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Hook Probe Circuit Tester

Hook Probe Circuit Tester

Item # PTW2993
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Performance Tool Wiring - PTW2993
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Performance Tool Wiring - PTW2993

  • Tools for Wiring
  • 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 Reviews

Hook Probe Circuit Tester - PTW2993

Average Customer Rating:  4.8 out of 5 stars   (9 Customer Reviews)

- PTW2993

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.

- PTW2993

Probe works really good

- PTW2993

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

- PTW2993

- PTW2993

- PTW2993

- PTW2993

- PTW2993

- PTW2993


Ask the Experts about this Performance Tool Wiring

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  • Troubleshooting Right Turn Signal Flashing Twice as Fast As Other After Harness Installation
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56272 should not have changed the speed of your turn signal, so I recommend using a circuit tester like # PTW2993 to test the wires. Next I recommend checking the connections for bent pins and using a little dielectric grease # 11755 on the connections to give you a connection free of debris and moisture. Then doublecheck the ground connection on the harness. Make sure the connection is bare metal to...
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  • Troubleshooting Running Light Circuit On 2018 Prime Time Fury Toy Hauler Not Powering Back Up Camera
    I would be happy to help! It sounds like you have a bad ground, as OL on a multimeter means Open Loop which is no continuity. I would move the ground wire to a different location that is corrosion and paint free metal. I would highly doubt that the center market light on your 2018 Prime Time Fury Toy Hauler is not 12v, as I am unaware of any trailer manufacturers using 6 volt lights anymore. Once you relocate the ground to a better surface, let me know if the camera starts working. I...
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  • Trailer Brake Controller Recommendation for 2008 Monaco Camelot Motorhome on Roadmaster Chassis
    We don't have a schematic for the 2008 Monaco Camelot 40 foot, so I can't tell you where that wire is connected. I recommend looking under your dash and using a circuit tester like # PTW2993 to test. You can connect a battery to the 5 o'clock pin of your 7-way and then test for that 12V on wires under your dash. Confirm the correct fit by unplugging battery connection and testing again to confirm no power on that wire. Once you have found the correct wire, you can install your Prodigy...
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  • Troubleshooting 12 Volt Power Trailer Circuit on 7-Way of 2001 Toyota Tundra
    I'd check the back of the trailer wiring connector looking for any cut or exposed wire/corrosion and fix as needed. It could even just be as simple as a dirty pin on your trailer wiring connector or a bent pin. Have you probed the wire that leads to the circuit in the 1:00 position on the trailer wiring connector. This will tell you if the problem is in the wiring or the connector. You can use a tester like part # 3808 for this.
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  • Finding Brake Switch Output Cold Side for Electric Brake Controller on 2010 Jeep Wrangler Unlimited
    The cold side of the brake switch is located behind your brake pedal. You will need to use a circuit tester like # PTW2993 to test the wires to the switch. There will be a constant power 12v that will come into the switch and the wire you are seeking is one that has no signal when the brake pedal is not pressed, but has the signal when the pedal is pressed. So it is cold (not showing power) when the pedal is up and is hot (showing power) when the pedal is pressed. I've attached...
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  • Troubleshooting Wiring Brake Controller Into 2006 Ram Using Factory Wiring Labeled
    Thank you for the picture of the factory brake controller wiring in your truck that I believe is a 2006 Dodge Ram. I can tell you how it's "supposed" to wire up to your brake controller so that we can from there eliminate that as the problem and see where the problem might be. So the wire labeled ground goes to the white wire of the brake controller, the one labeled trailer brakes goes to the blue wire of the controller, the one labelled 30 amps max goes to black wire of the controller,...
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  • Installing Brake Controller in 1999 Toyota Land Cruiser with Factory Tow Wiring
    Because you have a plug under your dash, you will want to use a circuit tester like # PTW2993 to determine wire functions. You will need to find the 12V constant power and that will connect to the black wire of your brake controller. Then you will want to find the wire that only gives signal when the brake pedal is pressed. It should not give any signal without the pedal pressed, but should light up your tester when it is. This wire will connect to the red wire of your brake controller....
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  • Locating Brake Switch Wire on 2016 Mazda CX-9
    To locate the correct brake switch wire on your 2016 Mazda CX-9, you will need to use a circuit tester like # PTW2993 to test each of the 3 wires you mentioned in your question. You are looking for the wire that shows power only when the brake pedal is depressed and not for any other function like turn signals or running lights. I was not able to locate what color this wire might be in your Mazda CX-9, however testing the wires is still the best method as vehicle manufacturers tend to...
