1. Electrical Tools
  2. Pollak
  3. Black
  4. Testers
  5. Tow Function Tester
Pollak 7-Way to RV Socket LED Circuit Tester

Pollak 7-Way to RV Socket LED Circuit Tester

Item # PK12741
lowest price pledge
Retail:$55.00
Our Price: $26.01
You Save: 53%
Electrical Tools
Orders above $50 qualify for Free Shipping
Shipping Weight: 0.23 lbs
Quantity: 
In Stock
PK12741 - Tow Function Tester Pollak Wiring
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
This circuit tester plugs into the 7-way connector on your RV. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working. Call 800-298-1624 to order Pollak electrical tools part number PK12741 or order online at etrailer.com. Free expert support on all Pollak products. Guaranteed Lowest Price and Fastest Shipping for Pollak 7-Way to RV Socket LED Circuit Tester. Electrical Tools reviews from real customers.
  • All Info
  • Reviews (89)
  • Q & A (31)
  • Videos (2)
  • Photos
  • Why etrailer?

Pollak Electrical Tools - PK12741

  • Pollak
  • Black
  • Testers
  • Tow Function Tester

This circuit tester plugs into the 7-way connector on your RV. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.


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


12-741EV Pollak 7 Way to RV Socket LED Circuit Tester





Video of Pollak 7-Way to RV Socket LED Circuit Tester

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Pollak 7 Way to RV Socket Circuit Tester Review

Today we're going to show you the Pollak 7-way RV socket LED tester. Part number PK12741. This tester is designed to work with seven pole connectors, works on your RV or in this case we have a truck with a seven pole built in from the factory. It has LED indicators for all the functions. We'll go ahead and cover the markings. LT for left turn, TM for marker lights or trailer marker lights, RT for right turn, [email protected] volt for our constant supply out for our trailer, BK for brake controller output if your truck or RV has it, and BU for our back-up light. Now we have six functions here, number seven would actually be our ground.

We'll take a look a the top here, you can see has all brass contacts just like any other seven pole connector. So this is very handy to keep with your trailer. If you happen to use your trailer on different vehicles, you can verify if the truck that's pulling it is working correctly or not. Let's go ahead and try it out on our truck. It plugs in just like any other seven pole connector. Line up this key with the groove.

On the connector just push it in firmly and you can let the lid rest, but I'm going to hold it up and you can see right off the bat it's showing us that we have a constant 12 volt supply from the truck. Next we'll go ahead and go through the functions and we'll make sure everything works. Okay, first off we'll go ahead and take a look at the left turn signal. Okay, that works. Now we'll turn on the running lights or the headlights. Okay, we have a good circuit there.

Let's turn that off and now we'll try the right turn signal. Okay, good function there. Of course we have our 12 volt power supply. Now our vehicle does not have a brake controller, but it would light up the same way as the other two. We've put the vehicle in reverse.

Okay, we see we got reverse light. And also if we had the brake light we'd have the brake pedal pushed on. WE can also see how the right turn and left turn come on at the same time. All right, and with that that'll finish it for the Pollak Seven-Way RV Socket LED circuit tester, part number PK12741.


Customer Reviews

Pollak 7-Way to RV Socket LED Circuit Tester - PK12741

Average Customer Rating:  4.8 out of 5 stars   (89 Customer Reviews)

This circuit tester plugs into the 7-way connector on your RV. LED lights indicate which functions (brake, turn, tail, stop, reverse and 12V) are properly working.

- PK12741
by:

Not much to say about a trailer plug tester other than it works just fine and is as advertised. Shipping was prompt and I was able to solve my neighbors wiring problem quickly without a hassle. If I ever need any trailer related parts or ?? You people will be the first that I will contact. Thanks


Comments
It still works great
Roy - 10/12/2020


- PK12741
by:

Great product, that makes a quick check to insure the vehicle is not the problem with the trail lights/brakes. Cuts the troubleshooting in half.



