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7 Way Trailer Connector Vehicle Tester

7 Way Trailer Connector Vehicle Tester

Item # TR20117

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Tow Ready Circuit Tester Wiring - TR20117
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  • Tools for Wiring
  • Testers
  • Tow Function Tester
  • Tow Ready
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. Lowest Prices for the best wiring from Tow Ready. 7 Way Trailer Connector Vehicle Tester part number TR20117 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


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  • Reviews (162)
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Tow Ready Wiring - TR20117

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:

  • 7-way circuit tester
  • 12V power
  • Function Codes:
    • BU: back up or reverse circuit center pole
    • RT: right turn/brake
    • TM: taillights
    • LT: left turn/brake
    • BK: Brake controller output
    • 12V: 12-volt power feed


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.



20117 Tow Ready 7 Way Trailer Connector Vehicle Tester

Replaces 18179



TR20117 Installation InstructionsInstallation Details TR20117 Installation instructions



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.




Video Transcript for Tow Ready 7 Way Trailer Connector Vehicle Tester Review

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.


Customer Reviews

7 Way Trailer Connector Vehicle Tester - TR20117

Average Customer Rating:  4.7 out of 5 stars   (162 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.

- TR20117
by:

The product plugs in and lights up but the only fault I found is it will not check battery and brake function as should because of the Ford computer. The plug does not pull enough amps for the computer to pick up a trailer connection made. So all that lights up is the other lights such as tail, turn and marker lights. In the description it said it would work with the Ford factory (in dash) controller 596417


Comments

Ford trucks of recent manufacture feature what Ford refers to as a smart trailer connector. The connector wont output 12-volt accessory or brake power to the trailer connector unless the electrical load from a trailer is detected.

-- Mike L - 01/10/2019

48406

- TR20117
by:

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



- TR20117
by:

This tester is easy to use, just plug it in. I was quickly able to rule the truck in as the source of my brake issues on the trailer. 561633



- TR20117
by:

works well was satisfied with Item and on time delivery. 202044


Comments

Works Great, use it often

Billy C - 06/16/2016

18639

- TR20117
by:

Worked as advertised. 567659



- TR20117
by:

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



- TR20117
by:

Great function and fit. I'll keep this in the glove box in case there are any issues. 224842


Comments

Everything is working fine, although we dont get out to use it as much as wed like :

John E - 09/14/2016

20988

- TR20117
by:

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



- TR20117
by:

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



- TR20117
by:

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



- TR20117
by:

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



- TR20117
by:

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



- TR20117
by:

Product works as expected; makes vehicle electrical system testing very easy -- simple, yet effective. Will recommend this product to my company's installers and customers. 654123



- TR20117
by:

Very helpful plug to diagnose towing wiring from truck to trailer Nice price 649880



- TR20117
by:

This is a must if you are pulling trailers using multiple trucks for towing. it will save you hours of work figueing out problems. 649749



- TR20117
by:

This item saves a lot of time and guess work, best money spent with Etrailer 649519



- TR20117
by:

Saves time trying to figure out where problem is. 649476



- TR20117
by:

The parts (trailer brakes and supplies for initial brake install) were delivered ahead of schedule, they were all in good shape, and they have all worked great. 642733



- TR20117
by:

great help 638331



- TR20117
by:

I'm glad i bought this tester, as it made the installation of my brake controller and wiring adapter much easier. 636052



- TR20117
by:

This tester still works great and makes sure I’m ready to go down the road with my trailer. It’s durable and about as handy a tool as you could ask for. I would also recommend etrailer.com for all your towing needs. Their customer service and follow up are second to none! 609210



- TR20117
by:

Easiest thing for trailer wiring ever! 604903



- TR20117
by:

must have to figure out all the wiring on car and trailer. thank you. it is great. 598420



- TR20117
by:

great product, saved me a lot of head s cratching 592646



- TR20117
by:

I wish that I had this product many times over the years of pulling trailers with different vehicles. It makes it so easy to verify that all light connections are properly wired and working correctly. I have several vehicles and I can check each one in a couple of minutes and verify proper wiring. The test lights are bright and can be seen even in sunlight. I would recommend this product to anyone that pulls a trailer. 589922



