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Circuit Tester Kit

Circuit Tester Kit

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Electrical Tools 40376 - Circuit Tester - Draw-Tite
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  • All Info
  • Reviews (23)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

Draw-Tite Electrical Tools

  • Testers
  • Circuit Tester
  • Draw-Tite

Circuit Tester Kit


Features:

  • Heavy-duty tester signals with a light and a buzzer
  • Tests low voltage up to 28 volts
  • Finds electrical shorts
  • Checks circuits from a distance
  • Checks polarity
  • Checks battery drain
  • Kit includes:
    • Alligator clip
    • Hook


40376 Circuit Tester Kit

Item # 40376




California residents: click here


Video of Circuit Tester Kit

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




Video Transcript for Circuit Testing a Vehicle 4-Pole

Today Im going to show you how to test the functionality of a trailer four-way connectors. What youre going to need to do this is a circuit tester and a buddy in the drivers seat to operate the taillight functions. The first thing were going to test is the taillights themselves. Hit the taillights. (beeping) that means thats working. The next thing were going to test is the left blinker.

(beeping) That works. Then were going to test the brake light function on that side as well. So, hit the brakes. (beeping) That works. Then for the right blinker (beeping).

Now the right brake (beeping). Now we know that this four-way connector is functioning.


Customer Reviews

Circuit Tester Kit - 40376

Average Customer Rating:  5.0 out of 5 stars   (23 Customer Reviews)

Circuit Tester Kit

- 40376
by:

Works as described, no issues. Would definitely purchase again.



- 40376
by:

Off cause Etrailer is the best ! Never regrets order things from them!



- 40376
by:

This is my second Lisle circuit tester. I purchased to replace a unit I lost. These are very well made and worth the extra spend. The Customer Service from e-trailer is second to none and I'm a repeat customer due to the help these folks will render.


Comments
Still works well and is still in great shape. Thanks for asking.
Scott P - 09/29/2016



- 40376
by:

Ordered several electrical connectors,wire and a wire tester .. all items came in good condition ,looking forward to using the tester as soon as I can I am sure it will do the job.



- 40376
by:

Excellent service and attention to detail. I would highly recommend purchasing from etrailer. Prices are great and they have a wide selection of information that helps with the purchase decision. Very impressed.



- 40376
by:

Seems expensive for what it does but sometime these one-function devices can save you a lot of money. This is my case. My 2003 GMC Sierra doesn't fall into any category on this website -- at least I couldn't find any good info -- it's somewhere between 2002 and 2004 as far as towing package is concerned. This device allowed me to figure it all out.



- 40376
by:

This really is the ultimate circuit tester! The audible feature is a huge benefit when working alone and energizing a circuit remotely.... saved me multiple trips between truck cab and trailer tail lights! When working on trailer light circuits, this is a must have tool!



- 40376
by:

I have placed several orders with e-trailer over time and keep returning. I have gotten ffast response on questions and all orders have been filled correctly an on time.



- 40376
by:

Purchased this to troubleshoot existing truck wiring and wiring I installed. Much more convenient than using my volt-ohm meter (VOM).



- 40376
by:

This circuit tester was worth every penny. The audio and light indicators took all the guesswork out of the wiring. It made it easy to identify turn signal and brake wires and I was able to test for proper functionality in my trailer contact once everything was installed. Highly recommended.



- 40376
by:

Well made, clear instructions and very useful for sorting out trailer wires. If you have several trailers and multiple towing vehicles this is real handy!



- 40376
by:

Easy to use voltage indicator. Flashes and beeps so you hear and see . Made the job so much easier. The coiled cord is really long and makes it very convenient.



- 40376
by:

Excellent quality circuit tester. Can check battery drainage and troubleshoot wiring shorts.



- 40376
by:

worked great for the purpose check wiring on trailer



- 40376
by:

High quality equipment! Thanks etrailer.com for the excellent service.



- 40376
by:

This tester is well made and definitely worth the money. Makes troubleshooting wiring problems a breeze.



- 40376
by:

Very nice tester. Heavier duty than the cheap ones you buy at local retail stores. I like the fact that it also has the audible tone along with the light.



- 40376
by:

Product were just explained. always a great job. i enjoy doing business with etrailer.