- PK12741
by:

I bought the 7-way LED circuit tester. I bought a used Class A motor home and have had problems with the 7-way plug on the motor home This will help me resolve the last issue. A few weeks ago I had also purchased the 4-way flat LED tester and now have both in my tool box. Thanks


Comments
Great to have in my tool box. I loaned it to a guy in the camp site next to us.It helped him to locate his problem in minutes. GREAT!
Gary W - 06/11/2020


- PK12741
by:

This is so easy to use. I keep it in the package for the easy to read light definition on the back. I love that the product is shaped like a handle for easy unplugging.



- PK12741
by:

Very pleased


Comments
excellent
Bruce S - 11/15/2021


- PK12741
by:

2021 Denali 2500 HD Turn indicator and emergency flasher indicators dont function Dont buy it if you have this vehicle, which is brand new, FYI



- PK12741
by:

Just what I needed.... I have 4 trucks and 6 trailers, and when a light isn't working, I have to figure out where the issue is originating.... with the 7-way circuit tester, I now know the trucks are good to go..... thanks etrailer!



- PK12741
by:

Good and useful product. Only problem is that if the Pollak keyway on your vehicle is on the bottom side you can't easily see the LED lights! This would be a more useful product if the lights were visible from both sides. Suggest a design change to do that would be appropriate.



- PK12741
by:

works well. worth the price. you have to make sure you get the correct one. those 7 pins can be wired differently. email them and tell them what vehicle you have. some trailer hitches have the groove on top some on the bottom. if yours is on the bottom you will have to lay on the ground to read it, because the lights will be pointing at the ground. the lights are on the groove side.



- PK12741
by:

Super helpful to have one of these testers. I suspected my trailer battery was not getting charged by the tow vehicle, and this tester confirmed the problem was my 12 volt wire is not active. Saved me time as now I know where to go next for resolution. Also easily can confirm my truck's trailer plug works without having to hitch up. Totally worth it in time saved.



- PK12741
by:

Arrived promptly and it worked as expected when I tested it on my tow vehicle. A previous reviewer stated that he wished there was a card that listed what each light tested. It is marked on the plug around the test lights, but the printing is the same color as the plug. That is the only reason that I gave this product 4 stars. I used a paint stick to highlight the markings so that I can read them easily without my glasses.



- PK12741
by:

They sell great products and help you get the right one. Fantastic company



- PK12741
by:

The tester plugs in easily and works fine. It's hard to remember what the lights mean. It would be helpful to include a small heavy paper or plastic card that could be carried with the tester that identifies the lights.



- PK12741
by:

This tool reduces effort in hooking up the towed vehicle/trailer to check out trailer wiring. Simple, effective.



- PK12741
by:

Worked well. After testing, my new RV is headed back to the dealer to fix a wiring problem with the trailer light jack.



- PK12741
by:

It works great. I have used it on several vehicles. Only problem is using it on GM vehicles the light display is on the bottom side when you plug it in which makes it hard to read.



- PK12741
by:

perfect fit



- PK12741
by:

Works well



- PK12741
by:

I use it after installing trailer wiring on my trucks. Works great!


Comments
It still works fine. No complaints.
Ryan - 03/13/2018



- PK12741
by:

good product. I have used it a few times. Chuck



- PK12741
by:

I love this tester. It showed me right away which circuit on my truck was out. I wish I had kept track of how many people I have helped with this tester. It is a must buy to keep in your tow vehicle.



- PK12741
by:

Worked fine, helped me solve the proble m.



- PK12741
by:

Great product!



- PK12741
by:

Just what I needed to troubleshoot my 7 way plug on my motorhome.



- PK12741
by:

Easy to use, well made circuit tester. Great choice for a tool to throw in the truck to have ready anytime you hook up a trailer.


