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Hook Probe Circuit Tester

Hook Probe Circuit Tester

Item # PTW2993
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  • Reviews (17)
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  • Videos (2)
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  • Why etrailer?

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 Reviews

Hook Probe Circuit Tester - PTW2993

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


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.










Ask the Experts about this Performance Tool Electrical Tools

  • Troubleshooting Left Turn Blinker 4-Way Circuit Not Functioning on 2014 Ram 1500
    Is there any corrosion you could clean off of the connector possibly? Typically when a circuit stops working the issue is fixed by cleaning the connector. It can sometimes also be a blown fuse so you'd want to check the fuse box of the truck to see if the left turn trailer blinker circuit has blown and replace as needed. I attached a help article on troubleshooting 4-way trailer connectors for you to check out as well.
    view full answer...
  • Troubleshooting Right Rear Trailer Light With Running Light Overpowering Brake and Turn
    It sounds like there is a short within the tail light since this is only an issue on the right rear tail light assembly. If you test the wiring using a circuit tester like # PTW2993 just prior to the tail light, does everything work correctly? If so, then you have an internal issue that could be a bulb, or wiring issue. However, if you have the same issue when testing the wires prior to the unit, then you are getting too much power from the running light wiring on that side and you...
    view full answer...
  • Running Light/Parking Light Fuse/Relay Locations on a 2012 Ford F-150
    Are you referring to the lights on the vehicle or the lights on the trailer? Also, I believe you are referring to the parking lights as there are no running lights fuses on your 2012 Ford F-150. If that is the case then for the vehicle side you would need to check the two fuses in the interior fuse box which are a number 30 15 amp fuse and a number 40 10 amp fuse. If you are referring to the trailer side you would need to check one fuse and one relay which are both in the engine bay fuse...
    view full answer...
  • Location of Trailer Running Lights Fuse on a 2008 GMC Sierra
    From what I found you're looking for fuse # 25 in the underhood fuse block. It's labeled "Trailer Park Lamps". If that doesn't fix it clean the trailer connectors on your truck and trailer and make sure they're clean. The running lights are in the 11 O'clock position on the truck and the 1 O'clock on the trailer. You can also test the pins on the truck's connector using a circuit tester, like part # PTW2993. If you have power there then the problem is on the trailer and you'll need...
    view full answer...
  • Running Light Blinks with Turn Signal and No Left Turn/Stop Light
    It sounds like you may have the left turn/brake light signal wire and the running light wire mixed up or they are shorting out into one another somewhere along the trailer. I have attached a photo for you below which shows how a standard 7-way trailer connector should be wired. You will need to make sure the vehicle and trailer side both match but unless the vehicle side trailer connector was rewired at some point it should match this chart. If you have checked the locations of the wires/pins...
    view full answer...
    Image 1 for
  • Troubleshooting 2015 GMC 2500 Factory Brake Controller With No Signal at 7-Way Connection
    There are a couple connections that need to be made to activate your factory brake controller. You will need to attach a couple wires under the hood to give power to your controller. If these are connected then you will want to check the engine bay fuse block for fuse #1 in the micro J-case fuses which is the trailer brake fuse.
    view full answer...
  • Trailer Light Relay Locations on a 2014 Ford F-250
    I took a look at the online owner's manual for your 2014 Ford F-250 and on page 215 is where the fuse and relay information starts. From what I could find it looks like you need to check the relays in positions 29, 74, 75, 76, and 102 for your trailer wiring. This is for the compartment found under your hood. There is also another compartment found on the passenger side behind a panel. This has fuses dedicated to the trailer lights as well. I am not sure if you check these already but...
    view full answer...
  • Troubleshooting Trailer Wiring Where Running Lights Work Intermittently
    Most likely you have some dirt or corrosion on the pins of your trailer connector which is causing an intermittent connection issue on your trailer wiring. Try inspecting the pins of your trailer connectors and clean as necessary and see if that fixes the issue. I also attached a couple help articles on trailer wiring for you to check out as well.
    view full answer...
  • Will Breakaway Pin Being Pulled on Trailer Breakaway Kit Drain Battery
    If you pull the pin of a trailer breakaway kit the breakaway battery is going to lock up the trailer brakes as long as it can till the battery dies. The battery will drain pretty quickly. You'd want to store it with the plunger inserted.
