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Hook Probe Circuit Tester

Hook Probe Circuit Tester

Item # PTW2993
Our Price: $14.94
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  • Reviews (21)
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Performance Tool Electrical Tools - PTW2993

  • Testers
  • Circuit Tester
  • Performance Tool

  • Circuit tester easily identifies shorts in 6V, 12V and 24V circuits, fuses, test connections, and wiring harnesses
  • Wire-piercing molded hook locks onto wires to free your hands while working
  • Extended molded hook allows for testing in confined spaces or with limited access
  • High-intensity light bulb
  • 4' Long cord is insulated and resistant to oil and heat

W2993 Performance Tool Circuit Tester

Replaces Draw-Tite 3808

California residents: click here

Video of Hook Probe Circuit Tester

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

Video Transcript for Performance Tool Hook Probe Circuit Tester Review

Hi there, do-it-yourselfers. Today, we're gonna be taking a look and covering some of the features of Performance Tool's, hook probe circuit tester. A test light's a great object for verifying whether you've got power and ground at a specific location. It's also really useful if you're setting up lights on your vehicle for trailer lighting, so you can test your circuits and get those installed. So real quick, we're just going to show you here, how it works, one end needs to have ground, and the other end needs to have power in order to light the light. So we're gonna take the clip end here, we're gonna put this on the negative side of our battery for brown.

And then if we press in on the plastic sleeve here, that'll expose the probe at the end. We're just gonna touch this to the positive side. You can see there that it lights up our test light. This will also work if you we're to hook it up backwards. So if he's got the clip on power and you we're to use your probe and touch any ground point, it should also light up.

So you can see your ground on the battery or ground over here on anywhere on the vehicle frame or anything like that. Lets see if there's a bolt right down here. Look at that there, we got the power, it's lighting up our test light because that's ground and we've got power coming from the clip side. Our customers typically use these to check their circuits, especially if they're either setting up a four-pole connector on their vehicle, or if they've recently just taken their vehicle and they hooked it up to their trailer and they found, "oh no, the lights aren't working on my trailer." Well now you've got to figure out why the lights don't work and the test light can be a great tool to help you determine that. One of the first things that I would do if I had an issue with my trailer not working properly is I wanna verify is the issue with my trailer, or is it with my vehicle And I'd start here on the vehicle and check this out.

So we've got our four pole tester here which gives us all of our necessary lighting signals, in order to get these to operate without an assistant, we can go ahead and turn on our hazard lights that will operate both the left and the right turn signal. And we can go ahead and turn on our tail lights for our last circuit, the fourth circuit there is your ground and that's the exposed lug there. We went ahead and used the clip to clip it onto the ground side. So now we've got those lights operating. We should get some signals from the first one here next to it's going to be our tail lights.

