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Computer Safe Logistic Probe

Computer Safe Logistic Probe

Item # PTW2991
Our Price: $18.38
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  • Reviews (7)
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  • Videos (2)
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Performance Tool Electrical Tools - PTW2991

  • Testers
  • Circuit Tester
  • Performance Tool


  • Quickly tests high and low voltages on all vehicle circuits, including computerized engine and body controls
  • Tests power and ground voltages
  • Bright red and green LEDs interpret voltage signals such as ground, power and frequency
  • Computer safe, drawing less than 7 milliamps
  • Works on 6, 12 and 24 volt systems
  • Recoil lead wire able to reach 10 feet
  • Heavy gauge color coded battery clips

W2991 Performance Tool Computer Safe Logistic Probe

W2991 Computer Safe Logistic Probe

Installation Details PTW2991 Installation instructions

California residents: click here

Video of Computer Safe Logistic Probe

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

Video Transcript for Performance Tool Wiring - Tools for Wiring - PTW2991 Review

Today we're going to be taking a look at the performance tool computer safe logistic probe. It's going to feature a computer safe design drawing less then 7 mil amps. It will test high and low voltages on all vehicle circuits including computerized engine and body controls. It's going to feature a bright red and green LED. It's going to interpret voltage signals such as ground, power, and frequency. This system is designed to work on 6, 12, and 24 volt systems.

The test probe, that's this portion right here, that's going to measure pretty close to 3 and 3/16 of an inch, right around that area, 3 and 1/8. It's also going to come with your heavy gauge color coded battery clips. A really nice design, easy grip design on those. When the coiled cable or cord is fully stretched out it's going to be able to reach up to 10 feet. When you're ready to use or connect the probe what you'll need to do is you'll need to connect the probe clips to the vehicle's battery. The red clip, again, it's color coded so that's going to go to the positive terminal.

The black clip goes to the negative terminal. You'll need to turn the power on to the component or circuit being tested. Keep in mind the ignition may need to be in on or accessory position. In some cases the engine may need to be running. All you have to do is touch the components circuit wire with the probe's tip.

The LED will glow red if positive source is probed, or green if a negative source is probed. That tip right here, it's going to measure about 3 and 3/16 of an inch long and it's insulated. If the LED does not glow at all the probe may not be making contact with the wire. The wire or the component maybe faulty. Power may not be reaching the circuit or the circuit may not be properly grounded. That's going to do it for today's look at the performance tool computer safe logistic probe.

Customer Satisfaction Score:

Customer Reviews

Computer Safe Logistic Probe - PTW2991

Average Customer Rating:  5.0 out of 5 stars   (7 Customer Reviews)


Exactly what I needed, much better than an old typical test light.


