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LCD Digital Circuit Tester

LCD Digital Circuit Tester

Item # PTW2992
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Performance Tool Wiring - PTW2992
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Lowest Prices for the best wiring from Performance Tool. LCD Digital Circuit Tester part number PTW2992 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Performance Tool Wiring - PTW2992

  • Tools for Wiring
  • Testers
  • Circuit Tester
  • Performance Tool


  • Economy LCD Circuit Tester with LED back light
  • Ideally used to detect power, voltage, ground, and circuit integrity
  • Surge protected circuitry displays DC voltage from 3V to 48V (±0.3V accuracy)
  • Conduct circuit tests with increased accuracy and ease
  • LED indicates RED for power or GREEN for ground

W2992 Performance Tool LCD Digital Circuit Tester

W2992 LCD Digital Circuit Tester

Installation Details PTW2992 Installation instructions

California residents: click here

Video of LCD Digital Circuit Tester

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

Video Transcript for Performance Tool Wiring - Tools for Wiring - PTW2992 Review

Today we're going to be taking a look at the Performance Tool LCD Digital Circuit Tester. This circuit tester features an LED back light. It's going to be ideally used to detect power, voltage, ground, and circuit integrity. Serge protected circuitry is going to display DC voltage from 3 volts to 48 volts, with a plus or minus 0.3 volt accuracy. This is going to allow you to conduct circuit tests with increased accuracy and ease. It's got the LED light in there that's going to indicate red for power, or green for ground.

The shank length measuring just that probe right there, that's going to be about 3-3/8 of an inch long. The spring clip which is this portion right here, it's got a nice, protected boot over it. That's going to be a copper construction for great contact. Then it's going to have a coiled cord with a cord saver on there. When fully stretched out, that's going to measure around 12 feet long. When you're ready to use it to test for circuit ground, just connect the spring clip to a good power supply.

I'm actually going to do that, just to show you how the unit works and how it looks. We want to get that connected to a good power supply, and then we'll test our ground wire. You can see that that LED is going to display green, and it's going to display the voltage, so all you got to do is touch the pointed probe to the circuit terminal's wires or chassey to locate the ground. Then the green LED will illuminate, and the LCD will display the measured voltage. Really nice design of the unit.

That does display as a negative number for good ground. Then when you're ready to test for circuit power, just connect the spring clip to a good ground connection. We'll do that, as well, just to show you. Then you can touch the probe to a circuit terminal or wire. Then the LED is going to illuminate red, and the LCD will display the measured voltage if the terminal has power. That's going to do it for today's look at the performance tool LCD Digital Circuit Tester..

Customer Reviews

LCD Digital Circuit Tester - PTW2992

Average Customer Rating:  4.6 out of 5 stars   (10 Customer Reviews)

- PTW2992

Great product work well 558314

- PTW2992

This is an awesome product at a great price. Elsewhere online it was $100 so it was a large savings You can check ground just like a regular trouble light but it light up green and you know how strong your ground is.Then you can check power supply then it lights red for power and lets you know the volts. I have tested my remote battery to find out it was weak it was below 3 new one tested 3.1 .I work in the auto field so it will be used to check batteries, charging systems, light sockets,window switches, ect. I love this tester I wont have to break out my ohm meter near as much.The tester appears to be very well built time will tell.For around $20 everyone should own one. 475553

- PTW2992

great item, fast delivery, just what I ordered. Thank You 714041

- PTW2992

Used it twice it fried would not recommend. I bought the tester for general trailer repair for testing lighting circuits and all around diagnostics the one time that it did work it was nice to see the voltages but I just went back to my regular test light. Nothing like having a tool in your box that is garbage and not dependable. Buyer beware. 620503

- PTW2992

These guys make that online big box store look like a minor league player. The shipping was fast, the product is great and works well. I will be ordering two more this week as everyone who borrowed mine loved the product. I already sold one to co-workers diagnosing electrical problems. The 48 volt capability makes this one tool capable of diagnosing weak batteries in parrallel and series wiring, measuring solar panel output, and diagnosing voltage draw a breeze. 540147

- PTW2992

Works great 480663

- PTW2992

I received the item way earlier then expected and it works exactly as said and exactly as I need it to. Very high quality great for quick electronic diagnosis. 475514

- PTW2992

good product at affordable price, 441322

- PTW2992

Great product and excellent service 427065

- PTW2992

Excellent product. Just what is needed for all the new electronics systems. Computer safe, test circuits without fear of damaging equipment. The addition of the digital voltage readout is a big plus when testing and trouble shooting. Bought two, will order a third for the boat emergency tool kit. Invaluable tool for those pesky electrical gremlins. 367777


