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Cordless Circuit Tester

Cordless Circuit Tester

Item # PTW2979
Retail:$40.51
Our Price: $20.26
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Electrical Tools
Shipping Weight: 0.21 lbs
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  • Reviews (13)
  • Q & A (0)
  • Videos (1)
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Performance Tool Electrical Tools - PTW2979

  • Testers
  • Circuit Tester
  • Performance Tool


  • Performance Tool cordless circuit tester detects voltage from 3v to 28v
  • Ground wire or clip is not required
  • Safe with ECMs, sensors, transducers, and the like
  • 2 Type "N" long-life batteries included
  • Buzzes and lights up if power is detected when the tester is grounded
  • Overall length: 6"

W2979 Cordless Circuit Tester




California residents: click here


Video of Cordless Circuit Tester

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




Video Transcript for Performance Tool Cordless Circuit Tester Review

Today we'll be taking a look at the Performance Tools Cordless Circuit Tester, part number PTW2979. Now this is going to be your Performance Tool Circuit Tester. It's going to be a handy little thing that's only about 6 inches long. It detects voltage from 3 volts all the way up to 28 volts. The nice thing about this is it's going to be cordless. It's going to use you as the ground so you're not going to need a wire or a clip with it.

It's going to be safe to use on ECMs, sensors, and transducers as well. It comes with 2 end type long term, long life batteries. Now here we'll go ahead and test it out. It does come with your probe as well, so if you like to just press that on to your wires and then probe your wires you can. If you have a four-pole like we do here, you can just remove that cover, hold it on the chrome or shiny part here. Then you're just going to touch the ground.

This is going to use you as a ground, so if we don't touch the ground, we're not going to get anything out of it. If we touch the ground with our finger with our freehand, you'll hear the audible beep as well as see the light flash. Now, if we let off that ground . So you'll know right away if you have a bad ground. That will do it for our review of the Performance Tools Cordless Circuit Tester, part number PTW2979..

Customer Satisfaction Score:


Customer Reviews

Cordless Circuit Tester - PTW2979

Average Customer Rating:  4.5 out of 5 stars   (13 Customer Reviews)


by:

Not sure. Tried testing a 12v wire, had to go back to tried and true tester with pigtail & clamp, which gave me the result I was looking for. Maybe not doing something right, or I'm not enough negative polarity to give it a ground source. Inexpensive enough, I'll try again

Etrailer Expert

Katrina B.

7/25/2022

The best suggestions that I can give you is to test it out on some different wiring. Once I know whether or not its working on some different wiring, then I can better assist you.



by:

I lost a $75 Snap-On circuit tester and bought this one to replace it. Not only is this tester easier to use but the cost is less than a third of the Snap-On version.



by:

Everything was as advertised, and thank you Kaylyn R for your wonderful customer service. It took awhile to get everything installed, because of crazy events in the past year, but it all works great!



by:

Still using it on occasion. Have to watch the batteries.



by:

I wasn't sure how this would work but I was pleasantly surprised. Handy tool to have.



by:

OK



by:

Seems to work well, and my order was processed extremely fast. Great service!



by:

Delivery was as said and product as described.

Thanks



by:

Great products and great people to deal with.



by:

Works good as stated! Delivery was longer than expected.



