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Computer Safe Logistic Probe

Computer Safe Logistic Probe

Item # PTW2991
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Wiring PTW2991 - Circuit Tester - Performance Tool
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Lowest Prices for the best wiring from Performance Tool. Computer Safe Logistic Probe part number PTW2991 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Performance Tool Wiring - PTW2991

  • Tools for Wiring
  • Testers
  • Performance Tool
  • Circuit Tester


  • 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 Reviews

Computer Safe Logistic Probe - PTW2991

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

- PTW2991

Excellent electrical tester 395826


Ask the Experts about this Performance Tool Wiring

  • Trailer Light Wiring Diagram for 7-Way on a 2019 Chevy Silverado 2500
    According to my research the following wires for the 7-Way on your 2019 Chevy Silverado 2500 should carry the following functions: Green OR White/Green - Reverse White - Ground Blue - Brake Controller Green OR Green/Purple - Right Turn/Stop Red/Black OR Red/Green - 12V Power Brown OR Gray/Brown - Running Lights Yellow OR Yellow/Gray - Left Turn/Stop The reverse light function green wire should be slightly larger than the green wire for the right turn/stop function (if you have...
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  • Troubleshooting 7-Way Connector Not Working on a 2000 Chevy Silverado 1500
    If your trailer is working properly with other vehicles then the problem is definitely on your 2000 Chevy Silverado 1500. The fuse that you referenced I believe is for the 12V power but I could be mistaken. I tried looking up the online owner's manual but it didn't really identify the various fuses with numbers. With that being said, the best place to start is right at the 7-Way connector on your Chevy. Using a circuit tester like part # PTW2991 or a multimeter like part # PTW1714 check...
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  • Fuse Location for 7-Way 12V Power Pin on a 2010 Ford F-250
    Check fuse 44 in the fuse block under the hood of your 2010 Ford F-250 as well as the relay in position 56. According to the online version of your owner's manual these are also related to the 12V power pin on your F-250. If those look good then the next thing you can do is use a circuit tester with a probe like part # PTW2991 and check the 12V wire from your 7-Way to your battery. Replace any pieces that are damaged or pinched with 10 Gauge Wire # 10-1-1.
    view full answer...
  • 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...
    view full answer...
  • 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...
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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...
    view full answer...
  • Locations for Left and Right Turn/Stop Trailer Fuses on a 2011 Ford F-450 Super Duty
    I took a look in the online version of the owner's manual for your 2011 Ford F-450 Super Duty and it looks like the right turn/stop is fuse location 13 while the left turn/stop is fuse location 14 in your passenger compartment fuse box. In the power distribution box (under the hood) the left turn/stop is location 74 while the right turn/stop is location 75. I recommend verifying this in your copy of the owner's manual. If these fuses look good but you still aren't getting a signal...
    view full answer...
  • 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...
    view full answer...
  • Furrion Backup Camera for 2014 Rockwood 5th Wheel and 3rd Brake Light Camera for 2012 Ram 2500
    I believe that you are correct about the wiring you found. You would want to test it with a circuit tester # PTW2991 though before installing the Furrion RV Observation Camera System # FOS07TASF as I am not sure what the wiring layout is for your 2014 Rockwood Signature Ultra Lite 8289WS 5th wheel. You definitely can use the Truck Bed Cargo Camera for Factory Monitor # 3460015 which comes with the toggle switch so you can choose which camera input you want to view on your factory in-dash...
    view full answer...
  • How to Change Out 4-Way at Rear of Motorhome to Work with 7-Way on Trailer
    Thank you for the pictures! What you may be able to do is install the Hopkins # HM47210 on your motorhome to replace your current 4-Way round connector. I'm guessing the 2 wires for your brake controller system are for 12V power and for the brake controller signal. If this is the case then you will need to connect the following functions on your motorhome wiring with the following wires from the Hopkins connector: White - Ground Yellow - Left Stop/Turn Green - Right Stop/Turn Brown...
    view full answer...
  • Parts Needed to Install Brake Controller and Wiring on a 2017 Chevy Express 3500 Van
    I will be happy to help you find all of the parts you need to tow your trailer with brakes using your 2017 Chevy Express 3500 Van! To install a fully functional 7-Way connector, and ultimately a brake controller, on your Express Van you will need 4-Way wiring that carries the basic trailer light functions and the Universal Wiring Kit # ETBC7. For the basic light functions I recommend going with the T-One # 118392 which simply plugs in behind your tail lights (see attached installation...
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  • Troubleshooting Danger Notification and No LED Light on Curt Echo Brake Controller