Ask the Experts about this Performance Tool Wiring

  • How to Determine Wire Functions on Trailer to Install Furrion Vision S Side Cameras
    You can determine which black wire on your trailer is ground by hooking your trailer up to your tow vehicle and turning your running lights on. This will cause one of the wires to have power. You can determine which is which using a circuit tester like part # PTW2992 or a multimeter like part # PTW1714. Once you know which wire carries which function you can attach the wiring of the Furrion Vision S Side Cameras # FCE48TASL. The black is ground, the brown is running lights, and the red...
    view full answer...
  • Brake Controller Not Getting Power on a 2010 Ford E350 Van
    The first place that I recommend checking when you lose power to something would be your fuse box. A blown fuse can cause the power to not reach your brake controller. If your fuses look okay then it might be easier to find a wire that is connected to your battery and trace it back to your brake controller. If you can find the right wire this way, then you can check for any signs of corrosion, exposed, or damaged wiring. As for the connector in the picture that you sent, there are no...
    view full answer...
  • All Trailer Lights and Brakes Work With 2014 Ford F-150 But Not With 2007 Dodge Ram 1500
    What I recommend doing is using a Circuit Tester # PTW2992 and check the different pin locations on your 2007 Dodge Ram 1500. You will want to check the pin in the 5 O'clock position while a buddy activates the manual override lever on your brake controller to test the brakes, and the pin in the 11 O'clock position for the tail/running lights. I also recommend testing the rest of the pins to make sure that they are in good working order as well. I have attached a picture to demonstrate...
    view full answer...
  • Tekonsha Prodigy RF Turns Off and On When Turn Signal is Used
    I spoke with my contact at Tekonsha and the problem that you are experiencing is most likely caused by faulty wiring on your trailer. The (discontinued) Tekonsha Prodigy RF 90250 works by activating the brakes when there is a signal on both the Left Turn/Brake and Right Turn/Brake wiring functions. If your turn signal is causing the RF to act up then you will want to do some tests to see where the wiring problem is. Check to make sure that the ground on both your tow vehicle and...
    view full answer...
  • Troubleshooting No Left Turn/Stop Trailer Signal Coming from Fuse Box on a 2015 Chevy Silverado 2500
    If you checked the wiring for your left turn trailer stop signal and you are getting no signal directly out of the fuse box then you will want to replace the fuse on your 2015 Chevrolet Silverado 2500. This will be the mini fuse in the 14 position in your engine compartment fuse block per your owner's manual.
    view full answer...
  • EOH Brakes on New Trailer not Working With 2016 GMC 3500 With OEM Brake Controller
    Since you have already tested the trailer brakes with a few different trucks by different manufacturers (2 of which have been used with an Electric Over Hydraulic (EOH) system), the problem should be with your trailer. The reason that they most likely recommended checking your trucks is that we have seen issues with OEM brake controllers from manufacturers working with EOH systems. What you will first want to check is the connectors on both your 2016 GMC Sierra 3500 and your trailer....
    view full answer...
  • Troubleshooting Brake Lights on a Horse Trailer
    Typically on a horse trailer with a 6-Way, the different colored wires should have the following functions: Yellow - Left Turn & Stop Green - Right Turn & Stop Blue - Brake Controller Output Brown - Tail & Running Lights White - Ground Black - 12V Power Sometimes the Blue and Black functions are swapped, but for your application it looks like you will just need to switch out the Brown wire with the Black wire to the 4-Way on your horse trailer. This will give you full functioning...
    view full answer...
  • How to Determine Which Fuse on Vehicle to Check for Trailer Wiring
    It all depends on what circuit isn't operating anymore for your trailer. For basic 4-Way wiring you have the running/tail lights, the left turn/stop, and then the right turn/stop. If you have a 7-Way then it could be any of those or you also have the possibility of the reverse light function, brake controller output, or 12V power. I am attaching some photos showing where the various pins and their functions would be located as well as some troubleshooting articles on wiring. If you...
    view full answer...
  • Stoplight Signal Location for a 2015 Chevy Traverse
    Yes, the White Wire in the # 11 position on your BCM (Body Control Module) for your 2015 Chevrolet Traverse should be the cold side of the stop light switch. You can verify this by using a Circuit Tester # PTW2992. This wire will only get hot when the brake pedal is pressed which shows that it is the cold side of the stop light switch.
    view full answer...
  • What is the Typical Wiring for a Tow Vehicle Side 7-Way