We should have a constant voltage it should light up our light and look at that, there we go. So we know our taillight signal is working properly on the vehicle. Next is the yellow circuit, which is our left turn signal. And we can see it's flashing, so we know that our left turn signal is working properly. And lastly is the green circuit that's our right turn signal and it's working as well. So we plugged this vehicle into a trailer and the trailer doesn't function, there's some issues on our trailer side, maybe there's a ground missing to the light that's not functioning or maybe there's just an open and the power circuit go into it. But we know, at this point that our vehicle is working properly and we can continue the diagnosis over on that side. And while we we're showing it off on a four-pole here, it's also great for testing out your six and seven-pole connectors as well. You just need to make sure you've got a way to activate the particular circuits to make sure they're working. For example, like your seven way, your auxiliary circuit probably is going to have 12 volts on it at all times, but some of those require the vehicle to be started in order to get that 12 volt output. Likewise, your brake output circuit for your trailer brakes aren't gonna activate unless you've got an assistant inside either pressing the brakes or activating the manual slider. But if you've got somebody to help you out, you can check all those circuits with this as well. So now, since we know that our problem is not with our vehicle, you can go ahead and plug your vehicle out to your trailer, or you could use a test box. We've gone ahead and plugged up and got our tail lights turned on and our light here is not functioning. So let's check our circuits and see if we can figure out the issue. I've gone ahead and clipped the wire there where the ground wire was attached. We could potentially just have an issue with our ground, but we're gonna go ahead and use that and see if we can get a reading here. So here's our two circuits coming from the front, you got a green wire there and a brown one. Brown is your typical color for your taillight circuit. So I'm just gonna push this away from the probe there. Gonna slide it over and then I'm now letting it return. And we're gonna stab into the wire. And with our taillights on, if we've got a good ground here at the back, we should get a reading. Now, even though brown is the most common color, that's not always the case though sometimes it can be another color. So we have nothing here. So we're just gonna go ahead and probe the other wire. 'Cause even though brown is the most common, it doesn't necessarily mean that the manufacturer, followed that particular color coding. So now we are on the other one, we're gonna probe into that one, and we've got nothing on that one either. So that probably leads us to believe that we either have a short from, other than just to believe that we have an open in our circuit here preventing current from getting to the back or that we've potentially got a bad ground here at the back. We're gonna take that clip off the ground circuit, where we had it, where it was getting ground from before. And we're gonna move it to a new spot here on the trailer. 'Cause we should have good ground just about anywhere on the frame, as long as the paint's not too thick. And look at that, we moved it over to the other stud there. We kinda rocked it around to clear up some of the rust on it and we've got power which we now know that from the vehicle all the way back to our circuit here is good. So the only issues that's potentially left is our ground or the bulbs could be burnt out. But since we moved our circuit from where the ground wire is here over to a different spot we got our lights light up. I suspect our issue is more than likely with our ground here. So we're just gonna go ahead and tighten the circuit up, kinda clean up that rust there and see if we can't get this light to come back on. And that's all it took, I just took that bolt loose. I knocked some of the rust off with a wire brush, re-installed it and now our light's functioning. So you can see our test light was able to help us determine that the issue was on the trailer side and also figure out where that issue was. And that completes our look at Performance Tool's, hook probe circuit tester..

Customer Satisfaction Score:

Customer Reviews

Hook Probe Circuit Tester - PTW2993

Average Customer Rating:  4.8 out of 5 stars   (21 Customer Reviews)


I bought this prob/circuit tester in order to make some minor electrical repairs to our Scamp 13. I carry it along on all our trips. It has been tremendously helpful isolating shorts that result from vibration and wear and tear. Furthermore, the tutorial videos here on etrailer have been equally helpful.


I have yet to use it. It looked like something I should have so I ordered one.


Easy to use and definitely helpful when looking for a specific wire.


Probe works really good

Tester has worked out really well, only used it a few times
Terry - 03/19/2022


Looks good, haven't used it yet


Works perfect


This will be very handy when working with circuits.


Nice tool to own!


I had a tester like this years ago and I broke the end off.
I really liked the tester as you can hook it over a wire and probe it to see
if you have voltage.
Been looking for one for a long time.
You can find cheap junk ones but this one is just like the good one I had years ago.
Glad I found it and is is very well built.
Should last me a long time.
Was shipped fast also.
Will try and not break this one.
Thanks e trailer.


Works Fine
Ricky L - 01/26/2022




Very friendly service, thank you Korren. Ordered on Tuesday, received on Thursday.










