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Hook Probe Circuit Tester

Hook Probe Circuit Tester

Item # PTW2993
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  • Reviews (17)
  • Q & A (0)
  • 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 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...
    view full answer...
  • Troubleshooting Trailer Running Lights Fuse Location on 2014 Ram 3500
    According to the owner's manual for your 2014 Ram 3500 the trailer running light fuse is in location F29 under the hood. It takes a 20 amp yellow cartridge fuse. There is also a fuse for the Trailer Tow Receptacle in location F30. It takes a 30 amp pink cartridge fuse. You can use a test light like # PTW2993 to check fuses when installed by just checking each individual side in the holes on the face of the fuse itself.
    view full answer...
  • Testing Wiring Functions For Replacement Dome Light
    For your dome light, the in-line bulb if it didn't have a separate ground, would need to have one wire be positive and one wire ground. Before connecting the light, hold the positive wire to the windshield side wire and the negative wire to the rear facing connection. If the light functions properly, then this is the way to wire it. If there was a separate ground on your old light, then run a wire from each side to the positive wire of the new dome and hold the ground to a separate bare...
    view full answer...
  • Can Solar Panel be Ran to Trailer Batteries Wires in Series
    Assuming your trailer runs off 12 volts (I am sure it does), you would need to run your solar panel power to the batteries in series like the picture I attached. The positive side of the one batter gets the positive wire of one battery and the negative of the other gets the ground wire.
    view full answer...
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  • How to Use 7-Way Connector to Install Additional Reverse Lights on 2014 Chevrolet Truck
    When installing the additional LED reverse lights on your 2014 Chevy, you can tap into the 7-Way on the vehicle by connecting to the center pin's wire at the back of the connector. This is typically the reverse light circuit, although you can double check by using a circuit tester like # PTW2993. Once connected, this will power the lights only when the truck is in reverse. You will also just need to make sure that the new lights are grounded properly, either through the mounting hardware...
    view full answer...
  • Safe Way to Wire in Second Battery for Travel Trailer
    You can double the life of your battery basically by running them in parallel and you'll still get the 12 volt output you'd need. If your trailer is designed to be used with 12 volts you cannot double the voltage by running them in series to give you 24 volts. You'd want to run them in parallel. I attached a picture that details how both are accomplished. You want to use the diagram on the right.
    view full answer...
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  • Where Does 12 Volt Accessory Wire Run to on Trailer Wiring
    Sounds like you are talking about the 12 volt accessory circuit of a 7-way and are asking about where it would need to get ran. Normally this circuit goes to the positive post of a trailer battery and is used to keep the battery topped off but it can also be ran to power exterior or interior trailer lights.
    view full answer...
  • Should Brake Output Pin of 7-Way Have Voltage When Brakes are Applied without Trailer
    Yes, if you test your brake controller output pin on your 7-way for voltage with the brakes applied and the gain set to the max you would see a full 12 volts. You should be able to adjust the gain to get varying voltages.
    view full answer...
  • Determining Wire Functions on Old Horse Trailer
    Wire colors are not always the best method for determining functions. The color wires you mentioned having on your trailer are not standard, but even when looking at standard wire colors, it is always best to actually test them to ensure you are making the correct connections. Trailer manufacturers will sometimes use different wire colors and a previous owner may have installed aftermarket wiring, so going by wire color alone can lead to issues. I recommend testing all the wires on your...
    view full answer...
  • Troubleshooting Horse Trailer that Locks Up Trailer Brakes When Connected to Truck
    This is a fairly common problem with horse trailer wiring. The problem is that there are two accepted ways to wire up a 6-way connector and the only difference is that the brake output signal and the 12 volt signal are swapped. Which means that if you have a trailer wired one way and a truck the other way you end up with the brakes locked up all the time. What you need to do is swap those circuits and it'll work like it should. I attached a picture of a 6-way for you to check out as well.
    view full answer...
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  • Troubleshooting No Power to Right Turn Signal on Trailer with 2006 Ford F-150
    If you are getting no power at the connector for the right turn signal on your Ford F-150, it's possible that there could be a missing or damaged fuse/relay that is specific to the tow package wiring. Based on my research, the trailer tow right turn/stop lamp fuse is a 10 amp fuse located in the number 36 position on the fuse panel/power distribution box. You can also review your copy of the owner's manual to verify this. Also check to make sure both the vehicle side and trailer side...
    view full answer...
  • Troubleshooting Right Tail Light That Stays On and Flashes When Brakes Are Applied
    It sounds like the right turn signal wire on the trailer may have somehow been shorted to the running light wire, which is what is causing the light to stay on. I recommend checking these and the other trailer wires for any damaged or exposed areas that might be making contact with another wire or bare metal surface. Also check to make sure that the connector itself is free of any dirt or debris, as this may also cause a short. Lastly, make sure all your ground connections are secure and...
    view full answer...
  • Solution for Determining Functions of Unknown Trailer Connector Wire Colors
