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Wiring > Tools for Wiring > Testers > Circuit Tester > Tow Ready


7 Way Trailer Connector Vehicle Tester

Tow Ready Wiring

ratingratingratingratingrating (45 reviews)


Code:   TR20117

Retail:$16.74

Price:$13.99


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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.

Replaces 18179



20117 Tow Ready 7 Way Trailer Connector Vehicle Tester







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 review of tow ready seven way tester 20117
Tow Ready 7 Way Trailer Connector Tester Review

Video Transcript for Tow Ready 7 Way Trailer Connector Tester Review

This is great for anyone who has a seven pole on their pickup which hasnt been used in a while and want to test it before they head down the road with a trailer. Also if you do hook up your trailer and it does not work for whatever reason, you can use this to tell if the truck is working or if its your trailer thats not working. Its a really handy tool to keep in your toolbox. Well go ahead and install it and show you how it works. Basically you install this on your seven pole as you would a trailer. Now well go through the functions and show you how it works. First well try the running lights, then the brake lights then well do the individual turn signals. This should be left turn and then right turn. Now we will try reverse. This product tests for the following functions: left and right turn, running lights, brake lights, reverse lights, and your twelve volt hot lead which is not installed on this vehicle. There you have it for part # TR20117.




Customer Reviews

7 Way Trailer Connector Vehicle Tester - TR20117

Average Customer Rating:  ratingratingratingratingrating4.6 out of 5 stars   (45 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

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating by: 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating 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






- TR20117

ratingratingratingratingrating by: AD01/03/2013


The item is just what I needed. And shipping was fast too !!! Thanks etrailer.com 62417






- TR20117

ratingratingratingratingrating by: Mike M05/12/2011


Works nicely, just as described. Great tool to keep in the toolbox. 13731






- TR20117

ratingratingratingratingrating by: Ross B.04/21/2011


easy to use, the lights make it easy to identify problem areas 12161






- TR20117

ratingratingratingratingrating by: Dan T09/13/2012


WOW....can you say fast service(within 2 days) Thank you 54642






- TR20117

ratingratingratingratingrating by: Dave S.06/03/2012


Works as advertised. Etrailer service and prices excellent 42523






- TR20117

ratingratingratingratingrating by: Archie L.09/28/2011


This product works well I would recomend this to a freind. 24814






- TR20117

ratingratingratingratingrating by: tom s07/04/2014


Great product and fast response from et railer. 139161






- TR20117

ratingratingratingratingrating by: tom s07/04/2014


Great product and fast response from et railer. 139160






- TR20117

ratingratingratingratingrating by: Jim W.08/12/2014


I am very pleased wioth my purvhase. Thanks again. 146154






- TR20117

ratingratingratingratingrating by: Rob O.03/09/2012


Great little device, saves time & guess ing. 33449






- TR20117

ratingratingratingratingrating by: edcam04/15/2014


very nice product to carry in your truck 125200






- TR20117

ratingratingratingratingrating by: Dave W.05/18/2012


Great product, Excellant price THANKS 40963






- TR20117

ratingratingratingratingrating by: RGA09/10/2013


Saves a lot of time and labor... 99268






- TR20117

ratingratingratingratingrating by: DuMond04/01/2013


Works well great trouble shooter 73664






- TR20117

ratingratingratingratingrating by: John K.09/25/2013


Just What the Doctor Ordered!! 101550






- TR20117

ratingratingratingratingrating by: Yup05/11/2011


Just what I was looking for. 13615






- TR20117

ratingratingratingratingrating by: Pete08/04/2012


works as advertised. 50512






- TR20117

ratingratingratingratingrating by: cindy B10/29/2012


Works perfect! 58278






- TR20117

ratingratingratingratingrating by: Jim P.02/10/2011


Works perfect! 6927






- TR20117

ratingratingratingratingrating by: John G.10/24/2013


Great tester 105004






- TR20117

ratingratingratingratingrating by: mike a.02/04/2012


awesome 31053




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Ask the Experts about this Tow Ready Wiring
Expert Answers about 7 Way Trailer Connector Vehicle Tester - TR20117Do you have a question about this Wiring?