Excellent electrical tester







See what our Experts say about this Performance Tool Electrical Tools

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    Your generation of truck has this issue sometimes and the problem ends up being that the third brake light fuse is blown. This is same circuit as the brake controller stoplight circuit of your truck so what I would recommend is check to see if your third brake lights up when you press the brakes and if not replace the fuse for the third brake light.
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  • Trailer Lights Not Working With 2012 Ford F-250
    I would start by using a Circuit Tester # PTW2991 to test your connection at the truck (4-way or 7-way). This will help you to determine where to begin looking. If you are not getting any lights at the connector, I would first follow the connection and look for damaged wiring or a connection that came undone. If still nothing check your fuses and relays on your 2012 Ford F-250. There are quite a lot of them that are tied into the towing circuits. In the engine compartment fuses 22, 26,...
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  • Troubleshooting Trailer with Brake Lights But No Turn or Running Lights
    That's a very interesting situation because the turn signals should be on the same circuit as your brake lights. Since your 2019 Ram 2500 is pretty new I think the issue is on your trailer, but it would still help to test the connector on your pickup with a circuit tester like part # PTW2991 to ensure you are getting power to your trailer. I have attached photos of which functions should be located on the different pins for both a 4-Way and a 7-Way connector. If you don't get all of those...
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  • Trailer Taillight Running Lights Not Working
    If there are running lights on the trailer and they are working be sure to check your taillight bulbs first. To test the wiring, first you are going to need a Circuit Tester # PTW2991. I have linked our help article on testing the wiring for 4 and 5-way wiring on a trailer. The first place to start would be to test the connection at the truck connector. This will vary from different connectors. On a 4-way connector it is the brown wire that is the female adapter closest to the single...
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  • Troubleshooting Trailer Light Relays On a 2014 Ford F-250
    It sounds like you could have a bad relay. After looking up some information about your 2014 Ford F-250, the relays 74, 75, 76 are for trailer lights. The relays should be in the power distribution box in the engine compartment. You cant test them using a circuit tester like # PTW2993. You will want to check the relays to see if they are operating and if not you can replace the relay (we do not carry the relays). If after replacing the relay you do not have the proper function, then you...
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    The T-One Vehicle Wiring Harness # 118271 does come with all of the fuses and relays for your 2017 Chevy Traverse, but if all of those look good I'm wondering if the issue is on your vehicle side. It's definitely possible that it could be the T-One wiring but I recommend using a circuit tester like part # PTW2991 to see if the locations for the fuses are actually passing the power for the circuit. If nothing is happening at the fuse/relay positions then you'll need to take your Traverse...
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  • Relay Locations for Trailer Running Lights on a 2009 Ford F-250
    If you are getting no signal when testing the running light pin on your 2009 Ford F-250, with a tester like part # PTW2991, then it very well could be a fuse or relay. When I looked up the online owner's manual for your F-250 it looks like you want to check the relays in the #42 and #55 positions in your Power Distribution Box. Let me know if this doesn't fix your issue and I can help you troubleshoot further. I have linked some helpful articles on wiring to this answer page for you to...
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  • P3 Trailer Brake Controller Shows Trailer Connected with No Trailer and Voltage When Moved
    First, if the controller thinks a trailer is connected that is usually because there is something drawing power on the blue wire. To test this, sever the blue wire a few inches from the back of the controller. Then use a circuit tester such as # PTW2991 to test the end of the blue wire coming out of the controller. It should only show power when the manual override is pressed. If it shows power at any other time then there is something wrong inside the controller and it will need to be...
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  • Troubleshooting Taillights for Trailer Wiring on 2012 Volkswagen Touareg
    I have attached the installation instructions for # 118668 below. I do recommend using a Circuit Tester # PTW2991 for testing your connections. This will help ensure your ground connectors are working properly as well. I do not see a black wire with green tracer coming out of the black box. The black wire is the 12V constant power. Your output wires are green for right turn/brake, yellow for left turn/brake, brown for running lights and white is ground. I hope this will help you identify...
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  • Troubleshooting Running Lights Not Working on Trailer Towed with a 2014 Ford F-150
    The easiest way to check and see if something is not working on your 2014 Ford F-150 connector is to use a circuit tester like part # PTW2991 or a multimeter like part # PTW1714 and test the pin for the running lights (see attached pictures). If you are getting power then the issue is on your trailer side but if you don't get power then you either have a bad fuse/relay or the OEM wiring is damaged. When I checked the online version of the owner's manual for a 2014 F-150 the only fuses I...
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  • Brake Controller For 2006 Toyota Highlander
    I never go off the color that the wire is supposed to be. You will want to locate the brake light switch located under the dashboard. Once you have located the switch you will need to identify which wire gets power when the brake pedal is depressed. A Power Probe # PTW2991 will help you to identify the correct wire. The Installation instructions found on the Product Page # C51140 will help you identify the correct wiring required for the Brake Controller installation.
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    It is possible that there is a short somewhere that is intermittently kicking in due to vehicle/trailer position changes as you drive. The likely culprits are the trailer connectors on the vehicle and trailer. You will need to make sure that the connectors are clean and free of corrosion inside and out. To test the controller use a circuit tester such as # PTW2991. Sever the blue wire a few inches from the back of the controller and test the end coming out of the controller while fully...
