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LCD Digital Circuit Tester

LCD Digital Circuit Tester

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Performance Tool Electrical Tools

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Features:

  • 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

Item # PTW2992

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 LCD Digital Circuit Tester Review

Hi, they're hard workers! Today we're going to be taking a look at Performance Tool's LCD circuit tester. To give you an idea of how your circuit tester works, it has LEDs in here that'll light up when both power and ground is present. You'll have to clip your probe onto either power or ground. The, the clip end here, we've got that attached to the ground side of our battery. And then with the probe end, instead of the clip side, you'll touch this to your other circuit. And if there is the opposite there it'll light up.

So currently you've got ground on the clip side and our probe, or touching on the positive of our battery post and it lights up red. It also gives us a voltage reading on there, raking in about 12 and a half volts. Now we could swap this and hook it up the other direction. So we're hooking our clip onto positive, and then we're going to take our probe and touch it to ground, and it also lights up. But you will notice now that it's lit up green, letting you know that your probe side is touching on ground and you have power present on your clip side.

You'll also get a voltage reading there. And that's really nice that you get a voltage reading there, because if you have any drop across your circuit, you can help detect that as well. So you can kind of check out the integrity of your circuit while doing this. It's kind of a special thing here. Most of your test lights will just have a light on it.

It's really nice. And you've got that volt meter on there as well to get additional information. For example, currently now we're reading about 12 and a half volts, but if I was checking this further on down the circuit, and if we had some corrosion in that circuit, I may only read 12.1 volts further on down that circuit. And I know, Hey, the voltage has dropped from what it is here at the battery by a few tenths of a volt down there. Maybe I should look for a little bit of corrosion or a bad connection at that point.