25
89
Show More Reviews

Ask the Experts about this Pollak Electrical Tools

  • Troubleshooting 2002 F-250 Towing Horse Trailer with Working Exterior Lights but No Interior Lights
    It sounds like the interior lights on your trailer are powered through the 12 volt circuit on your Ford's 7-way. So, start by testing to make sure that pin is active. On a standard RV style 7-way, this is located at the 1 o'clock position. I've attached a diagram for visual reference. Using a tester like # PK12741 would be the easiest. You could also simply have a case of corrosion on/in the connectors that is preventing the +12V auxiliary power from reaching the trailer. If this is...
    view full answer...
    Image 1 for
  • Will the Pollak Circuit Tester Work on Newer Trucks Using LED Lights
    While the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 is designed to work with all 7-way connectors. There have been issues with vehicles such as Audi, Mercedes-Benz, and Volkswagen that have issues due to the LED lights having such a low power draw. The newer truck models are starting to have some of those same issues since they are starting to use led lights as well, so the tester will most likely not draw enough power to work. The best way to remedy that if it happens for...
    view full answer...
  • Does Flicker of Brake Output Circuit on Trailer Wiring Mean There's an Issue
    The flicker you are seeing on the brake output circuit of your vehicle is normal. Brake controllers will lightly pulse their output circuit to check to see if a trailer is connected due to the amperage draw of the brake magnets. So what this all tells me is that your issue is most likely on the trailer side of the equation. This can be as simple as corrosion on the pins of the trailer wiring connector or it could be damaged wire, bad brake magnets or the grounds of the assemblies having...
    view full answer...
  • How Could Pollak 7-Way Tester part # PK12741 Test Brake Controller Circuit
    To use the Pollak 7-Way tester part # PK12741 that you have to test the brake controller of your vehicle will require a buddy to press the brake pedal of your truck to see if the voltage from the brake controller makes it to the tester and lights up the correct LED. Also have them use the override handle of it to see if that lights it up as well.
    view full answer...
  • Is There a Tester for Trailer Side 7-Way
    There is a tester for a trailer side 7-way (the standard blade-style, which is what I think you were referring to by flat 7-pin tester), though not a tester that you can plug in between your vehicle 7-way and trailer side 7-way; you would need to get two separate testers, one for each. For the trailer side tester, the only option is the Tekonsha Trailer Wiring Circuit Tester # 8010. This is a comprehensive tester and all you have to do is plug your trailer's standard 7-way into it...
    view full answer...
  • How to Determine the Functions of the Pins on a Vehicle Side 7-Way Trailer Connector
    The Pollak circuit tester # PK12741 will tell you which functions are working in a 7-Way trailer connector but it doesn't tell you the location of the functions within the connector. But I can tell you that. If you are looking at the face of a vehicle side 7-Way where you would connect the trailer: 1 o'clock position is 12 volt power 3 o'clock is right turn and brake lights 5 o'clock is output to trailer brakes 7 o'clock is ground 9 o'clock is left turn and brake lights 11 o'clock...
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Brake Issues on 2004 Ford F-350
    It sounds like you have a wiring connection issue with your brake controller or a bad brake controller. When you plug in a trailer, your brake controller will see a power draw on your trailer brake circuit to tell the controller there is a trailer with brakes connected. From what you wrote, it seems that your brake controller immediately sends braking power to the trailer when it senses connection. I recommend first cleaning your 7-way connections on your vehicle and trailer using...
    view full answer...
    Image 1 for
  • Troubleshooting Only Running Lights Working on Trailer
    The first thing to do is take a look at your owner's manual to locate any trailer fuses or relays and ensure they are all there and in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going...
    view full answer...
  • What to Use to Test 7-Way Trailer Connector
    To test a 7-way trailer connector on the rear of your vehicle you can use the Pollak Tester # PK12741. This tester is designed to work with all 7-way connectors. Another option is to use a circuit tester like # 40376 and go come pin to pin testing each individually. If you're trying to test the trailer side connector it's a little different. A disconnected trailer doesn't have a power source so you will need something to provide it. The Hopkins Tow Doctor # HM50928 and Tekonsha Circuit...
    view full answer...
  • Troubleshooting 7-Way 12 Volt Trailer Wiring Circuit of 2007 Ford Expedition Not Active