- TR20117
by:

Works like a charm. Just plug and play. Etrailer is great too. First time anyone contacted me a year after purchase just to find out if I was happy with their products. 589098



- TR20117
by:

Worked as it should be! 586539



- TR20117
by:

Product arrived today. Product works as described. 584010



- TR20117
by:

Takes the guess work out of if/where there is a problem. Like having an inexpensive electrician in your toolbox. 582377



- TR20117
by:

Helped comfirm a successful installation of the wiring harness. 568901



- TR20117
by:

Works great no more guessing if your hooked up or if you have a blown fuse. 566485



- TR20117
by:

Excellent product. Quick shipping and easy installation. 542694



- TR20117
by:

Service great and product works as expe cted 527137



- TR20117
by:

This is a great product to see if the lights are working properly on your trailer. It would have been nice if there were instructions on light indications when lights are properly working. 525387



- TR20117
by:

Test lights work great, now I will be able to troubleshoot other peoples trucks faster when they say their lights are not working. Thank you 522784



- TR20117
by:

At this time I can give only a partial review of the product because I can not op check it until my brake controller is installed but I'm sure it will function as advertised. As it stands, this is a good looking, nicely designed and crafted piece of equipment and fits snugly into the cars receptacle. 515345



- TR20117
by:

Good product , great service as always! 513509


Comments

Did a great job of sorting wires.

Eric K - 06/03/2019

56089

- TR20117
by:

A very handy tool to have in any tow vehicle. Before connecting to any trailer you can check to make sure you have power . Especially, brakes and lights. Thank you. 512969



- TR20117
by:

Good product works great 510362


Comments

Its still works great,no problems with it at all

Donald - 05/19/2019

55436

- TR20117
by:

Great for trouble shooting wiring conne ction. 508931



- TR20117
by:

Works as advertised. I'm very pleased with this product. 503948



- TR20117
by:

Easy install, and functions fantastic 502516



- TR20117
by:

Very good product 497269



- TR20117
by:

It works well as designed. You know right away if your vehicle is sending out the correct signals before you have to hook up the trailer. 492489



- TR20117
by:

This has held up to heavy use and is still working. 489573



- TR20117
by:

Exactly the device I wanted at a more than reasonable price. Quick delivery. 488797



- TR20117
by:

Just what I needed to check some trailer and brake circuits. 483740



- TR20117
by:

Product came in correct and on time just as requested. 482007



- TR20117
by:

great way to check all the trailer circuits to troubleshoot why certain lights aren't working. This enables the popular method of troubleshooting used by us electronics guys... "divide and conquer". Lets one know if the problem is in vehicle or trailer. 479222



- TR20117
by:

Came in on time and works great 479022


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Ask the Experts about this Tow Ready Wiring
Do you have a question about this Wiring?


  • Is There a Harness for Brake Controller on 2016 Jeep Renegade?
  • All brake controllers on your 2016 Jeep Renegade, including one such as the Hayes # HA81792BB, will need to be hardwired in as there is no compatible harness. Due to the difficulty in locating the stoplight wire it is recommended to get your brake controller professionally installed. The brake controller I strongly recommend is the Prodigy P3 # 90195; it is the most popular model we carry due to its effectiveness and ease of use. It will activate your trailer's brakes immediately in...
    view full answer...

  • Is Prodigy RF Compatible With 2018 Audi Q7?
  • Brake controllers are not vehicle-specific so the Prodigy RF # 90250 will work in your 2018 Audi Q7. If you have the factory tow package it is recommended you use 7 Way Trailer Connector Vehicle Tester # TR20117 to pair the receiver and transmitter. If you do not have the factory tow package you will need to add a 4-way connector # 119250KIT along with Universal Installation Kit for Trailer Brake Controller # ETBC7, which will give you the necessary components, including a 7-way, to...
    view full answer...