See what our Experts say about this Performance Tool Electrical Tools

  • Troubleshooting a Brake Controller not Lighting Up When Connected
    Sounds like the problem is the new trailer. The wiring on the trailer could be loose or broken. This could also include a faulty ground connection. I would check the grounds first, then the 12-volt hot wires, and then check and see if there are any breaks or loose connections in any of the other wires. You might need a circuit tester like # PTW2993, to test the various components. If everything checks out you might also check to see if you have blown a fuse which is a possibility, especially...
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  • Trailer Lights Malfunctioning with 4 to 7-Way Adapter on a 1992 GMC 1500 Sierra
    I will start from the top as far as the best order for finding the problem. The first thing to do is disconnect the 4 to 7 Adapter and test the 4-Way T-Harness. Use a circuit tester, like part # PTW2993, and check each pin of the 4-Way. Connect the alligator clip to the exposed ground post, white wire. Turn on the truck headlights and probe the brown pin. Turn on the left blinker and check the yellow wire pin and do the same for the right blinker and green wire pin. If everything checks...
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  • How to Wire SuperWinch LT2000 and Install On a 1997 Honda 300 4Trax
    To connect the hot wire or Red wire of the Rocker Switch, you will connect it to the wire in the ignition switch that only is powered when the ignition is in the ON position. To determine which wire this is, you will need to use a circuit tester, item # PTW2993. If there is a headlight mounted between handlebars there is easily easy access to an ignition source inside headlight housing. Then, you will connect the Green wire on the rocker switch to the Green wire on the Solenoid. The Black...
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  • Troubleshooting Turn Signals that Both Come On when One Blinker Is Activated
    What that means is that the turn signal circuits have somewhere shorted out to each other on either the wiring of the towed vehicle or the tow vehicle. The easiest way to determine where the problem is is to use a circuit tester like our part # PTW2993 on the connector of the tow vehicle to test to see if both circuits activate when one blinker is applied. If so, the problem is the tow vehicle and you will want to check the installation of the wiring harness looking for corrosion, cut or...
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  • How to Determine Wire Color Functions of Trailer When Replacing Lights
    You would have to use a circuit tester like part # PTW2993 to test the two black wires on your trailer to see which carries the voltage for the circuit and which is the ground. You could also trace the wires to see where they go to determine this as well. The LED wiring should be red for power and white for ground.
    view full answer...
  • Troubleshooting Trailer Taillights that Stop Working When Headlights are On
    Your main problem is an insufficient ground for the trailer wiring. Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground...
    view full answer...
  • Best Way To Check Brake Light Signal For An Electric Brake Controller On A 1997 Ford Explorer
    When checking the wires associated with a brake controller, you should use a incandescent circuit tester like # PTW2993. This will actually cause a power draw on the wire to light the bulb and give you an accurate visual of if the system is functioning correctly. You will need a 12V power for the brake controller to work. I can confirm you are testing the correct wires and that the green wire will connect to the red wire on your brake controller. If the incandescent circuit tester...
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  • Fuse Blows When The Husky Brute Jack Is Plugged In And Operation Switch Is Used
    Husky Brute Electric Trailer Jack - Drop Leg - A-Frame - 18" Lift - 4,500 lbs, # HT87247, has a built in ground through the unit itself to the trailer and connects to power via the wire. It has an inline circuit breaker that you can install that should keep any fuses from blowing. Since you are having an issue with the fuse, there is an issue somewhere in the circuit meaning there is either a broken wire or there is a faulty ground. I suggest using a circuit tester like # PTW2993 to...
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  • Troubleshooting Trailer Wiring that Stops Working When Headlights Are On
    Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface. What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem.
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  • Discontinued Drawtite I-Command Brake Controller Error Code
    On the Discontinued Draw-Tite I-command Brake Controller 5535, the manual says the error is the brake controller is "seeing" an overload condition during operation. If it is reading overload without the trailer connected then that means there is a short in the blue trailer feed wire on the vehicle. You will need to check this wire for a short using a circuit tester like # PTW2993, and replace the wire where any issue is found. If you can't find the point along the wire, I recommend...
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    Image 1 for
  • Installing Wireless Back Up Camera on Trailer so Camera is Constantly Powered On During Travel
    Most backup camera systems can stay on at all times without weather being an issue. You will need to wire the camera power to a constant power supply like the running lights instead of the reverse function which only comes on when you shift into reverse. You can use a circuit tester like # PTW2993 to determine the running light circuit and splice the camera power into that wire. Make sure you have a clean metal to metal ground connection as well.
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  • Wiring Colors At The Trailer Connector On The Back Of A 2007 Chevrolet Silverado Classic
    The wiring of a typical 7-way trailer connector is color coded and standard for factory wiring as well as aftermarket application. I've attached a photo to help. If the colors don't match up, you will need to text function based on location using a circuit tester like # PTW2993. Let me know if you need further help.
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    Image 1 for