    First thing to try is cleaning the pins on your 2007 Ford Expeditions's 7-way as a bit of corrosion on the 1:00 pin notoriously kills the 12 volt accessory circuit. I believe this is most like the issue since you said all of the fuses are good on the vehicle. You can also check for voltage on this pin with a circuit tester like # PTW2993. If the pin is just dead and you've tried with the vehicle running and the key on (sometimes this is only way this circuit is active) then easiest solution...
    view full answer...
    Image 1 for
  • Tip for Pulling Out Fuses of 2002 Ford F-350
    Sometimes fuses can be difficult to pull out as they are pretty small, fit tightly in the slot they are installed in, and typically there's just not enough room to fit your fingers between them enough to pull them out. I'd grab a set of needle nose pliers to pull out and install the fuses of your 2002 Ford F-350.
    view full answer...
  • 2004 Ford F-250 Auxiliary Charge Line Fuse for 7 Way Connector
    I'll start by saying that how your trailer lights are powered depends on how the trailer is wired; in most cases the lights on your trailer are going to be powered the auxiliary battery on your trailer and not on a separate circuit. This battery is going to be charged by the 7 way connection between your truck and trailer. I would start by verifying that your 7 way connector is providing power to all of the circuits; you can use a 7 way tester like the # PK12741 to test to make sure...
    view full answer...
    Image 1 for Image 2 for Image 3 for Image 4 for
  • Tow Package Fuse and Relay Locations for a 2005 Ford F-350
    The fuse locations and functions are listed in the owner's manual for the 2005 Ford F-350. There are a lot of documents on the Ford site for the truck so it is possible you were looking at one of the others which would not be helpful for this. The fuses related to any tow package wiring are as follows: Passenger compartment fuse panel: Location 20: 15 amp, Trailer tow Electric Brake Controller (EBC) Location 28: 10 amp, Trailer tow EBC logic Location 38: 20 amp, Trailer tow park...
    view full answer...
  • Tricky Tow Package Wiring on 2013 Audi Q7 to Think a Trailer is Connected
    Circuit tester # PK12741 will likely not draw enough power to make the tow package on your 2013 Audi Q7 think a trailer is connected. This is due to the light power draw from the LED lights. What you need is adapter # C57003 for a 7-Way to 7-Way or # TR20141 for a 7-Way to a 4/5-Way. These adapters have load resistors that will simulate additional load on the system so that the vehicle won't throw the bulb out alert when a trailer is connected. If you are just doing some testing...
    view full answer...
  • Testing 12 Volt Power on 2016 Ford F-150
    What happens on some 2015 thru 2017 Ford F-150's is that the 12 volt output to the 7-way is turned off when in park or even during gear shifting. The easiest way to test this is the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 which you just plug in and which lights up in regards to each function on your F-150's 7-way, including the 12 volt. Otherwise you would simply use Cordless Circuit Tester # PTW2979 and you can use the help article on trailer wiring I added which shows...
    view full answer...
  • P3 Brake Controller Does Not Light Up Circuit Tester PK12741
    The P3 brake controller # 90195 will only send back a little bit of power when just sitting so if you use the manual override on the controller then it should light up the tester solid. Using the brake pedal to test also will not work properly because the controller will not send back power if the vehicle is not moving. There are other ways to test a brake controller. In the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit...
    view full answer...
  • Does Pollak 7-Way to RV Socket LED Circuit Tester Work With 2016 Ram Factory Brake Controller?
    There are no compatibility isseus with use of the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 so it will work just fine on your 2016 Ram 2500. I've included links to a pair of video reviews of this tester for you to check out as well.
    view full answer...
  • Troubleshooting 7 Way Wire Functions on a Camper
    It sounds like your wires are most likely all wired up correctly. If you are wanting to verify that, I recommend the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741. A more likely culprit is probably damaged wiring somewhere along the circuit or possibly some corrosion built up around the running lights pin on the trailers 7-way. If you have a damaged wire you would want to splice in new wires individually for the ones damaged on your 7-way wiring or splice in a jacketed 7-way bundle...
    view full answer...
  • Recommended Tester for Vehicle 7-Way
    Sounds like you just need a tester for your Jeep's 7-way, and there is one option I recommend above the rest, which is from Pollak: - Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 I really like this tester because it is so simple to use; you just plug it into your 7-way and its green LEDs will light up if the functions are working properly. The functions are noted on the tester as well so there will be no confusion as to which circuits are functioning correctly and which...