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  • Finding the Brake Switch Wire to Install a Brake Controller on a 2014 Toyota Highlander
    You have to test the brake switch wires with a circuit tester such as # PTW2991 to determine the correct wire for a brake controller red wire. You want the wire that only has power when the brake pedal is pressed and not with the headlights or turn signals on. On a 2013 Highlander we installed a brake controller on, the brake switch wire was blue. I would start testing with the blue wire on the brake switch if applicable to your 2014.
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    The Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036 will connect directly to the 4-Way on your 1999 Toyota 4Runner 4-Way like part # 118341 and then according to my research you will need to splice the blue wire to a Red/Yellow wire behind either of your tail lights for the reverse light function. You will want to verify this wire color with a circuit tester like part # PTW2991 though as your vehicle is older and some wiring could have been swapped out.
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  • Is there a Standard Wire Color and Function Code for a 7-Way Trailer Connector on a 2005 GMC Sierra
    Yes, there is no standard wiring color code so the wire functions could be anything. The only way to know for sure is to test the wires using a circuit tester such as # PTW2991. The ground will not have any voltage on it, or at least it should not unless there is a short to ground. The other wires will show power when the function associated with each one is activated (running lights, left/right turn and brake lights, reverse lights, 12 volt power which could be on all the time, and output...
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    On your 2018 Chevrolet Suburban if you are using the Tekonsha Plug-In Wiring Adapter # 3016 with your Tekonsha Prodigy P3 # 90195 there is no other connection required. You can check to make sure the fuse # 36 is still in place on your engine compartment fuse block. Be sure to check the fuse to ensure it is not damaged and it is the correct amperage required. A Circuit Tester # PTW2991 can be utilized to ensure that you are getting power at the brake controller wires to determine if...
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  • Only Trailer Running Lights Work with Wiring Harness Installed on a 1994 Ford Aerostar
    It sounds like the wiring harness # C56175 input wires are not connected to the correct tail light wires on your 1994 Ford Aerostar. You will need to make sure and test the tail light wiring for the correct functions. You would need to use a circuit tester such as # PTW2991 to test and verify the functions of the vehicle wiring and then splice in the trailer wiring harness accordingly. On the harness there is a white wire that should be grounded to a clean metal surface. The green wire...
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  • Where to Tap Into Reverse Light Circuit to Install Trailer Connector Adapter with Backup Alarm
    To wire in the reverse light wire on Curt 7-Way connector # C57102 for the back up alarm to work you will need to tap into a reverse light wire behind a reverse light on your 1999 Dodge Ram. If you do not wish to tap into the wire there then you can trace the harness to a more accessible location. Then use a circuit tester such as # PTW2991, to find the correct wire before tapping into it. Be sure that the white ground wire on the 7-Way is attached to the truck frame. Otherwise the harness...
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  • What Is The Best Way To Test Connections To Determine Wire Function?
    The best way to test wire function is to use a wire probe like part # PTW2991. You can use this to test each individual wire or connection and determine its function. For example if you were to put the tester to the yellow wire, and you detect a pulsing signal with the left turn signal applied, then you have found your left turn circuit. You can use this process, and the process of elimination to determine the function of each wire.
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    There are a number of things to check when troubleshooting the left turn/stop and right turn/stop signals not working on your trailer. The first places to start are the connectors on both your tow vehicle and your trailer. Make sure that both are clean and free of any debris or corrosion. If you find something then clean it out and apply dielectric grease # 11755 to help keep the pins in good working order. If those look good then the next step is to determine if the signal is actually...
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  • Troubleshooting NC Connection on Prodigy P2 Brake Controller With Brakes Getting Power
    It sounds like you need to check the tow vehicle and trailer connectors for any corrosion or damage. It is very interesting that your Prodigy P2 # 90885 is reading NC (No Connection) at the same time you activate your trailer brakes. If the trailer isn't connected are you getting 12V of power to the pin in the 5 o'clock position on your tow vehicle? Try testing this pin with a circuit tester like part # PTW2991 to verify this. If there is power coming to this pin without the trailer connected...
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  • Troubleshooting Curt Trailer Connector Reverse Alarm Sounding With Brakes and Taillights
    It sounds like there is a problem inside the connector that plugs into the Curt Trailer Connector # C57101. I recommend using a Circuit Tester # PTW2991 on the 7-way plug and seeing if power is being sent to the reverse lug on the 7-way when you push the brakes or turn on the lights. Be sure to check the ground connections as well when you test the circuit. If you find that there is power going to the reverse circuit when there shouldn't you will want to remove the connector on the 7-way...
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  • Troubleshooting Trailer Disconnected Code for Integrated Brake Controller on a 2017 Ford F-350
    What you need to do is test the 7-Way connector both on your 2017 Ford F-350 and your trailer. Since your F-350 is new I doubt that it is on the vehicle side but you can use a circuit tester like part # PTW2991 and the attached picture of a vehicle 7-Way to make sure that all of the functions are operating properly. To test the 7-Way on your trailer simply take a 12V battery and ground the negative terminal while using the positive terminal to apply power to each pin on the 7-Way. If one...
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Info for this part was:

Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Brent H
Installed by:
Brent H
Employee Mary K
Written by:
Mary K
Employee Zach D
Video by:
Zach D
Employee Erin H
Updated by:
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