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    The typical culprit would be a dirty or damaged trailer connector. Especially if the truck is more than a few years old. Take a look at the pins in the connector. If you see any white or green corrosion on the pins, there is the potential that the corrosion has spread to the interior of the connector and is interfering with the signal from passing through the connector. The # HM40975 would make an excellent replacement.
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    If just the left side tail lights on your trailer are not working, there is likely an issue somewhere along the wiring on that side of the trailer. I first recommend checking the trailer side 7-Way connector for any built up debris or corrosion inside the pins, simply cleaning as needed. If the connector looks okay, check along the trailer wiring on the left side and look for any pinched, frayed, or damaged wiring and replace if needed. Also make sure that the ground wires on the trailer...
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  • How to Find the Cold Side Brake Switch Wire on 2017 Chevrolet Colorado
    The best way to find the cold side brake switch wire in your 2017 Chevrolet Colorado is to simply test the wires using a circuit tester like # PTW2993. You will want to find the wire that only has power when the brakes are applied in the vehicle. Depending on what you are installing, you may also be able to use the bundle of wires that should be located behind the dash, to the left of the emergency brake pedal. This bundle is typically used for installing a brake controller. Looking...
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  • Where is Cold Side of Brake Switch Normally Found
    The phrase "the cold side of the brake switch" refers to the circuit at the brake switch that carries voltage only when the vehicle brakes are applied. This circuit varies widely from vehicle to vehicle so the best way we can recommend you find it is to use a circuit tester like part # PTW2993 to test the wires of your brake pedal switch till you find one that only carries voltage when the brakes are applied and none when released.
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    Most likely you have an issue with the stoplight circuit of your 2013 GMC Sierra not able to tell the brake controller that the brakes are being applied. For your generation of truck this is commonly due to the third brake light or CHMSL fuse being blown. You can check this quickly by pressing the brakes and seeing if the third brake light comes on.
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  • Troubleshooting Brake Controller that Gets Warm to Touch
    How old is the brake controller? Does it still seem to be working properly? Overheating brake controllers aren't common but it would most likely indicate a short. I can help you troubleshoot the controller though. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like part # PTW2993, you should get output to the controller side of the wire...
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    Although the Digitrac brake controller isn't one we carry, I'll do my best to help you troubleshoot it with the information I've gathered. Digitrac brake controllers like the one you have are proportional brake controllers, this means that it senses the vehicle's deceleration and applies the brakes in proportion to your vehicle's braking action. Therefore, it is completely normal for a proportional brake controller to activate the trailer brakes only when it senses movement. The manual...
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    There are a few possible reasons why the trailer running lights aren't working with the connector on your 2006 Nissan Murano. It sounds like you may have already done this, but if not, I recommend starting by testing the connector itself on your Murano with a circuit tester like # PTW2993. Test the running lights pin on the connector with this function activated on the vehicle to see if you get power there. If you don't get power, you at least know the issue is somewhere on the vehicle....
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  • Difficulty Locating Cold Side of Brake Switch Wire on 2004 Toyota Highlander
    When locating the cold side of the brake switch wire on your 2004 Toyota Highlander, you will need to find the wire that only receives power with the brake pedal depressed and not during any other function. You can use a circuit tester like # PTW2993 to test each of the wires you mentioned in your question. I recommend starting by testing the black wire at the brake switch above the pedal. The brake switch circuit is typically found near the brake pedal in the vehicle. If you are unable...
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    The first thing to check is the center pin of your 7-way when your vehicle is put in reverse. This pin should have 12V power when put in reverse and no signal when the vehicle is not in reverse. The easiest way to check this is using a circuit tester like # PTW2993. If you have this function on your vehicle, then you likely have a ground issue on your trailer. If you don't have this function, then you will need to trace your reverse light function wire to find the short by probing every...
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Rachael H
Expert Research:
Rachael H
Employee Tyler C
Edited by:
Tyler C
Employee Dustin K
Video by:
Dustin K
Employee Shane H
Video by:
Shane H
Employee Cole B
Installed by:
Cole B
Employee David F
Installed by:
David F
Employee Jacob H
Installed by:
Jacob H
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Erin H
Written by:
Erin H

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