    Sine the LED does not light up on your Curt Echo # C51180, that means there's no power getting through to it. Given the fact that the Echo was receiving power and working properly at one point, chances are you're dealing with a poor ground issue. I would start by checking the power and ground circuits on your Ram's trailer wiring. These will be on the 1 o'clock and 7 o'clock positions, as shown in the attached diagram. You can use a 12V probe-style circuit tester, like # PTW2991 to check...
    view full answer...
  • Troubleshooting New Brakes That are Weak After Adjustment
    If you have adjusted your Dexter Electric Trailer Brake Kit # 23-26-27 properly and you are getting no braking power with your override manual while your trailer is connected to your tow vehicle then I would start off by checking your 7-Way connectors for any corrosion or debris. If those look good the next step would be to determine if the brake controller signal is actually getting to the trailer or not. Using a circuit tester like part # PTW2991 test the pin in the 5 o'clock position...
    view full answer...
  • 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.
    view full answer...
  • Wiring Connections for Hopkins Endurance on a 1997 Dodge Ram 2500
    According to my research the wiring for your 1997 Dodge Ram 2500 are for the following functions: Black/orange - Tail/Running Red/Tan - 12V Power Green/Red - Left Turn/Stop Brown/Pink - Right Turn/Stop Light Blue - Trailer Brake Purple/Black - Reverse Black - Ground This means that if you are installing the Hopkins Endurance Quick-Install # HM47210 you will want to connect the wiring from your Dodge Ram to the following wires on the Hopkins Endurance: Black/orange - Brown Red/Tan...
    view full answer...
  • With Trailer Connected Truck Reverse Lights and Trailer Brake Lights Are Not Working
    It sounds like you might have a few different issues going on here. First, we need to test the vehicle side 7-Way connector to make sure it is working properly. Use a circuit tester such as # PTW2991 to test the pins on the connector while someone sits in the truck and runs through the light functions. If something does not work then you will need to determine the problem. Check the trailer connector for corrosion inside and out. Corrosion can cause all sorts of issues, so can ground...
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  • How Does the Hopkins Agility Trailer Brake Controller Install on a 2003 Western Alpine RV
    The Hopkins Agility brake controller # HM47294 does come with a harness so that you can hardwire it into a vehicle. If your 2003 Western Alpine was built on the Ford F-53 chassis by any chance, there may be a plug in harness available that would make installation easy. If it is the F-53 chassis, there is a brake controller plug located behind the instrument cluster. It is difficult to get to though. Take a look at the picture showing where it is. You would use harness # HM47855 to plug...
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  • Brake Controller Error Message with 2012 Dodge 2500 4x4 Towing 2002 4-Star Horse Trailer
    The problem you describe of your brake controller displaying an error message when your tow vehicle lights are turned on suggests several possible causes. One potential cause is damage/corrosion in the trailer connector(s) that could be causing two separate circuits to be bridged. It can happen that corrosion in a connector can actually create an electrical connection between two adjacent circuits, in this case the brake circuit and the running light circuit. Another possibility is that...
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  • Trailer Brakes Intermittently Turn On While Driving without Using Brake Pedal or Manual Override
    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...
    view full answer...
  • Troubleshooting Trailer Wiring for Fleetwood Pop-Up Trailer and 2003 Mazda B3000 Pickup
    A potential cause for your issue is a weak ground connection. Trace the white ground wire from your 4-pole back to where it attaches to the vehicle frame. This ground must be secured to a clean and rust-free spot on the frame. If necessary sand off the rust/dirt from that grounding point and reattach the white ground wire or relocate it a new spot. If this does not correct the problem then I suggest you next test your existing 4-pole trailer connector on your Mazda to confirm it is...
    view full answer...
  • Trailer Brakes Will Not Lock Up with Primus IQ Brake Controller # TK90160 in 2007 Silverado 1500
    The fact that your trailer brakes will not lock up at 20-25 mph speed does not necessarily indicate a problem with the brake controller. The best way to isolate the problem is to apply a circuit tester to the wires leading into one of the trailer electric brake assemblies to read the voltage reaching the brake. You can use a voltage tester like # BTMT15 to read the voltage being delivered to the brake assembly. You should read +12 volts or very close to it at each brake when the controller...
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  • Troubleshooting Draw-Tite Activator II Brake Controller
    The troubleshooting guide for the (discontinued) Draw-Tite Activator II 5500 is actually the same as the Draw-Tite Activator IV # 5504. The instructions (with the troubleshooting guide) for the Activator IV are linked for you to reference but I have also clipped the guide for the Activator II that you can check out. I'm pretty sure the So code you are talking about is either the Sync display meaning that the Sync Control has been moved or the 2.0 display meaning that you are having...
    view full answer...

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Info for this part was:

Video Edited:
Dustin K
Installed by:
Cole B
Installed by:
Brent H
Written by:
Mary E
Video by:
Zach D
Updated by:
Erin H

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