by: PAMike06/28/2012
Helpful. However, it does not put a load on the signals, so if you have a weak 12-volt or ground connection to your trailer-light signal converter, it will still indicate that the system is working properly. 45992
by: SCDuck12/15/2015
If you are not 100% comfortable wiring a connector to your tow vehical, get one of these when you order your connector parts. It is dead simple to use and seems to be made of excellent materials. 233839
by: Larry05/28/2017
Product works well but as others have mentioned, the red LED lights are hard to see in bright sunlight without cupping your hands to block out the sun. Otherwise this good product would be great! 386043
by: Richard A04/03/2014
Used for monitoring five church vans to insure proper working order before leaving on youth trips and mission trips. Really appreciate the the item when having no second person to assist. 123524
by: Phil07/22/2015
This thing is easy to use and works well. The only problem is that the LED indicators draw much less current than my trade Lights which has made diagnosing my specific problem difficult. 213620
by: charles hill12/21/2010
tester this is a dreat product to check your ride to see if everything is working right. it checkes every funtion,you do have to have two people to check or do a lot of walking, 4409
by: rodneyb06/01/2016
Product worked as designed. It was nice to have a series of trouble lights to see when you didn't have the actual trailer that would be connecting to the receptacle handy. 255364
by: Roland M.07/10/2016
A real time saver when troubleshooting light system. Checks vehicle side so you don't waste time checking circuits and can concentrate on the finding the failed light. 270306
by: MAX02/04/2013
USING THE 7 PLUG TESTER WAS A SLAM DUNK. WISH I KNEW ABOUT IT SOONER. I KEEP IT IN THE GLOVE BOX. WHAT DO YOU HAVE FOR TESTING A TEKONSHA BRAKE CONTROL? THANKS MAX 64950
by: Todd R11/05/2013
Works good. I have a brake controller though and it wouldn't like up. I suspect its a problem with the type of controller I have. Everything else works great. 106388
by: David B06/23/2012
Great tester. Great price. Unfortunately, now I have to find the problem......Well worth the price just to relieve the aggravation of my old tester. 45366
by: Helen10/30/2015
We haven't tried the tester yet, probably this weekend. But, we have had excellent success with every product we've purchased through e-trailer. 231107
by: Bob02/04/2012
Thank You for the Fast service and Great Deal THis is a real time saver as I had a problem and the plug helped me fix it "GREAT PRODUCT" Thanks 31076
by: James D. Rogers11/17/2015
This was exactly what I was looking for and at a price less than one fourth of competitors. I will look to e-trailer for future products. 232149
by: Bud M.03/20/2017
Fast shipping after order was placed. Item works as described in the info about product. Will use etrailer again for future purchases. 355939
by: JMH11/08/2016
Product is working well, and if we need to purchase other items for the trailer, we will not hesitate to do business with etrailer.com 314868
by: John C.08/30/2015
Nice product! I was able to check the lights on my truck without any helper, I have a problem with my left turn signal. Now I know! 222849
by: CRAME10/22/2013
Item was shipped and arrived in minimum time and works as advertised, I'm very happy with quality and functionality of this tester. 104747
by: Robert04/06/2013
Just what the doctor order, work's great and easy to use. Thanks for your help and your tect's help. Best regards; Robert Brown 74507
by: SA11/01/2012
Works well. Brake light is dim when brakes are applied, but I assume that is due to the controller. No directions are included! 58613
by: machart5501/27/2017
It has help me solve some wiring issues on my truck. I have also let others borrow it with success. I highly recommend it. 335898
by: Jerry H10/16/2016
Bought a new brake controller and updated all the lights to LEDs , all parts are good quality. Would recommend etrailer 308816
by: Joey12/04/2014
Cheap easy way to test the wiring of the truck plug. Must have for any business which has a fleet of trucks. 163377
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