  • 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...

  • No Power To The 12 Volt Terminal On The 7-Way Vehicle End Connector
  • The 12 volt power lead on the 7-Way will be the terminal that supplies power for trailer interior lights, trailer battery charging. If you are looking at the 7-Way on your vehicle the 12 volt power terminal is the #4 (black) pin located at the 1:00 position. It is normally either a black or red wire. See the picture to the right of a typical 7-Way and it will show the terminal locations and what each function is. I am including a video link on how to wire a 7-Way vehicle end connector. If...
    view full answer...

  • Flashing Trailer Lights with a 2008 Mercedes GL450 with Factory Tow Package
  • It sounds as if you have the trailer ruled out as the problem. I would recommend you check the ground connection on the trailer, to make sure it is connected securely to clean metal, so you eliminate that as a potential problem. I would then look at the connector on the vehicle. Try using a tester, part # TR20117 to check if all circuits are functioning. If you find a problem at the connector, since the tow package is factory, not aftermarket, I would recommend you check with your Mercedes...
    view full answer...

  • Will Tow Ready 7 Way Connector Vehicle Tester # TR20117 Test If a Brake Controller is Working
  • The Tow Ready 7 Way Trailer Connector Vehicle Tester, part # TR20117, will test the 7-Way connector on your 2008 Ford Super Duty to make sure all the functions are working and the terminals are wired properly. It will tell you if you have 12 volt power and brake lights at the 7-Way which is needed for a brake controller. It does not test to tell if your brake controller is working or not. You will need to test your brake controller separately. I am including a link to a video that will...
    view full answer...

  • Pairing Tekonsha RF # 90250 to 2011 Mercedes Benz GL450
  • The Prodigy RF is an excellent piece of equipment, but in order to synchronize the power unit to the hand held remote, the pairing instructions mentioned in the owners manual need to be followed to the letter. First, use a circuit tester like part # 40376 on the 12-volt power supply pin on your 7-way to ensure it is powered up. The pin will be in the 1:00 position in the connector. If this pin is not active, the controller will not pair to the remote. Begin by hitching the trailer...
    view full answer...

  • Using Tow Ready Trailer Connector Tester Part # TR20117 to Diagnose OEM Brake Controller Problem
  • The Tow Ready 7-Way Connector Tester will draw enough power to simulate a trailer. Another option would be to try a different trailer on your truck. If the same problems appear, you will have eliminated the trailer as being the problem. I would also recommend you check the trailer connector on the vehicle and the trailer, making sure neither is damaged or corroded. If you can see any white or green corrosion on the pins or sockets of the connectors, there is a chance that the corrosion...
    view full answer...

  • Trailer Lights Stay on Once Vehicle Ignition is Shut Off
  • I suspect your problem is caused by a damaged or corroded trailer connector. Take a look at your trailer connectors, both the socket on your truck as well as the plug on the trailer. Look for green or white corrosion on the pins or sockets of the connectors. If corrosion is visible, there is a strong possibility that the corrosion has spread to the interior of the connector. The terminals that each individual circuit connects to are very close together, if corrosion builds up on the...
    view full answer...

  • 2006 Ford F350 With OEM Brake Controller Not Reading Trailer
  • When using the wiring diagrams you speak of, it is important to remember that wire colors can vary, and it is best to wire by function rather than wire color. The easiest way to determine which wiring circuit preforms which function is to use a car battery, ground the white wire from the trailer connector lead to the negative battery terminal, and apply 12 volts to each of the remaining circuits in order to determine their function. By going this route, you can be sure that the connector...
    view full answer...

  • Tips on Finding the Fuse for 12 Volt Circuit on a 2007 Winnebago Trailer Connector
  • The hard way to find a fuse is to trace a wire. This is nearly impossible if the wire disappears into the vehicle where you can't follow it. The manual may not call it something that is obvious. Trailer tow, auxiliary power, or any number of phrases could be used. It could also be located in the cab or under the hood. If the manual is no help most power distribution box lids and panel lids have a legend on them that might be more helpful. If you just cannot find it at all you can bypass...
    view full answer...