    view full answer...
  • Trailer Fuses in 2014 Ford F-150
    According to the owner's manual a 2014 Ford F-150 has the following fuses or relays for a trailer (the numbers will be their position in the power distribution box): - 6: Trailer tow park lamp - 9: Trailer tow battery charger - 17: Trailer brake control - 21: Trailer tow battery charge relay power - 37: Trailer tow left stop/turn - 38: Trailer tow right stop/turn - 39: Trailer tow back-up lamps - 43: Trailer tow back-up lamp relay power - 67: Trailer tow park lamps relay power - 73: Trailer...
    view full answer...
  • Where Are The Fuses For the Trailer Lights On a 2013 Ford F-150
    The fuses for the 7-way trailer connector on your 2013 Ford F-150 are in the power distribution center as follows: Trailer Tow Brake Control #17 30 Amp Fuse Trailer Tow Battery Charge #21 20 Amp Fuse Trailer Tow Back-Up Lamp #43 15 Amp Fuse Trailer Tow Stop/Turn Lamps #73 20 Amp Fuse Once you check each of the above fuses I recommend you probe each of the pins on the 7-way while the respective signals are active. If none of the pins receive a signal then you may need to take the vehicle...
    view full answer...
  • Trailer Running Lights Not Working on 2017 Ram 3500
    I apologize if any of this is redundant but let's first start off by making sure we are testing the correct pin. The correct pin on the vehicle side 7-way trailer connector for the running lights should be in the 11 o'clock position. The wire that leads into this pin should be brown but it can be a different color. I know you said you have checked the fuse already but again just to clarify you should be looking at the F29 terminal for a blue 20 amp fuse. The fuse may not look bad but it...
    view full answer...
  • How Does Kelsey Energize Brake Controller Remove from Vehicle
    The Kelsey Energize brake controller is a standard electric brake controller which the only thing you need to do to remove it is cut the four wires that it uses to install in your vehicle and tape them up and out of the way. There is no need for any type of vacuum pump in regards to the controller. That is most likely an unrelated issue all together. I attached a diagram that shows how a brake controller wires to a vehicle.
    view full answer...
    Image 1 for
  • Trailer Lights Shut Off When Hazard Lights In Tow Vehicle Are Applied
    I assume you mean that when the hazard lights are applied in the tow vehicle, the lights on the trailer no longer illuminate. If that is the case then what you are going to want to do is check your ground wire connection points. The most common cause we see when lights go out with multiple circuits active is an insufficient ground that gets overpowered and shuts down. I recommend that you run all of the lights on the trailer up to the main ground for the trailer side trailer connector....
    view full answer...
  • Troubleshooting Trailer Running Light Circuit Seemingly Not Active on Truck
    There should be a fuse under the hood of your vehicle that would be labelled trailer running light circuit that you'd need to check, but typically this issue corrosion on the pins of the trailer wiring connector preventing contact. First thing you should do at this point is test the pins of the wiring harness with a circuit tester like # PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks...
    view full answer...
  • Troubleshooting Powered A-Frame Jack that Will Go Up but Won't Retract
    It's the switch of the jack that's at fault since it will go up and not down. If you can get back to me with the brand of jack that you have I can let you know if we have an option but I did attach a link to a page that has all of the jack switches we do offer.
    view full answer...
  • Trailer Running Lights Fuse Location for 2014 Ford F-250
    According to the online version of the owner's manual for your 2014 Ford F-250 there is a 30 amp cartridge fuse located in the #26 position and a relay in the #29 position inside the power distribution box under the hood. These are both connected to the trailer running lights circuit so you will want to make sure they are present and in good condition. If replacing these fuses doesn't fix the issue please let me know and I will be happy to help you further.
    view full answer...
  • Is Trailer License Plate and Trailer Running Light on Same Circuit
    The license plate light is on the same circuit as the running light circuit. If the fuse blew most likely it was related to a short or an over draw on the circuit which may have had something to do with the license plate light. I'd check the wiring that runs to the license plate light to see if you can find a short like cut or exposed wire and fix as needed. I attached a couple help articles on trailer wiring for you to check out as well.
    view full answer...
  • Trailer Running Light Fuse Location for 2013/2014 Ford F-150
    The 2013 and 2014 models of the Ford F-150 do have the same fuse location of 67 for the trailer running lights.
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
    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.
    view full answer...
  • 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...
    view full answer...
  • 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...

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