And it may even drop even lower. You may only have like 10 or 11 volts and if you're checking it like that, then there's a good chance that you're finding, Hey, this is probably why I'm finding where my issue is. My item wasn't working. I was checking my circuits along the way, and I see a drop in voltage that's excessive, check your circuits there. So we're gonna go ahead and go through some examples of common uses of this and some, little bit more in depth tests that you can perform with a test light. Often people will use these to test the circuits at the back of their vehicle, and they usually do this when they plug up to your trailer and you find like, Hey, I don't have taillights or I'm missing a turn signal or something like that. Well, rather than immediately digging in and trying to fix some wires, let's figure out, Hey, where's the issue at is the issue on my vehicle side or is the issue with my trailer. That's where I like to start. So I've gone ahead and turned on the hazard lights in the vehicle, as well as the tail lights. And that should activate all of our signals. So we're going to take the clip here. We're gonna hook this on ground, which is the exposed stud there, so just flipping that on there, kind of putting the rubber boot off to the side here a little bit to help keep me from touching it. And now we're just gonna check our circuits. So here, we've got 12 volts here at the back. So we know that our taillight circuits working, and we've got a flashing signal there giving us our 12 volts so we know that that's working. And if we look at here, the color of the wire coming in, that's yellow, so that's gonna be our left turn signal. And then our right turn signal is the green wire. When we checked this one as well, we'd get our light lighting up and giving us our 12 volts. So we know that our vehicle side here is working properly. And this will also work when testing your six and seven way connectors as well. You just need to pay attention to what the circuits are. So for the four-pole ones, we we're able to turn on tail lights and hazards to get all these operational. With a seven way, you'll need a brake controller plugged in and somebody operating the output of it in order to be able to test that circuit, your auxiliary circuit should normally just have power on it all the time, but sometimes you have to start the vehicle to get the auxiliary circuit to come on. So just pay attention to those. So that way you know that you're getting the output back to your connector when you're checking, just verify that your vehicle has that particular output. In this instance, if we had an issue with our trailer though, we know that our vehicle's okay, so we can go ahead and button up this side. We don't need to diagnose anything over here. We would then turn to our trailer and try to figure out, okay, why, why is that signal not working So then we would do that from there. So here, we've got a scenario for you where we're going to show you a short to ground and how to diagnose it. Currently, I've got a scenario set up, so our board here, this is the load for our device. It's going off right now. And this just normally comes on when you put your vehicle in reverse. So let's say in our scenario, we put our vehicle in reverse, but instead of this, coming on, nothing happened because this was what a short to ground would be like, if there was a bare spot on your wire, it would spark a little bit. And what would eventually happen, it was over, it would overload the circuit and then it would pop your fuse. And if we take a look here, we can see that the fuse has blown. It's now open. So this was a temporary thing that we just put in there in place. But if you've got a short to ground in your trailer, it's likely always gonna be grounded out like that. So let's just go ahead and set that scenario up. So now we're in the current faulted state where we had started where the board was working, was the proper fixed state. We simulated a short to ground. So we're just gonna put this short to ground back so I'm stuffing that there. I'm just stuffing this in here just for simulation purposes. So now what's going to happen next is you go, oh, I got a blown fuse. Okay. Well, my fuse is blown. I'll just put another fuse in. And when you go to put another fuse in, you got to pull it back into reverse or operate, whatever accessory you're planning on operating, and it just pops the fuse again. Oh no. Well now, you know, you've got a real problem you gotta solve. Your test light can be a real wonder in these scenarios cause we can take that fuse out of there, Instead of wasting a bunch of fuses, what we can do is we can complete the circuit with our test light. And normally when you're doing this, you're probably gonna have to take a, a paper clip or something like that to clip into the other ends. And you can poke it down in there. So I'm gonna grab one of those real quick so we can mock that up. So now what we've done is we've taken our test light and we put it in place where the fuse used to be. The probe is in one prong, and then we used a paper clip and clipped it onto the clip side of the other side of the test light and put that in the other prong. And what you'll see there is that our test light has lit up. So what you'll want to check now is where, we know that this light's only gonna light up. if we've got a complete circuit that has a path all the way from power, all the way to ground, and then it'll light that light. So at this point you can put it in the particular state in which you're trying to activate, whatever it be, a light or whatever you're putting it in reverse to activate a light, go ahead and do that. We can see that's lit up. And now you would just start disconnecting circuits until you figured out an isolated where the short was. One of the things I like to do first, if it's easy to get to, is to take away the ground at the very end of the circuit, because our test light doesn't take very much current to amp, to light up. So if you think it's like a bulb or something, it can actually go through the bulb, so let's make sure that particularly at the ground at the very end of the circuit, So this is the load at the end. This is