- 40376
by:

Great product


Comments
Great product
Kej263 - 05/04/2018



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- 40376
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- 40376
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Looks good



- 40376
by:

Great tester


23
23

Ask the Experts about this Draw-Tite Electrical Tools



  • P3 Brake Controller in 2009 Chevy Suburban Suddenly Stopped Recognizing Trailer
    It is very possible that the brake magnets or the wiring to them are the problem. If the magnet wires are getting 12-13 volts on their power wires then make sure the ground wires are attached to clean and corrosion free bare metal surfaces. Inspect the magnets as well and if you can see the copper windings coming through then they will need to be replaced. I have included a help article on how you can further test brake magnets. If the trailer has a break away system then you will need...
    view full answer...
  • Brake Controller Works with Manual Override but Not Brake Pedal on a 2005 Ford F-150
    When a brake controller is working fine with the manual override but not with the brake pedal that indicates a problem on the red wire. The red wire is the input wire telling the brake controller you are stepping on the brake pedal. Check the connection on the red wire, make sure that it is not damaged or loose. If you have the brake controller plugged into the factory connector then make sure that the end that plugs into the truck looks like the picture I have included. It could also...
    view full answer...
    Image 1 for
  • Fixing Lights on a Utility Trailer
    The first thing to do is determine whether the problem is on the tow vehicle or the trailer. You can do this by using a circuit tester, like part # 40376, on the trailer connector and testing the pin for the running lights while the headlights are on. If you get current on that circuit, then the problem exists on the trailer. You will have to trace the running light circuit usually the brown wire from the connector back to the lamps, looking for pinched or broken wires, and loose or missing...
    view full answer...
  • Locating Stop Light Circuit Wire for Brake Controller Install on a 1999 GMC Yukon
    The easiest way to do this is to access the main vehicle wiring harness located under the dash near the steering column. Using a circuit tester like part # 40376, you would probe the wires in this harness until you find the one that only shows current when the brake pedal is pressed. Once you find the right wire, you can tap the red wire from the brake controller into it.
    view full answer...
  • Finding the Reverse Light Wire on a 1995 Ford F-150 for Installing a 7-Way
    Without a tow package, there probably will not be a harness or wire bundle that you can tap into. Your best bet would be to tap into the wiring behind one of your back up lights. Use a circuit tester, like part # 40376, to verify this connection. It sounds as if you have the rest all figured out. Good job!
    view full answer...
  • Trailer Signal and Brake Lights Not Working on a Trailer Behind a 2007 Nissan Titan
    The first thing I would recommend you do is use a circuit tester, like part # 40376, and check your trailer connector on the bumper of your truck. Activate the turn signals and check the appropriate pins for a signal. Then have a helper step on the brake pedal and test for a signal at the 2 pins for the left and right turn signal. If you do not show a signal for any of these functions, you probably have a blown fuse. Consult the vehicle owner manual for the location of the fuses that...
    view full answer...
    Image 1 for
  • Find the Cold Side Wire for a Brake Light Switch on a 2001 Chevrolet Blazer S-10
    The switch itself is located at the top of the brake pedal. If you cannot access the wires coming off of it, you can access them through the main wiring harness, located under the steering wheel. You will be looking for the thick bundle of wires. Using a circuit tester, like part # 40376, locate the wire that only shows current when the brake pedal is pressed.
    view full answer...
  • Brake and Turn Signals Not Working on a Trailer Behind a 2005 Jeep Grand Cherokee
    I would recommend you use a circuit tester, like part # 40376, and test the pins on the 4 pole while each function is activated. This will narrow down the problem to the vehicle or the trailer. If it works properly, then the problem is on the trailer and vice versa. Closely examine the pins and sockets on each side of the vehicle/ trailer connection, look for any corrosion, which will show up as a green discoloration. Many times, this corrosion will be enough to prevent a proper connection....
    view full answer...
  • Which Wire is the Stop Light Wire on a 2007 Dodge Sprinter
    Due to the varying wire colors between manufacturers and model years, I do not have any information on the specific wire color. The wire you need to tap into will attach to the cold side of the brake switch. The brake switch is located at the top of the brake pedal. We recommend using a circuit tester, like part # 40376, to probe the wires coming off of the brake switch until one is found that only shows current when the brake is pressed. This will be the wire you need to tap the red brake...
    view full answer...
  • Hardwiring a Brake Controller on a 2005 Ford F-250
    At this point, the easiest thing to do would be to install the brake controller as if the vehicle was not wired. The four leads coming off the brake controller are wired as follows: The red wire would tap into the wire coming off the cold side of the brake switch located above the brake pedal. The easiest way to locate this wire is to use a circuit tester, like part # 40376, and locate the wire that only shows current when the brake pedal is pressed. The black wire would run to a 12...
    view full answer...
  • Brake Controller Shorts Out and Smokes When Brakes are Applied on a 1995 Dodge Van 2500
    It sounds like there is a direct short circuit somewhere in the system. Closely check all the wiring connections. The red wire on the controller should be connected to the cold side wire on the brake switch (the wire that shows voltage only when the brake is pressed.) I believe it is usually a white wire with a tan stripe. I would recommend using a circuit tester, like part # 40376, to verify this connection. Closely examine the blue brake output wire that exits the rear of the controller,...