    If you check out the picture I attached of a typical 7-Way you can see that the 12V Power is typically on the 2 o'clock position pin and the Brake Controller Output is typically on the 4 (or 5) o'clock position pin. You can verify this with a Circuit Tester # PTW2992 while applying full power with the manual override lever on your brake controller. If your trailer 7-Way is not wired in this manner then I encourage you to swap the wiring on your trailer before the wiring on your 2007...
    view full answer...
  • Installation of Wiring Harness Keeps Blowing Fuses
    Typically when a fuse keeps blowing that means there is a short somewhere on your wiring circuits. You can isolate the issues to your tow vehicle or trailer by simply disconnecting the trailer before replacing your fuses. Once you know which end the problem is on you want to start off by making sure that your grounds are all secure and connected to clean, bare metal surfaces. Next you will want to simply look along the wiring for any places where the wires look bent, damaged, corroded,...
    view full answer...
  • Trailer Brake Lights Stay on After Brake Pedal is Released in Tow Vehicle
    It sounds like you have a short somewhere on your towing setup. I recommend isolating the issue by testing the pin on your tow vehicle side connector with a circuit tester like part # PTW2992. If it is not sending power when you take your foot off the brake pedal then the problem is on your trailer. If it is sending power when your foot is off of the brake pedal then the problem is on your tow vehicle side. Either way you will want to start off by checking the connectors from the tow...
    view full answer...
  • Troubleshooting Trailer 7-Way Wiring With Constant Power on Lighting Circuit
    When power appears on a vehicle's trailer wiring when it should not the reason is usually a short or corrosion. The short-circuit or corrosion can let power from one circuit bleed over to another. Sometimes you can see the problem at the trailer connector but other times you may not find it until you disconnect things. I understand that you have checked the fuse box and found that there is not a fuse in the position for the trailer 12V power circuit. Please note that the 2006 Suburban...
    view full answer...
  • Troubleshooting Right Turn Signal on 5th Wheel Trailer Malfunctioning
    It sounds like you have a short on the circuit for the right turn signal on your 5th wheel trailer. If the 7-Way on your tow vehicle and your 5th wheel look good then you will want to start off by using a Circuit Tester # PTW2992 to test the pin in the 3 o'clock position on your tow vehicle side 7-Way (see attached picture). If you are getting a signal when you use your right turn signal then the problem is on your trailer. Either way, you want to start off by checking the grounds...
    view full answer...
  • Troubleshooting Right Brake Light on Trailer Not Working But Right Turn Signal is Working
    Thank you for all of the details in your question. It looks like you have a faulty ground or some corrosion in one of your connectors. On a trailer the functions for your turn signals are also tied into the brake lights so if your right turn signal is working on your trailer but the brake light isn't then there are a few things you can do. I recommend starting off by checking both the connector on your 1998 GMC Savana and the connector on your trailer. Check to make sure that they are...
    view full answer...
  • Troubleshooting Trailer Lights Work But Not the Trailer Brakes
    There are a couple of things that we can check to troubleshoot your brake controller not working. There is a fuse for the electric trailer brakes according to an online version of the owner's manual for your 2008 Ford F-150. It is a 30A fuse located in the "F105" location. If that fuse looks good then there are a few other things we can look at. Since it is a brand new controller the problem is most likely the wiring on either your F-150 or your trailer. To determine which end the...
    view full answer...
  • Troubleshooting Right Brake and Turn Not Working on Trailer Towed by 2015 Jeep Grand Cherokee
    To determine if your fuse is the culprit start off by taking a circuit tester like part # PTW2992 and testing both sides of the fuse to make sure that it is getting power on both sides. If it is then the problem is elsewhere on your towing setup. If there isn't power getting to both sides then you will need to take your 2015 Jeep Grand Cherokee in to a shop and have them look at it. If there is power going through the fuse then the next step is to check the connector with the same tester...
    view full answer...
  • Weak Voltage At Brake Output Circuit On 7-Way Plug
    First you want to test the brake output circuit on the 7-Way Plug with a circuit tester like part # PTW2992 with the manual override or brakes applied in the vehicle. If you are not testing the brake output circuit with either one of these activated you will not see the full voltage on the 7-Way which is what you want. If you are testing with manual override on the brake controller activated or the brakes depressed and are still getting weak voltage on the brake output circuit then there...
    view full answer...
  • Tail/Running Lights Not Working on Trailer