normally like a brake light bulb or something. You have your power that goes to the bulb or whatever your load is, and then the other side just goes right to ground. Well, if we remove this ground here at the end, what should happen is your test lights should turn out if there's no shorts, but if you look here, our test light's still lit up. That means that there's a path to ground still somewhere present. So you would work your way down the line to the next easiest connection point that you get to, and you would disconnect it there. If the test light turns off, then you know, okay, my short is between the point that I just disconnected there, and then a point further towards the back of the vehicle, back closer to the battery. If you just keep disconnecting circuits and the lights still light up, it is still lit up, then you know that you need to keep working your way towards the battery to find that issue. After I disconnect the one at the very back, what I usually do next is I'll disconnect the one here at the very front, and that way, I've eliminated between those two connectors and I can start finding that point. So we know our short to ground's here cause We did it here in this particular test scenario. But if we see if we disconnect this circuit there, we have no more test light turned on, cause it's no longer shorted to ground. So that can be a really useful test item to find short to ground without popping a bunch of fuses. Cause if you want to get power in the circuit to check for power, each time you'd have to put that fuse in there. And it probably end up blowing that fuse because of the current state it was in. But we can use our test light to get current through there and check it. Next we're going to show you guys how to perform a voltage drop test. And this is one of my favorite tests for finding difficult issues that can arise with circuits. Cause you could have a circuit that's completed, but still has high resistance or issues with it that can cause strange conditions to occur. So first thing we want to do is we're going to be using the volt meter portion of our test light now to do these tests. So whenever you're doing a voltage drop test, the first thing you want to do as a baseline test. We want to see what the voltage is at the battery. So we've got 12.4 volts right at our battery. We've got this lead on negative than on positive 12.4. We're going to use our test circuit once again. And I want to show you guys something neat. The circuit's complete, all that it needs ground to hook on, and then I'll turn on our board. This board does have a delay in it before it begins to activate the beeping. So we are going to get a little bit of time before it's going to go off on us there. But I wanted to show you guys that while we had 12 volts here at the battery, we check here at the ground connection where it's not disconnect, where it's not connected to ground. It's currently disconnected. Look at this guys. You got about 3.1 Volts there. So we still have some voltage that is present there. And in most cases, you're going to read very close to battery voltage here, unless the resistance gets too high. If we go ahead and clip this on ground, whenever you're checking like a light bulb or any kind of circuit, when you're checking your voltage drop, that can tell you the conditions of your circuit. So we're gonna complete the circuit by clipping this on. That'll complete our circuit here. So now if we check, this is on the ground side here, nothing. It doesn't even light up at all. Because all of our voltage should drop across our load. It should drop completely across here. If you still have voltage present on the other side, that typically indicates that you have a poor connection in here somewhere. I'm gonna go ahead and disconnect it to turn that off. But that usually indicates you've got a poor connection somewhere in here, because there was still some voltage present on the other side of your load. That means that there's corrosion or a bad connection. Maybe you got like two wires are barely touching here. That poor connection there, that high resistance, is actually consuming some of that voltage in order for it to get across that, to get to ground. And that can cause your lights to light up very dimly. If it's a computer module, sometimes it can cause it to wig out to where it does very unexpected things. So by doing your voltage drop test, that's one of my favorite ones to be able to narrow down those issues. And we're going to just run down this circuit here. So we're now at the battery, when we clip on here, we had about 12, four, and it's normal over the length of wire to see about a 10th of a volt drop. So we've got it right here at the battery, 12 three, we're gonna go right just the other side of our circuit protection. And we're right at about 12, 4, 12, 3. We haven't dropped any voltage yet. And then we heard up here to our tester but we can't quite get in there. 12 four still good there. And then we go right onto the other side here while it's activating and we get absolutely nothing. It's completely dropped across the circuit. You always want to see that. If you see something like, maybe you see like 10.4, more than likely, this thing's probably just dropping a little bit of voltage. You've actually really got a major issue on here on the ground side. The more voltage you have on the ground side of the circuit, past the load, the more issue, you know, you've got right here. The other thing we we're checking when we we're checking voltage drop there, we saw that it was nearly 12 four all the way up to our load. Let's say right here at the load, at the light bulb of whatever your load is, you're only measuring maybe like six volts. And of course your lights probably not gonna work, whatever here's probably not working properly. You know, between this point here and the battery up here, you had six volts that has dropped across that circuit. So you need to check the wiring between this point and that point to figure out why that voltage dropped. And again, it's typically going to be caused by a poor connection or heavy corrosion in that circuit. And that completes our look at Performance Tool's LCD circuit tester..