  • Trouble Shooting a Primus Brake Controller on a 2003 Chevrolet 2500 HD
  • Often times if break-away kits are not wired properly, they will cause problems with a brake controller. The first thing to do would be to make sure there is not a problem on the vehicle. Disconnect the trailer and turn on the truck. You should see one dot on the display, in the center, indicating that the brake control has power and is active, but there is no trailer connected. When you apply the manual lever with no trailer connected the display should read n.c.. If all this works...
    view full answer...

  • Trouble Shooting Inoperable Electric Brakes on a 10K Trailer
  • Since you have fresh parts in the hubs and provided they are installed properly, I suspect there is a problem somewhere in the wiring or with the brake controller installation and set up. You will need to check the whole system, step by step, to find out where the problem is. If you have used your truck successfully with other trailer brake equipped trailers, then the brake controller and vehicle wiring should be fine and you can skip the first 2 steps. If you tried it on different vehicles...
    view full answer...

  • Troubleshooting Trailer Brakes Locking Up When Lights are On and no 12 Volt Circuit Voltage
  • It sounds like somehow the running light circuit got wired to the brake output circuit of the 7-way at the rear of your vehicle, and that is why when the lights are on the brakes lock up. I would check the wiring of the brake output circuit of your 7-way, I would be willing to bet there are two wires run to it and one of them is the running light circuit that should be run to the correct terminal of your 7-way. Check out the FAQ article I attached on trailer wiring.
    view full answer...

  • Troubleshooting Fuses Blowing after Replacing Trailer 4-way with 7-Way
  • Sounds like there is a short on the vehicle side of the trailer wiring. Check the wiring of the connector on your tow vehicle to see if there is any cut or exposed wire and fix as necessary. The short will be on the 7-way side of the wiring of your tow vehicle. What circuit has the 10 amp fuse that is blowing? That will be a good indicator what circuit has the short. I attached a couple trailer wiring FAQ articles for you to check out as well.
    view full answer...

  • Troubleshooting 12 Volt Power Circuit not Functioning on 7-Way After Re-Wire
  • There could be corrosion or dirt inside your 7-way that needs to be cleaned out before all of the circuits of the 7-way will activate. That's the most common reason circuits on a 7-way won't function properly. You can test this easily by using a circuit tester like our part # 3808 to test the wires that feed into the 7-way on the circuits that aren't functioning. If the wires have voltage but not the pins the problem is corrosion or dirt on the inside or outside of the connector. Also,...
    view full answer...

  • Lost Reverse Light Signal on a F-350 Dump Body Truck and Trailer
  • Is reverse light function dead at the 7-Way connector on the F-350 or you just not getting reverse lights on the trailer anymore? Check with the 7-Way connector on the truck with either a circuit tester like part # 3808 or a 7-Way tester like part # TR20117. If you have the reverse function at the truck connector then the problem is on the trailer. If not, then the problem is probably on the truck. If the problem is on the truck, trace wiring and check for nicks or fraying connections....
    view full answer...

  • No 12 Volt Power on 7-Way on a 2012 GMC Sierra Denali
  • Most likely you need to make some connections under the hood of your truck to make the 7-Way fully functional. Under the hood, driver side, near the windshield you will find the power distribution box, There should be wires attached to the 2 studs on the forward most studs. If there are not you will need to locate them and attach them. The battery charge wire should be located under the master cylinder/brake booster assembly. Attach it to the smaller stud on the front of the power distribution...
    view full answer...

  • Troubleshooting Left Turn Signal Staying Hot on a 2013 GMC 3500HD Towing a Trailer
  • If you used a 7-way circuit tester like our 7 Way Trailer Connector Vehicle Tester # TR20117 and the LT circuit stayed lit that would indicate that there is voltage on this circuit at all times which means something is shorting out onto this circuit. Due to the fact that it is hot all the time it would seem that it is the 12 volt power circuit that is shorting to the left turn/brake circuit. I suspect you have a 7-way round connector since on these style connector the left turn and 12...
    view full answer...


Info for this part was:


Expert Research:
Michael L

Expert Research:
Robert G

Expert Research:
Michael H

Expert Research:
Jeff D

Expert Research:
Jameson C

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