  • How to Use the Tekonsha Prodigy Brake Controller Part # 90250 on a 2018 Volkswagen Atlas SEL
  • Yes, the Tekonsha Prodigy RF Wireless Trailer Brake Controller part # 90250 will work on your 2018 Volkswagen Atlas SEL as long as you have a 7-way trailer connector. If you do not already have a 7-way trailer connector then you are going to first need a 4-way trailer connector and then a 4 to 7-way trailer connector. For this, I recommend using the T-One Vehicle Wiring Harness part # 118754 with the Universal Installation Kit for Trailer Brake Controller part # ETBC7. Please note that...
    view full answer...

  • Will 7-Way Trailer Connector Tester Work With 2011 Chevrolet 2500 HD Factory Brake Controller
  • The TowReady 7 Way Trailer Connector Vehicle Tester you referenced, # TR20117, is not compatible with all factory brake controllers. I don't believe it is compatible with your 2011 Chevrolet 2500 HD. A similar design that is compatible is the Pollak 7-Way to RV Socket LED Circuit Tester, # PK12741. This will work with your vehicle's factory controller and will be bright enough for outside use. You may need to shield direct sunlight from interfering with your reading.
    view full answer...

  • Troubleshooting Constant Power on Drivers Side Tail Light of Trailer Connector
  • It sounds like you have a crossed wire after the fuse panel. Sometimes this happens inside the trailer connector, so I recommend removing your trailer connector and using a circuit tester like # PTW2993 to test each of the wire functions at the US Car Connection locations like you see on this harness # 20147. If this connection works correctly then you will want to replace the 7-way connector on your vehicle because it has an internal issue. If this is the case, I recommend the Hopkins...
    view full answer...

  • Constant Voltage on 12V and Brake Controller Output Wire with Curt TriFlex Trailer Brake Controller
  • When testing the wire functions after installing the Curt TriFlex Trailer Brake Controller # C51140 and Wiring Harness # C51515 in your 2014 Toyota Sienna, it is normal for both the 12V and brake lights on a tester like # TR20117 to light up without actually activating the brakes. This is because the brake controller sends out a small trace current to look for a completed circuit. I have attached a demonstration video on a similar 7 Way Trailer Connector Vehicle Tester # TR20117 that shows...
    view full answer...

  • Troubleshooting Lack of 12V Power at 7-Way Trailer Connector on 2019 Ford F-150
  • Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at the 7-way. It can sense when a trailer is connected based on the voltage draw so it won't sent a signal for 12V when using some testers, especially LED testers because there isn't enough of a power draw. The system requires a power draw on the 7-way...
    view full answer...

  • Methods to Clean Contacts in 7-Way Trailer Socket on 2010 Dodge Ram 2500 Pickup
  • Inside your Ram's factory 7-way trailer socket are multiple lighting circuits and a 12V power circuit that is there to power an electric trailer tongue jack or to deliver a trickle charge to a battery mounted on the trailer. If you refer to the linked photo you can see which function/circuit is assigned to each of the electrical contacts inside the connector. The 12V power circuit is carried on the pin at the 1:00 position as you look at the socket. If your wire brush were to contact...
    view full answer...

  • Brake Controller Recommendation for 2008 Ford F-350
  • The brake output circuit is not going to be active unless you have a brake controller installed. Since you didn't mention a brake controller but tested fuses and relays I would assume you don't have one. You need a brake controller to apply voltage to the brakes as the amount of voltage that the brakes receive dictates how hard they grab. So under lighter braking applications you'd want light trailer braking and heavier situations vice versa. That's why you can't just have 12 volts ran...
    view full answer...

  • Activating 12 Volt Power Circuit of 7-Way at Rear of 2016 Chevy 2500HD
  • There's a connection you still need to make under the hood of your 2016 Chevy Silverado 2500 to complete the 12 volt power circuit of the 7-way at the rear of your truck. If you check out the picture I attached you'll see what connection I am referring to.
    view full answer...

  • Where is 12 Volt Trailer Wiring Circuit on 2019 Ford F-450
  • I pulled up the owners manual of your 2019 Ford F-450 and the fuse slot 27 is the one that carries the 12 volt trailer wiring circuit. Relay slot 37 is the relay related to this circuit too. One option you have would be to bypass the factory wiring and run your own 12 volt circuit straight to the battery. You would need 10 gauge wire like part # 10-1-1 sold by the foot and a breaker like part # 9510. You would just run the wire from the 12 volt pin of the 7-way at the rear of the vehicle...
    view full answer...