    view full answer...
  • Troubleshooting Tekonsha Prodigy P2 Brake Controller on Brand New Trailer
    From what you are describing, it sounds like we're dealing with a short on the brake circuit. The "P.L." code is displayed when the P2 # 90885 senses a power interruption while the brake pedal is depressed. A solid ".c." for electric brakes or ".C." for electric over hydraulic brakes, indicates the trailer is connected, so the fact that it was flashing reassures us the connection is not solid. I would start by checking your trailer connector. Disconnect the trailer and clean any dirt...
    view full answer...
    Image 1 for
  • Connection Indicators on Hopkins # HM48503 7-Way Connector
    Yes, if you have correctly attached the wires to your Hopkins # HM48503 7-way trailer connector with test lights, then each of the LED indicators will light as the function is used. If the tester light does not light up, then the corresponding light or function on the trailer will not work either. I have attached a video that demonstrates how the wires are connected inside the unit, and shows how the lights come one with each feature. If you would prefer a stand-alone tester you...
    view full answer...
  • Troubleshooting Black Screen on Hopkins Smart Hitch Camera in 2013 Ford F-150 with OEM 7-Way
    I reached out to my contact at Hopkins and they suggested testing the center pin on your 7-way with the help from a friend who can shift the vehicle into reverse while you test. You can use a tester like the Pollak LED Tester # PK12741 which is super easy and simple to use. If no power is going to the center pin then check your fuse box as it may be missing a fuse and/or relay to activate the trailer tow backup lamp circuit. This is very common on Ford trucks like your 2013 F-150.
    view full answer...
    Image 1 for
  • Can 7-Way Circuit Tester Be Used on Upside Down Ford 7-Way
    We have 7-way testers that will work for you like the part # PK12741 but since your 7-way is upside down the display would be harder to view since you'd have to be underneath the tester. We don't have an easy solution for that unless you wanted to try and rotate the 7-way 180 degrees.
    view full answer...
    Image 1 for
  • Brakes on My 5th Wheel Are Not Working But Trailer Lights All Work Fine When Connected
    If you have electric brakes or electric over hydraulic brakes, the first thing to do in either case is take a circuit tester like # PTW2993 to test your signal from the brake controller to the trailer connector at the rear of your 2015 Ram or the bed if you have the relocation attachment like # 41157. With the alligator end of the tester clipped to a clean ground, touch the probe to the 5 o'clock position while hitting the manual override on your brake controller. You can also use a 7-way...
    view full answer...
  • Taillights and Turn Signals Working But No Brake Lights on Trailer
    Almost every trailer in the U.S. uses a 2-wire or combined wire tail light setup. This means that the turn signals and brake lights are on the same circuit and use the same bulb in the trailer tail light assembly. Because of this, virtually every trailer wiring adapter is designed to carry the turn signal and brake lights on the same pin circuit, so I would assume that this is the case for your 7 to 4 way adapter. It sounds like with working turn signals and taillights, that the problem...
    view full answer...
  • How to Determine Wire Functions on Trucks
    What happens on some later model year Ford trucks is that the 12 volt output to the 7-way is turned off when in park or even during gear shifting. The easiest way to test this is the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 which you just plug in and which lights up in regards to each function on your F-250's 7-way, including the 12 volt. Otherwise you would simply use Cordless Circuit Tester # PTW2979 to determine which of the pins is the auxiliary 12 volt. Additionally,...
    view full answer...
    Image 1 for
  • Standard 7-Way Wiring For Vehicle Side Trailer Connection
    I don't know which truck or trailer isn't wired standard, but it sounds like with multiple trailers working on your vehicle that your friend's truck and trailer are wired wrong, but to fit each other. I've attached a picture of what each of the 7 pins are set to function when set up with the standard configuration. I've also attached an article on trailer wiring to help. I suggest using a circuit tester like # PK12741 to help you determine if your truck is wired correctly and what function...
    view full answer...
    Image 1 for

Do you have a question about this Electrical Tool?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality electrical tools for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate electrical tool information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Joe V
Installed by:
Joe V
Employee Cole B
Installed by:
Cole B
Employee Andrew K
Video by:
Andrew K
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
Employee Dustin K
Video Edited:
Dustin K

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.