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13

See what our Experts say about this Performance Tool Electrical Tools

  • Troubleshooting Lights Not Working on Right Side of Trailer
    I'm not sure which specific lights on the trailer's right side aren't working, but based on how trailers are wired I'm going to assume that it's just the brake/turn signals. If the running lights aren't working either please just let me know. With this type of issue the first thing I recommend doing is taking a circuit tester like # PTW2979 and testing the right side turn/brake light circuit pin on the truck's connector (3 o'clock position on a 7-Way or the furthest right side pin on...
    view full answer...
  • How to Determine Functions of 7-Way on Trailer
    There is no such thing as a universal color code on trailers to re-attach your wiring harness, but I can tell you how to figure it out; you'll need to start by using Cordless Circuit Tester # PTW2979. You will need to use an independent 12 volt battery and use 10 Gauge Primary Wire # 10-1-1 for a jumper wire to test the functions of the lights. You will then touch one end of the jumper wire to the positive post of the battery and touch the other end of the wire to the different wires on...
    view full answer...
  • Troubleshooting All Lighting Not Working on Truck Camper
    Hi there! None of the lights are working so there are a great many issues that could be occurring so I'll give you a number of troubleshooting methods, which will mean you will have to look at the harness on the truck, as well as the camper. to determine the specific problem you will need to use a circuit tester such as # PTW2979 to test the connector on your truck after disconnecting it from your camper. Check the wiring going into your harness from your tail lights to see if those wires...
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  • How to Connect 4-Way on Kia to 5-Way on Venture Boat Trailer
    The extra pin/circuit on the 5-Way connector for your Venture boat trailer is likely to activate the reverse lockout solenoid on the actuator (so you can backup the trailer without the brakes engaging). The 4-Way on your Kia can technically still connect to the 5-Way on the trailer to power its basic signal lights, but you would lose this reverse function. To maintain the reverse lockout function on the trailer the best solution is with the 4-Way to 5-Way Adapter # 20036. This will simply...
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  • Trailer Brakes Have Stopped Working
    There's a number of possible issues to take a look at with trailer brakes not working. You will need to find out if the issue is on the brake controller, tow vehicle, or trailer. To test the brake controller, sever the blue wire a couple inches from the back of your controller. Then use circuit tester # PTW2979 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override; if it shows power at idle then there is an issue with...
    view full answer...
  • How to Find Cold Side of Stop Light Switch for Brake Controller Installation
    I can tell you exactly how to find the cold side of the stop light switch that will attach the red wire of your brake controller, though as of this writing (May 2019) we have not yet had a chance to wire a controller to a 2019 Jeep Wrangler. What you need to to is locate the wires connected to to the brake switch at the top of your brake pedal. Then use Circuit Tester # PTW2979 and find the wire that is active only when you press on the brake pedal; that will be the wire you will splice...
    view full answer...
  • How to Install Wiring Harness 118496 in 1995 Toyota T100
    The installation of a 4-flat connector such as the T-One Vehicle Wiring Harness # 118496 in your 1995 Toyota T100 is a very simple and straightforward process; it only requires plugging in the T-connectors at the taillight wiring harness. I was unable to locate what harness you ordered from us so I'm not certain what exact harness you used but the process should not be any different (see linked installation video which shows how this harness installs). If you only cut off the connector...
    view full answer...
  • Troubleshooting Trailer Lights Not Working
    There are a few troubleshooting steps I can give you if your running lights are not working, and you already did the smart thing by first checking your fuses. 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 into your...
    view full answer...
  • Troubleshooting Brake Controller
    There are a number of troubleshooting steps you will need to take to see what the issue is with your Prodigy P3 # 90195 brake controller. You will need to find out if the issue is on the brake controller, truck, or trailer. To test the brake controller, sever the blue wire a couple inches from the back of your controller. Then circuit tester # PTW2979 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override; if it shows...
    view full answer...
  • Towed Vehicle Tail Lights Aren't Working with RV Connected Using 6-Way Connector
    In order to help troubleshoot your wiring issues, first check the connector on your RV with a circuit tester such as # PTW2979 to make sure the running lights circuit works there. If so, then check the ground wire connection on the new 6-way connector you installed. Clean the area near your ground connection to make sure you have sufficient ground and double-check the wiring on the 6-way connector you just installed. The wires should be connected as follows (see the attached diagram as...
    view full answer...
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  • E1 Error Code on Hopkins Reliance Brake Controller
    The E1 error code on the 47284 brake controller - which is the Hopkins Reliance - indicates a trailer not connected. So getting this error when you are hooked up means there is an issue either with your trailer connectors or possibly a short on the blue brake wire. Many times that can be attributed to one of your connectors having corrosion or possibly some type of debris interfering with the signal so start by taking a look at your connectors and clean the corrosion if necessary. This...
    view full answer...
  • Does Non-Working Turn Signal of Oval Trailer Tail Light Mean New Bulb is Needed
    If your turn signal is not working but the other lights are, it could mean a replacement bulb is needed, though to verify you will want to test the light with Circuit Tester # PTW2979. If the signals are getting through you will need a new bulb, otherwise it could be the wiring or a replacement light is needed. If you do need a replacement oval tail light you will want to get one that has the same or similar measurements, and that mounts the same. For example the 7-9/16" long x 3-5/16"...
    view full answer...
  • Troubleshooting Right Blinker on Vehicle Causing Left Blinker on Trailer to Function