Customer Reviews

LCD Digital Circuit Tester - PTW2992

Average Customer Rating:  4.8 out of 5 stars   (17 Customer Reviews)


by:

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.



by:

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.



by:

Great product at a great price. It sure came in handy. Thank You.


Comments
Just fine. Thank you.
Paul P - 06/14/2021

by:

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.



by:

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.



by:

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.



by:


Comments
Were a shop that specializes in hitch installs and this absolutely helps a ton in diagnosing wiring and testing for shorts in trailer wiring, the volt meter is unique to this brand and we have nearly 7 on hand because of that.
Bauers C - 04/02/2022

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Works great



by:

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



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Great product work well



by:

good product at affordable price,



by:

Great product and excellent service



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17
17

Ask the Experts about this Performance Tool Electrical Tools



  • Trailer Lights Not Working Towed By Ford F-350
    In most cases when some trailer lights work and others don't it is the ground connection on the vehicle side or the trailer side. If your new F-350 has a factory 7-way then the ground issue is probably on the trailer side wiring. You want to make sure all ground connections are grounded to a clean bare metal surface free of dirt or paint. If the ground connections are okay you want to make sure that your trailer side 7-way is properly seated with the trailer connector on the truck. Also,...
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  • 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 lights...
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  • How to Configure Light Wiring on a Truck and Trailer that have Different Color Wires
    Typically the color wiring found on a vehicle and trailer for the lighting is as follows: Green - Right Turn/Stop Yellow - Left Turn/Stop White - Ground Brown - Tail/Marker As you have found, not everybody follows this pattern and so it can be difficult at times to know the correct configuration. What you will want to do is use a Circuit Tester # PTW2992 and test the pins on your truck while running through the different lighting functions. Once you know what the wiring is on your truck...
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  • 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,...
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  • 7-Way on 2016 Jeep Grand Cherokee Not Working After Vehicle Has Been Reflashed
    I am not very well-versed in what is involved with reflashing a vehicle like your 2016 Jeep Grand Cherokee, but I would bet that they probably did not test the functionality of your 7-Way, especially if it was not installed by them. From what I understand about flashing it typically is a hard reset for the computer and should allow your Jeep to read new equipment. They may have needed to turn something on or add software though as well. To test it you will simply need a circuit tester,...
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  • 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...
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  • Trailer Brakes Locking up When Towing with 1987 Ford F-250
    The first thing to do is check the connections to the breakaway switch to ensure they are complete. After that, you will want to use a circuit tester such as # PTW2992 to check for power on your truck's 7-pin trailer connector as outlined in the help article on testing brake controls I have linked. Doing this will ensure everything is operating correctly with your truck and narrow the problem down. Since you mentioned that your wires melted, that could also be an issue if any of the wires...
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  • Tail Lights Went Out on Boat Trailer
    My first thought was to check the grounds and bulbs as well. Another possibility would be if some dirt or debris got in the connector some how. It would be odd for 5 fuses to go out at the same time. If you check the grounds and bulbs on your trailer and they seem to be fine then you will want to start off by making sure your tow vehicle is sending a signal to the connector at the rear. You can test this using a Circuit Tester # PTW2992. If the functions look good on your tow vehicle...
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  • How to Wire Optronics Tail Lights With Three Wires When Trailer has Four Wires?
    To figure out how to wire your new Optronics lights you will need to determine the functions of your 1982 Prowler's wires with a circuit tester such as # PTW2992. The ground wires are likely white, but we can't otherwise go by color scheme because you have an uncommon color pattern, which you can see in the help article on wiring I linked for you. What you'll want to do is hook up your trailer to a vehicle and have somebody engage the tail, turn and brake lights while you use the circuit...
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  • 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.
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  • How to Determine Which Wire is Ground and Which Wire is 12V Power for a 7-Way Connector
    Since your 12V Power is run from the battery to the 7-Way connector, the black wire that is grounded to the vehicle will definitely not be the 12V Power wire. My bet would be that the other black wire that is run alongside the blue wire for your brake controller is the correct wire. You will want to test it with a Circuit Tester # PTW2992 first though to make sure that this is correct since not all wiring is the same color on vehicles and trailers. The 12V Power will need to be connected...
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  • 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...
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  • 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...
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  • 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 help...
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  • Electric Brakes on RV Lock Up When Brake Pedal in Tow Vehicle is Pressed
    This sounds like a wiring problem to me. I would start by checking the connector on both your trailer and your tow vehicle. Look for any corrosion or debris and clean it out. If all of that looks good then I recommend testing your connectors next to make sure that you know which end of your towing setup the problem is occurring on. To test the connector on your tow vehicle simply requires the use of a Circuit Tester # PTW2992 to test the pins on your tow vehicle while the various functions...
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  • Both Turn Signals Come on the Trailer When Only One is Used
    The wiring in your setup definitely has a short somewhere. Start off by checking the connectors on both your trailer and your tow vehicle. Look for any pins that are damaged or any parts that are corroded. Corrosion will look Green or White in color. If those look good then check your grounds. Make sure they are all connected securely and to a bare metal surface. If that doesn't fix it then you will want to test the connectors on both your tow vehicle and trailer to see which one is the...
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  • 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.
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  • How to Test Trailer Connector Functions on a 1996 GMC Topkick
    I may have a solution for you but unfortunately we do not have any wiring diagrams for a 1996 GMC Topkick. If you are trying to figure out how the 7-Way at the rear should be wired we do have a picture which shows what the typical layout is (see attached photo on the right side) but it isn't a hard and fast rule that it has to wired that way. The best way to make sure that the 7-Way is wired how you want it is to simply use a circuit tester # PTW2992 and test the functions of the various...
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  • 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 trailer's...
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  • Trailer Brake and Turn Lights are Always on When connected to 7-Way of 2011 Jeep Liberty
    The next thing to do is to check both the 7-Way on your 2011 Jeep Liberty and the 4-Way on your trailer. Make sure the inside on each is clean and free of corrosion and debris. If that looks good then you will want to test them. You can use a circuit tester, like part # PTW2992, to test the pins on your 7-Way to make sure they are working properly, and a 12V power source, like the battery in your Jeep, to test the 4-Way pins on your trailer. For your trailer you will ground the negative...
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  • No Trailer Running Light On a 2019 Chevrolet Tahoe or Trailer
    It sounds like you could have an issue on the vehicle and trailer. If you are not getting any power to the running light pin on the vehicle side trailer connector this is usually caused by a blown fuse. I checked in the owner's manual for a 2019 Chevrolet Tahoe and it look's like the trailer running light fuse is located in the engine bay fuse box, slot #41. In order to troubleshoot the trailer I recommend you first reground the trailer connector and then apply 12 volt power to the trailer...
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  • Troubleshooting Trailer Left Brake Staying On All The Time
    This type of issue typically indicates a short somewhere on the trailer, but since the same problem pops up with different trailers, we know it's actually coming from somewhere on your truck. Most likely there's some damaged wiring on the truck that's shorting out to some nearby metal, or if this is a new harness install - the left brake light wire is tied to the wrong circuit. What I recommend doing is inspecting any trailer wiring you can access on the truck, looking for exposed or...
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  • Trailer Lights, Driver-Side Running and Parking Light Not Working on 2015 Jeep Wrangler
    Since you are able to get all of your vehicle lights working without the trailer connected, the issue is likely on the trailer wiring. First, check your trailer wiring ground connection for signs of a bad connection. Clean the area around your ground connection to get rid of any paint, corrosion, or other buildup. Make sure the ground wire is securely connected to bare metal on your trailer frame. Next check your trailer 4-way connector for any signs of corrosion on both inside and out,...
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  • Troubleshooting Trailer Electric Brake Assembly Locking Up After Brakes Are Released
    If you only have 1 brake that is remaining locked up then I would start off by looking at that brake assembly, keeping close attention to the wiring itself. It does seem odd that only 1 assembly is staying locked up and the only explanation that I can think of is damaged wiring someone along the line that is continuing to power that assembly. What you can do is reconnect that assembly and then use the manual override on your tow vehicle to lock all of the brakes up. Then let go of the...
    view full answer...


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