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7 Way Trailer Connector Vehicle Tester

7 Way Trailer Connector Vehicle Tester

Item # TR20117
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In Use/Installed

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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Tow Ready Wiring - TR20117

  • 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.


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   (168 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:

Worked as advertised. 567659



- 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:

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:

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:

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 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:

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:

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:

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:

Always wanted one of these. Much better than using an ohm meter. Quick and easy. 738985



- TR20117
by:

Great for troubleshooting 714564



- TR20117
by:

Product works great. 703504



- TR20117
by:

Excellent Pricing and customer service. Couldn't get this product from our normal dealer. etrailer had it in stock, shipped it quickly, and provided excellent customer service to boot. Thank you. 699256



- TR20117
by:

It's great so far and Bill was awesome. 689997



- TR20117
by:

On time, works as advertised. 673601



- 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


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Ask the Experts about this Tow Ready Wiring

  • 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...
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  • 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...
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  • 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.
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  • 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...
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  • 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....
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  • Using Trailer Wiring Tester to Sync and Setup Prodigy RF Brake Controller
    When pairing the Prodigy RF Wireless Brake Controller # 90250 we have heard of this issue a few times and it doesn't have to do with the vehicle at all. I reached out to my tech contact at the manufacturer and he said that they are rewriting the instructions because it is confusing and the double zero won't appear until it is paired, which doesn't happen when it is new or even sometimes when it is transferred to another vehicle. So, here is a step by step to get you going based on the...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • How to Activate Trailer 12 Volt Circuit of 7-Way on 2017 Ford F-150
    The 12 volt power circuit of the 2017 Ford F-150 7-way has to have the key on to activate and due to the "smart" tow setup you have to connect to a trailer and do a setup on the info setup that includes naming the trailer. Should be page 110 in the owners manual. Let me know if that fixes the issue. I've heard of other people doing all of this and still not having it active. In this case easiest solution is run a 10 gauge wire like part # 10-1-1 through a breaker part # 9510 from the...
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  • 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...
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  • How to Activate Trailer Tow Charge Circuit in 2017 Ford F-250
    All 2017 F-Super Duty vehicles equipped with a factory trailer brake controller (TBC) utilize a trailer module (TRM) which initiates the trailer charging system. For trailer charging to operate, the TRM must detect a trailer is connected and a brake pedal input before charging will be present at the trailer connector. Adding the trailer battery charge relay and fuse into the battery junction box are NOT required to operate trailer charging with a TRM. This is covered in Ford document...
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  • Troubleshooting No Power to 12V Pin on 2015 Ford F-250 7-Way Connector
    It sounds like you aren't getting any power at the 12V pin on your 2015 Ford F-250's 7-Way connector. I took a look at the online version of the owner's manual for your truck and found that you will want to check the 40 amp cartridge fuse located in the number 10 position inside the power distribution box under the hood. Check to make sure this fuse is present and in good condition. If this is the fuse you already checked or you find that it is also in good condition, then I next recommend...
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  • 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...
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  • 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.
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  • 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...
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  • Solution for 12 Volt Power Accessory Circuit on 2017 Ford F-250
    The 12 volt power circuit of the 7-ways on the newer Ford trucks like your 2017 Ford F-250 is an odd situation. Many people have the same issue as you or they have found that the gauge wire used for this circuit is just too small to power anything. Best option is to bypass it all with 10 gauge wire like part # 10-1-1 and a circuit breaker like part # 9510 to run from the pin on the 7-way all the way to the positive pin of the truck battery. This will give you a circuit active whenever needed...
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  • Which Fuse on Truck Carries Circuit to Charge Trailer Battery
    Look for the circuit labeled that is most likely labeled "trailer 12 volt accessory" as that's the circuit that would be charging your trailer battery. Since I don't know what vehicle you have it's harder for me to get more specific than that. Another solution is to bypass the factory wiring and run a 10 gauge wire like part # 10-1-1 through a breaker like part # 9510 from the positive post of the battery to the 1:00 pin of the 7-way and you'll have the circuit activated.
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  • Solution for No Power to the 12v blade on 7-way Connector on 1999 Ford F250 Super Duty Truck
    Easiest method will be to bypass the factory wiring and go with 10 gauge wire like part # 10-1-1 with the breaker # 9510 to the vehicle's positive terminal. Since this bypasses everything it would not interfere with vehicle wiring at all.
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  • Can a Breakaway Battery and Deep Cycle Battery be Charged off of the Same 12 Volt Line
    What you could do is use the center pin on a 7-Way and instead of having the reverse light circuit on that pin you could remove the wire that is there and run a 10 gauge wire, such as # 10-1-1 sold by the foot, from it up to the truck battery via a 40 amp circuit breaker # PK54540. Then run wire from the center pin on the trailer side to the deep cycle battery to maintain it. This way the batteries each have their own 12 volt source and there is no chance of back feeding. Another option...
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  • 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...
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  • 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.
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  • Will Tow Ready 7 Way Trailer Connector Vehicle Tester Work With RV Freightliner Chassis 7-Way
    The Tow Ready 7 Way Trailer Connector Vehicle Tester part # TR20117 is pinned to test the vehicle side 7-way with a standard pin out. The BK function code should illuminate when you press the brakes not the LT and RT functions. It sounds like the brake controller may not be compatible with the tester. It is designed for Tekonsha, Draw-Tite and Ford OEM brake controllers. The 7-way you are testing may be pinned differently as well. I recommend to use an individual circuit tester part # 40376...
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  • 7-Way Trailer Connector 12 Volt Circuit has Power All the Time
    The 12 volt circuit on a 7-Way that was hardwired into a vehicle is going to have power all the time. Provided nothing is plugged into the 7-Way that draws power from the 12 volt circuit then it would not be a problem. The little LED light would take months to drain a vehicle battery if you were to let it sit all that time and never start the vehicle. But there is a way that you can shut off power to the 12 volt circuit when the vehicle is off. You would need battery isolation solenoid...
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  • 2011 Ram Trailer Wiring and Fuse Location
    On your 2011 Ram , the brake controller pin is at the 5 o'clock position. I've attached a photo to assist with all the function locations. You can use s 7-way tester like # TR20117 to check functions. There is a fuse for your running lights and from what I could find in the online version of the owners manual, the trailer tow lamps/park lamps fuse is in cavity J14 and requires a blue 20 amp cartridge fuse.
    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...
  • 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...
  • Can Hopkins 7-Way RV Style Trailer Connector and Tester # HM48503 be Used as Just a Tester
    Technically, yes, but Hopkins 7-Way RV Style Trailer Connector and Tester # HM48503 is meant to work as a trailer connector and tester. If you only need a tester to check a vehicle side connector then # TR20117 would be the way to go. Since # HM48503 is open at the back I do not recommend using it as just a tester since moisture and other crud could get inside and cause it not to work properly.
    view full answer...

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Info for this part was:

Installed by:
Joe V
Expert Research:
Mike L
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Robert G
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Michael H
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Jeff D
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Jameson C
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Adam R
Video by:
Andrew K
Video Edited:
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Updated by:
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