  • Comparison of the Tekonsha 7-Way Trailer Emulator # 6562 and the Tow Ready 7 Way Tester TR20117
  • Yes, both the Tekonsha 7-Way Trailer Emulator, item # 6562, and the Tow Ready 7 Way Tester, item # TR20117, will test the function of the left turn and stop, right turn and stop, tail/marker lights, 12 volt power, electric brake, and the backup circuit in the 7-Way vehicle side connector. With both testers, the electric brake test will tell you that the circuit is supplying power for the trailer brakes at the plug, but will not check for actual, or correct, voltage. A multi-meter, item...
    view full answer...

  • Should Vehicle Brake Lights Come On when Using Manual Override on Agility Trailer Brake Controller
  • Yes, the brake lights on your 2009 Kia Sorento should illuminate when the manual override on the Hopkins Agility Trailer Brake Controller part # HM47295 is engaged. It sounds like you have everything installed correctly so I would not be worried at all. If you would like to check the functions of the 7-way and brake controller you have installed without a trailer you can use the 7 Way Trailer Connector Vehicle Tester part # TR20117.
    view full answer...

  • How to Wire 7-Way To Get 12V Power Even with Vehicle Ignition Turned Off
  • It sounds like you are wanting to have 12V power at the 7-Way connector on your Ford truck even when the truck's ignition is off. With factory/OEM wiring, the availability of 12V power with the ignition off will actually vary between truck manufacturers. Generally speaking, GMC trucks tend to always have an active/hot 12V pin at the connector even when the truck is off. The 12V circuit on Ford trucks on the other hand usually require the ignition to be on for the wire to have power....
    view full answer...

  • Difficulty Pairing Tekonsha Prodigy RF # 90250 Brake Controller with 2012 BMW X5
  • The manufacturer of the Prodigy RF, Tekonsha, tells us that many European SUVs (including your X5) will throw a wrench into the works during the pairing process. These vehicles have a system that senses if a bulb on the vehicle or the trailer is burned out. This sensor works by sending a test pulse of voltage through the trailer connector every so often. During the pairing process, this can confuse the RF unit into thinking that the brake pedal is being pressed at the wrong time, which...
    view full answer...

  • Troubleshooting Voltage on Brake Controller Output
  • If you are not getting voltage at the 12 volt pin on your 2012 Ford F-350 there is likely just a short somewhere along the wiring you need to find; also check out the related fuse for your 12V, which is fuse location 90 in your fuse box. For the brake controller wiring, it sounds like it could be a ground issue if your controller was hardwired in so you are going to want to be absolutely certain your ground is attached to the negative battery terminal on your truck and you'll also want...
    view full answer...

  • Troubleshooting 7-Way Circuit Tester BK Circuit That Shown Intermittent Connection
  • BK on a 7-way tester like the part # TR20117 represents the brake output circuit for a brake controller. If you see that light flicker that is the controller testing the circuit looking for the draw of trailer brake magnets to determine if a trailer is present. In almost every situation it's a dirty pin on this circuit that causes the connection not to be there. I'd try cleaning the pin in the 5:00 position and the matching pin on the trailer's connector to see if that fixes it. Also check...
    view full answer...

  • Troubleshooting 12V Power Circuit on 2011 Ford F-350 7-Way
  • The first thing to check on your 2011 F-350 that does not have 12V power on the 7-way is the 30-amp trailer tow battery charge fuse in position 21 in the power distribution box under the hood. If you wish you can refer to page 335 of the manual. If you still do not have power at the 1:00 pin on the 7-way (see photo please) after replacing the fuse you can trace the wire for this circuit starting at the 7-way and running forward. If you have a circuit tester like # PTW2992 you can probe...
    view full answer...


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Info for this part was:

Installed by:
Joe V
Expert Research:
Michael L
Video by:
Andrew K
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Video Edited:
Jacob T
Expert Research:
Adam R
Updated by:
Laura H
Photos by:
Amber A
Photos by:
Sam P

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