  • Right Signal on Trailer When Either Signal is Activated
    Sounds like somewhere on trailer the left and right turn circuits are shorting out to each other. Most likely this is on the trailer side, but you can use a circuit tester like part # PTW2993 to test both turn signal pins to verify that either carries the right voltage when applied like the video I attached.
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  • Trailers Right Tail Light Stays on Even While Unplugged
    The most likely scenario that would lead to your right tail light staying on even after it is unplugged is that somewhere along the wires running through your trailer, there is an inadvertent bare connection between your right tail light wire and the power wire that connects to the battery. There could also be a few loose strands in the trailer connector or junction box (if you have one) that is allowing the circuits to touch. Another thing that we have seen is if the power wire is shorting...
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  • Where do Trailer Wire Colors Green, Yellow, Brown and Red Run To
    Most likely the colors would match with the exception of the red wire on the trailer going to the white wire on the truck. The white wire is the ground circuit so you can trace the RED wire on the TRAILER to see if it attaches to a metal surface on the trailer or to the grounds of all the lights. I attached a help article on trailer wiring for you to check out as well.
    view full answer...
  • Troubleshooting Brake Controller that Only Works with Override Lever
    Sounds like the problem is that you aren't getting a stoplight circuit activation on the red wire of the controller. If you test the red wire of the controller with a circuit tester like part # PTW2993 does the circuit tester show that voltage is applied? If so then the controller is in need of replacing. If not then the problem is most likely a blown third brake light fuse.
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  • Troubleshooting Running Light Circuit that Doesnt Work on One Side of Trailer Lighting
    It's either a broken connection between the harness and the light or a bad ground on the light which seems unlikely since turn/brake signal works. What you will want to do is use a circuit tester like part # PTW2993 and test the running light circuit by probing the wire from the connector all the way back to the light. You should find where the circuit is active and then where it stops and be able to determine where the connection is interrupted.
    view full answer...
  • Troubleshooting Running Light Circuit Not Functioning on Trailer Wiring
    Typically it's just corrosion on the connector that causes one of the pins to not function. Have you tried cleaning the pins of the connector to see if that allows the circuit to function? Is the pin bend possibly? Have you tested for voltage on that pin behind the connector feeding into it? If there is voltage there then the problem is in the connector most likely. If not, then the problem would be a bad fuse most likely under the hood of the vehicle.
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  • Troubleshooting Trailer Taillight that Stops Working When Brakes are Applied
    Sounds like a weak ground for that light assembly. Check to make sure the light is grounding to a clean metal surface. What happens is that the circuit's ground can't handle the additional amperage draw due to the weak ground and it just turns off all together.
    view full answer...
  • Troubleshooting Trailer Lights Not Working When Headlights are Turned On
    With your headlights on, test your trailer connections at your vehicle side plug at the bumper using an incandescent circuit tester like # PTW2993. This will help us know if there is an issue in the vehicle wiring. If this checks out, you can test your trailer wires right behind the connection to see if there is an issue at the connection itself. If this is good, you will most likely have a ground issue on your trailer and you will want to make sure you have a solid metal to metal connection...
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  • No Power from Ford Brake Controller to 7-Way Trailer Connector on 2010 Ford F-150
    I think this might be the ultra-rare Ford dummy harness issue. A few years ago I had a customer with a similar problem. It took days of troubleshooting and a savvy Ford tech at a dealership to determine that the harness behind the dash that the controller plugs into was not a complete harness so that could be what is going on. Ford would have to provide the harness. If you have the correct harness, which is likely given how rare this issue is, then it could be another problem with bent...
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  • Troubleshooting Gooseneck Trailer Brake Lights that Stay on all the Time
    It sounds like the 12 volt accessory circuit of the trailer connector on either the truck or trailer side has shorted out to your brake light or running light circuit and it's activating the circuit all the time. Typically it's corrosion on the front or the back of trailer connectors that causes this problem so that is where I would start first. To isolate the problem to either the tow vehicle or the trailer you can use a circuit tester like part # PTW2993 to test for voltage on the...
    view full answer...
  • Does a Breakaway System Battery Affect Everyday Trailer Brake Performance
    Electric trailer brakes can work on a trailer that doesn't have a breakaway system. So the answer to your question is no, the breakaway battery would not affect how normal trailer brakes will operate under normal circumstances. The only time the breakaway battery will change how the brakes are performing is when the pin of the system has been pulled and the voltage of the battery is being applied to the brake assemblies. I attached an FAQ on breakaway systems plus an FAQ on troubleshooting...
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  • Troubleshooting Left Stop/Turn Light Not Functioning On Trailer
    Sounds like you are trying to figure out why the left brake light on your trailer isn't functioning but the rest of the trailer lighting seems to be working. Typically this problem is due to a bad ground on the light assembly. The light grounds should be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt...
    view full answer...

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