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Pollak 7-Way to RV Socket LED Circuit Tester

Pollak 7-Way to RV Socket LED Circuit Tester

Item # PK12741
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PK12741 - Tow Function Tester Pollak Wiring
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In Use/Installed

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. Lowest Prices for the best wiring from Pollak. Pollak 7-Way to RV Socket LED Circuit Tester part number PK12741 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (57)
  • Q & A (25)
  • Videos (2)
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  • Why etrailer?

Pollak Wiring - PK12741

  • Tools for Wiring
  • Testers
  • Pollak
  • 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 Wiring - Tools for Wiring - PK12741 Review

Today we're going to be taking a look at part number PK12741. This is the Pollack 7-Way to RV Socket LED Circuit Tester. This tester's going to tell you which functions are working in a 7-way trailer connector. All you have to do is plug in the tester. Plug it into a 7-way connector, and then the LED lights are going to indicate which functions are working properly. It's got the indicators right here.

It's got the lights, and then underneath each light and on top of the light, it's going to tell you what the functions are, and I'll go over that here at the end of the video. The unit's made from a really nice, durable, plastic construction, so it's going to be corrosion-resistant. It's going to have the easy-grip finger tabs that's going to make it really simple to connect and disconnect. When you connect the plug to your connector, each light will light up when the specific function is activated. Right here it's got the little indicators. BU is going to stand for backup or reverse circuit, that's going to be the center pole connection.

RT is going to signify the right turning brake. TM is for the tail lights or running lights. LT is for the left turning brake. BK is for the brake controller output, your electric brakes. Then 12V is going to be the 12-volt power feed.

Really easy system to use, I took it out to my truck and plugged it into my connector. It worked perfectly, letting me know which functions are wired correctly and functioning well. .


Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (57 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 716280


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

102078

- PK12741
by:

Order processed mailed delivered overnight. Great service. 330327



- PK12741
by:

Great tester. Works like a charm. Don't know why I waited so long to get one. Always relied on old fashion type of testers. This is far superior, and indicates flawlessly. No more doubting or second guessing. Shipping was painless. Received item in about 5 days. Darn good for a shipment to Canada. 573077



- PK12741
by:

I had been looking for a tester like this locally but could not find one. I ordered it and it arrived in short order, it works great and is a great addition to my tool bag! 261344


Comments
Wonderful! Perfect to keep in my door pocket, just to be sure!!
Blue M - 06/16/2017

25078

- 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. 271218



- PK12741
by:

I use it after installing trailer wiring on my trucks. Works great! 352166


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

35847

- PK12741
by:

It verified what problem I am having...Wish there was a card for the light identification or at least have the letters in a white color so you can see them better...Other than that ordering, shipping, delivery was spot on...Good Job 677761



- 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. 512313



- PK12741
by:

Very pleased 911842



- PK12741
by: 11/13/2020

Works as advertised 911500



- PK12741
by:

Works as advertised. Easy to use. 908500



- PK12741
by:

Just what I needed to troubleshoot my 7 way plug on my motorhome. 904279



- PK12741
by: 10/25/2020

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. 903781



- PK12741
by:

Works as advertised n very happy 893924



- 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. 893778



- PK12741
by:

I think it's exactly what I ordered in a timely fashion and every bit worth its price. 881156



- PK12741
by:

Makes it easy to test circuits 877199



- PK12741
by:

871462



- 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. 808543



- PK12741
by:

quick delivery. parts is well made and works great. 785616



- PK12741
by:

works great 783289



- 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. 776317



- PK12741
by:

Great for a quick check. This is now part of my "pre-flight" safety checklist. 770048



- PK12741
by:

Good tester Works well. 717967



- PK12741
by:

Has instructions on back of package showing positions of all wiring locations 715274


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57
Show More Reviews

Ask the Experts about this Pollak Wiring

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Trailer Tow Fuse Locations for 2004 Ford F-350
    I took a look at the online owner's manual for your 2004 Ford F-350 and was able to find that the trailer tow battery charge/12V power circuit fuse is located in the number 115 position and is a 20 amp fuse. There is also a trailer battery charge relay located in the number 305 position. The fuse/power distribution box is below and to the left of the steering wheel, by the brake pedal. In order to access the fuse box, you will need to remove the panel cover. Additional fuse and relay...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Right Turn Signal & Running Light No Working After Replacement
    We can resolve this issue. This seems like a 12-volt continuity to the lights, or a grounding issue at the lights themselves. Since you are having trouble with two different wires, but not all lights, I would double check your 12-volts to the right turn signal/brake light which is the green wire. I would also check the brown wire for the running lights. At the connector on the back of your vehicle check for 12 volts with your vehicle lights turned on. Then with the blinkers turned on....
    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...
  • Troubleshooting Trailer Tail Light Functions with 2010 Toyota FJ Cruiser
    I recommend using a circuit tester like # PTW2993 to check the wire function at your 7-way. You should have both the stop and turn combined for the left side at the 9 o'clock pin position and the stop and turn for the right side combined at the 3 o'clock position. When you have the brake on, the turn signal should still function. You can use a 7-way tester like # PK12741 to test that function as well. I've attached a video to assist. If you have the both functions for each at that...
    view full answer...

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Info for this part was:

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

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