    There are a few possible reasons as to why the right turn signal on your tow vehicle is causing the left tail light on your trailer to blink but most likely there's a simple crossing of wires on the trailer or a short on the vehicle. What I first recommend doing is taking a circuit tester like # PTW2979 to test the pins on your vehicle side connector. Test the pin for the right turn/brake signal on the connector while you have that function activated on the vehicle. If you don't get power...
    view full answer...
  • What is Going on With Trailer Lights Not Working
    The main issue here seems to be not all of the trailer lights being able to function at the same time when you utilize some functions. This is often a ground issue but since you said you have a ground to a clean, bare metal surface we can probably rule that out. Additionally an overload can be a problem but since you mentioned you have LED running lights, that is likely not an issue either. So that means there are a number of other troubleshooting steps you need to take. The first thing...
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  • LED Corner Lights Won't Come on with Load Resistor Installed
    Load resistors are used on LED vehicle lights to prevent hyperflashing on turn signals. Make sure you only have the load resistor installed on the turn signal wires as they are the only lights that will be flashing. I attached a useful diagram to reference while making sure your load resistor is installed correctly. Additionally, you could have a loose or weak ground connection. Clean the area near your ground connection to remove any corrosion and replace any corroded ground screws....
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  • Troubleshooting Brake Controller Installation Only Works With Manual Override
    Thank you for your purchase from etrailer of the Prodigy P2 Brake Controller # 90885. It sounds like the controller is not working when you press the brake pedal but is when you use the manual override which means you have an issue with the stop light switch. Use circuit tester # PTW2979 and verify you have the stoplight wire connected properly - this wire will only show power when you have the brake pedal depressed and not show power at any other time. I have added a link to a help...
    view full answer...
  • What Circuit Does Red Wire of Brake Controller Attach To
    I would hammer a little harder on what circuit they attached the red wire to of the brake controller. It was supposed to attach to a circuit that only has voltage when the brakes are applied. If they attached it to a random circuit and didn't verify it had voltage that would definitely be why.
    view full answer...
  • Troubleshooting Trailer Lights When Connected to 2005 Jeep Grand Cherokee Limited
    The best way to troubleshoot trailer lights not wiring is to test each half of your towing rig separately. So for your 2005 Jeep Grand Cherokee you'll want to use a circuit tester like part # PTW2979 to ensure that each of the pins are sending power back to the various functions. Since it sounds like you already tested this your next step is to test the wiring on your trailer. You can test the trailer wiring by either plugging it up to another vehicle or by taking a 12V battery, grounding...
    view full answer...
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  • No Braking From Trailer Brakes
    You will need to find out if the issue is on the brake controller, vehicle, or trailer. To test the brake controller, sever the blue wire a couple inches from the back of your controller. Then use circuit tester # PTW2979 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override; if it shows power at idle then there is an issue with the controller and it will need to be replaced. This may occur even if the controller shows...
    view full answer...
  • 2002 PT Cruiser Turn Signals Light Up When Being Flat Towed
    Thank you for your purchase of the 7 pin wiring harness from etrailer, and there are a couple issues that may be occurring, but not knowing the harness you have on your PT Cruiser does make it more difficult. You say you are sure the wiring is correct, so I assume you have verified the proper signals are getting through, but I do have to mention that if not, I recommend starting there, and testing them with a circuit tester like # PTW2979. Another issue is that your 2002 PT Cruiser has...
    view full answer...
  • Interior Lights Not Working on a 1998 Sooner Horse Trailer
    If all of the other functions on your trailer are working correctly, then you most likely have a short or a bad ground on the wiring that your interior lights are connected to. You can trace it all the way to the trailer connector on your horse trailer and look for any places where the wire might be bent, damaged, corroded, or exposed and replace it or fix it. Another way to test and see if that is the problem is to test the pin on your tow vehicle side connector that is used for 12V...
    view full answer...
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  • Troubleshooting Right Side Trailer Lights Not Working
    If just the right side trailer lights aren't working then the first thing I recommend doing is using a circuit tester like # PTW2979 on the tow vehicle side connector. Test the right side turn/brake circuit pin with that function activated on the vehicle to see if you get power. This will let you quickly determine which side the issue is on (vehicle or trailer) so you don't have to waste time troubleshooting an area that's good to go. If you do get power then you know the problem is on...
    view full answer...
  • Running Lights on Trailer Not Working After Installing New Lights With 2015 Toyota Tacoma
    Okay, so there's a few things you can do to troubleshoot why your running lights are not working after installing your new lights, and while a ground is likely the issue, let's just go ahead and be thorough here. While the dealer may have said the wiring on the truck wasn't the issue, you didn't mention fuses, so start with that; 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 so, you'll need a circuit tester...
    view full answer...
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  • Trailer Lights Do Not Work With 2012 Nissan Frontier
    Since some of the lights on your trailer are not working with your 2012 Nissan Frontier, 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 is my recommendation due to how easy it is to use - and test the connector on your...
    view full answer...


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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Erin H
Updated by:
Erin H
Employee Jared G
Installed by:
Jared G
Employee Jacob W
Written by:
Jacob W

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