    You will want to start out by looking at the connector on both the trailer and your tow vehicle. Make sure there is no corrosion or debris especially on the tail/running light pins. The Tail/Running Lights will be in the 1 o'clock position on your trailer (11 o'clock on the tow vehicle side). Next to check would be the grounds. Make sure they have metal to metal contact and there isn't any rust or corrosion; the surface must be clean. If that looks good then you will want to test...
    view full answer...
  • Troubleshooting Working Lights on 2003 Sundowner Horse Trailer Not Working
    It sounds like you aren't getting 12V power for the lights on your trailer. The best place to start is the 7-Way connector on your 2016 Chevy Silverado 2500. Check the pin in the 1 o'clock position on your 7-Way with a tester like the part # PTW2992. If you have constant power on this circuit then the problem is on your trailer but if you don't have constant power that either means you need to turn the vehicle on (sometimes the 12V turns off when the ignition is in the off position) or...
    view full answer...
  • All Lights on Boat Trailer are Flashing When Turn Signal is Used After Ground and Wires are Checked
    If you have checked the grounds on your camper and boat trailer and they are all secure and connected to clean-bare metal surfaces, and if you have checked all the wiring on your camper and haven't found any places where the wiring is corroded, bent, exposed, or damaged, then you will want to check your connectors. The connector on your camper is most likely the issue since your boat trailer works just fine when connected directly to your Tahoe. You will want to look for any green or white...
    view full answer...
  • Does Trailer Need to be Plugged in to See Voltage on 2017 Ford F-350 Smart Wiring Harness
    From our experience the newer Ford pickups have a "smart" harness that only outputs power at the trailer connector when a trailer is coupled to the pickup. This means that if you are using a tester like part # PTW2992 which shows you the voltage, you won't see anything near 12V unless your trailer is plugged in. Typically you need to have the vehicle on as well for it to recognize that the trailer is connected.
    view full answer...
  • How to Figure Out the Correct Wiring Functions for a 1992 Fleetwood Caribou Truck Camper
    What you will need to do is use a Circuit Tester # PTW2992 to see what wires perform which functions on your truck and then use a 12V power source like your truck's battery to test the wiring on the camper. You can then wire the correct functions together. Even though there can be some common themes with wiring (Black for 12V Power, White for Ground), there really is no "rule" as to what colors need to be used for which functions. Using the testing method that I just mentioned will...
    view full answer...
  • Troubleshooting Horse Trailer Interior Lights Not Working with 1999 Ford F-250
    Most likely the interior lights on your horse trailer are connected to the 12V circuit of the trailer and truck's 7-Way, although you may want to verify this. If this is the case then there are a couple things you can check but I recommend starting at the truck. You can use a circuit tester like # PTW2992 to make sure you're getting power at the 12V pin on the 7-Way connector at the bumper (1 o'clock position). If you aren't getting power then you likely have a blown fuse somewhere...
    view full answer...
  • Right Tail Light Not Working on Trailer With New Light and 7-Way Connector
    If the right tail light on your trailer is working properly when you connect it to an alternate source of power at the 7-Way, and you have verified that the ground is secure and has a clean, metal-to-metal contact, then the problem is most likely on your truck. Check to see if there is any rust, corrosion, or debris in the connection itself. Clean the connector if there was any and use some Dielectric Grease # 11755 for a strong connection and to help prevent corrosion and moisture affecting...
    view full answer...
  • Running Lights Not Working on Trailer With New Wiring
    Start off by making sure you connected the tail/running lights to the appropriate pin on your trailer's 4-Way or 7-Way depending on what kind of connector you have. For a 4-Way the pin should be the brown colored wire. This will also be the pin that is closest to the female ground connection part. For a 7-Way it will be the pin that is in the 1 o'clock position. Also check the connectors both on your tow vehicle and trailer to make sure there is no corrosion or debris. Once you have...
    view full answer...
  • Testing the 7-Way Functions on a 2001 Chevrolet Suburban and Trailer
    It sounds to me like it is a wiring issue. What I recommend doing is using a Circuit Tester like part # PTW2992 and test both the functions on your Suburban and your trailer. On your Suburban these are what the functions should be when you are looking at the 7-Way from the outside: 1 o'clock - 12V Power 3 o'clock - Right Turn & Stop 5 o'clock - Brake Controller Output 7 o'clock - Ground 9 o'clock - Left Turn & Stop 11 o'clock - Tail & Running Lights Center - Reverse Lights Your...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Installed by:
Cole B
Written by:
Mary E
Updated by:
Erin H

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