    Wow, that is quite the 4-way setup. It appears to have two wires ran to the right turn/stop circuit (white blue pin), a brown wire ran to the left turn/stop circuit, a pink wire ran to the running light circuit, and a gray and white wire ran to the ground circuit based on the standard pin out of a 4-way flat. Since that's really unusual you would want to verify what all those circuits do by running a jumper wire with 12 volts on it from a vehicle positive battery post to each pin. With...
    view full answer...
    Image 1 for
  • Recommended Light Fixtures for 1992 Winnebago Brave Motorhome
    As you mentioned, most of our motorhome light fixtures have a 2 wire system versus a 3 wire system. If you are connecting the two wire systems, you will only connect the black wire to power and the white wire to ground. Most likely that 3rd wire is just another secure ground, but I recommend using a circuit tester like # PTW2993 to confirm. I've attached the link to all of our options.
    view full answer...
  • Troubleshooting Running Lights Not Working When All Other Functions Work
    When you have a single wiring function not working, it is best to use a circuit tester like # PTW2993 to determine if you have proper signal and ground connection. With one function not working, it could be a short in the power wire, a faulty ground connection, or a combination of the two. It is also possible that a fuse in your vehicle has blown and needs to be replaced. I've attached a video to assist in using the tester. I recommend starting with the circuit tester to check wire...
    view full answer...
  • Troubleshooting SurePull Digitrac Brake Controller
    Unfortunately I can't look up the manual for your unit as it is a part we don't carry to see what that error message is. I can tell you the C you were seeing before in most cases simply meant the trailer was connected. The symptoms you are describing with not enough and then too much brake makes me think that you either have a short in your brake output wire (normally blue wire) to your trailer connection or the unit itself is failing. You can use a circuit tester like # PTW2993 to test...
    view full answer...
    Image 1 for
  • Turn Signals Reversed On Trailer Only When Running Lights Are On
    It sounds like there is a ground issue on the trailer, which can cause all kinds of strange things to happen with regards to the signal lights. The reason it is only showing itself when the running lights are on, is because of the additional load they are putting on the system. The current ground may be strong enough for the turn signals to activate properly by themselves, but when an additional function is activated, there is not enough power for everything to function properly. I recommend...
    view full answer...
  • Troubleshooting No Trailer Lights At All When Connected To Truck
    The first thing to check if you have zero lights is your fuses. Your owners manual will give you locations to check. After that, I recommend using a circuit tester like # PTW2993 to individually test the pins on your trailer connection for function when the trailer is not connected. We can do further troubleshooting once you've taken these two steps if the problem is not remedied.
    view full answer...
  • Should 12 Volt Power Circuit of 7-Way Charge Trailer Battery
    The difference between 11.56 and 11.58 volts is pretty small relatively speaking. The truck SHOULD be putting a maintenance charge on the battery as you are towing, but the amount of voltage that circuit puts out isn't so large that it will make a huge difference. Test the 1:00 pin of your 7-way for voltage with a circuit tester like part # PTW2993 to see if its active.
    view full answer...
  • Troubleshooting Fuse that Blows Only When Making Sharp Left Turn with Trailer
    The fact that the fuses in your truck are blowing only when making a sharp left turn leads me think there are a couple possible issues that are causing this. The first thing I recommend checking is the length of wire you have, specifically where the trailer and vehicle connectors attach to each other. I am wondering if it isn't quite long enough between your Silverado and trailer and when you make a sharp left turn, it is causing some wires to pull or the connector to twist a bit, leading...
    view full answer...
  • Troubleshooting No Power at Running Lights Pin on 2013 Sierra 2500 Trailer Connector
    Since you already replaced the running lights fuse in your Sierra, I recommend looking at the vehicle side connector. Check to make sure there is no corrosion or dirt buildup inside the pin in question, simply cleaning out as needed. Corrosion and debris inside the connector can lead to a short and cause the issue you described. Also check to make sure the wiring harness is grounded properly. A poor ground connection can prevent certain light functions like the trailer's running lights...
    view full answer...
  • Determining Wire Functions on 2004 Nissan Frontier
    If you are needing to determine the wire functions on your 2004 Nissan Frontier, I recommend testing them each for function with a circuit tester like # PTW2993. Vehicle manufacturers tend to switch the wire colors they use so going by color alone is not always the best method. You can have a buddy sit in the vehicle and activate each function while you test the wires. I have attached a wiring diagram of how a typical vehicle-side 7-Way connector will be wired that you can use for reference.
    view full answer...
    Image 1 for
  • Should 12V Pin On Vehicle Side Connector Have Constant Power
    The 1:00 pin on your truck's trailer connector is designated for the 12V power circuit. It's very possible that the wiring on both of your trucks is actually correct. Some vehicles will have constant power while others will not, but neither situation necessarily indicates an issue. If the 12 volt circuit is hot all the time on one of your trucks, even with the ignition off, this is normal and you do not need to worry about the battery draining. When this is the case, you essentially have...
    view full answer...
  • Troubleshooting Chevy Silverado Integrated Trailer Brake System with Error Light
    It is highly likely that you have a short circuit or a bad ground in your system to create that error. The system should reset itself when the problem is fixed, so I recommend using a circuit tester like # PTW2993 and going through the wiring functions of your brake controller so you can find the issue. I've attached an article to assist in testing the functions of a brake controller whether it is an integrated controller or not.
    view full answer...

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