    view full answer...
  • Brake Controller Causes Trailer Brakes to Lock Up and Not Release
    I would start by examining your trailer brakes. If the shoes or springs are very worn, and are out of adjustment, they could be causing the brake assembly to hang up, or stick. You can use a circuit tester, like part # 40376, on the blue wire exiting the rear of the brake controller, and check for voltage when the brake override switch is activated. If the voltage disappears immediately once the switch is released, you'll know that it is the brakes hanging up, and not the brake controller...
    view full answer...
  • Brake Light Switch Wire for Installing a Brake Controller on a 1998 GMC Sierra
    The wire in question is located in the large wiring harness under the dash near the steering column. Since the wire colors are not consistent from year to year (or sometimes even within the same model year) you will have to use a circuit tester, like part # 40376, and probe the wires until you find one that will only show current when the brake pedal is pressed.
    view full answer...
  • Brake Controller Not Getting a Stop Light Signal from 2005 GMC Sierra
    The first thing I would do is check all your fuses. I believe that circuit is shared with the third brake light. The cold side wire is located under the dash in the large wiring harness by the steering column. It is typically a white wire (although color varies from year to year). The wire can be difficult to locate. You will need to use a circuit tester, like part # 40376, and probe wires until you find one that only shows current when the brake pedal is pressed. The wire should be light...
    view full answer...
  • Trailer Running Lights Not Working Behind a 2003 GMC Sierra
    The first thing to do is check the underhood power distribution box. This box contains the fuses that manage your towing circuits. Please refer to your vehicle owner manual for individual fuse location. If the fuses are OK, then you will have to narrow down the problem to the trailer or the tow vehicle. Use a circuit tester, like part # 40376, and check each pin on your trailer connector while the corresponding function is activated. When you test the pin that connects to the brown trailer...
    view full answer...
  • With Draw-Tite Activator Vehicle Brake Lights Stay on When Vehicle is Off on 1999 Ford F-250
    I can suggest a few things to check. You are getting feedback into the vehicle wiring system somehow. Closely examine your trailer connector, both the trailer and the vehicle side. Make sure there is no corrosion. If there is a small amount on the pins, there might be much more inside the connnector itself. Also, check the blue brake output wire that exits the rear of the brake controller. Using a circuit tester, like part # 40376, make sure you are getting around 12v when the brake override...
    view full answer...
  • Running Lights Do Not Work on Trailer Behind My 2008 Chevy Equinox
    I would first use a circuit tester, like part # 40376, and check the trailer connector on the back of your Equinox. Make sure you are getting voltage at each pin when that function is activated. The pin that the green wire attaches to should show current when the right turn signal is activated. The pin for the yellow wire should show voltage when the left turn is activated. The pin for the brown wire is for the tail/ running lights. You should be seeing current here when these are activated....
    view full answer...
  • Brake Controller Causing Trailer Brakes to Sometimes Lock up Behind a 2003 Chevy 2500HD
    My suspicion is that the problem exists on the Chevy somewhere, because the problem does not occur when towed with another vehicle. I would first check the brake controller. Using a circuit tester, like part # 40376, make sure you have 12 v going into the brake controller, and check for output when the manual override is activated. Also test at the trailer connector for current while the override is activated.
    view full answer...
  • Trailer Tail Lights Come On when Brakes are Not Used with a 2004 Ford Windstar
    The problems might be related. I would first replace that burned out bulb, and if the problem is not fixed, use a circuit tester, like part # 40376, and check each pin on your connector while that function is activated. (For example, pin for yellow wire-left turn signal, pin for green wire-right turn signal, pin for brown wire-running lights.) You might also use that tester and check your converter to make sure it's working as it should. Make sure there is signal going in one side of the...
    view full answer...
  • Trailer Light Comes On when All Other Lights are Off with a 2003 Chevy Silverado
    I would recommend you use a circuit tester, like part # 40376 to check the functions on your 7 way connector. Check each pin as its function is activated. If that checks out you might have a weak ground connection on the vehicle or the trailer side. There should be a secure ground connection to clean metal on both the trailer and the vehicle side of the connector.
    view full answer...
  • Identifying Wires for Brake Controller Wiring on a 2007 Chevy Silverado
    You have 3 of the 5 correctly identified. Use a circuit tester, like part # 40376 to verify, but the orange wire is for the stop light switch. This wire should show current only when the brake is applied. The last wire is for an illumination circuit, and is not used. Just cap it off.
    view full answer...
  • Brake Controller Only Working when Using the Manual Override
    First thing I would do is use a circuit tester, like part # 40376, to check the red wire coming out of the rear of the controller to make sure you get voltage when the brake is pressed. If not, you might have a blown fuse in the power distribution box under the hood. The brake controller gets its input from the CHMSL circuit, which is the third brake light on the rear of the cab. If this light is not functioning as well, the fuse is the problem. Your owners manual should be able to tell...
    view full answer...
  • Brake Controller Stopped Working on a 2008 Chevy Silverado
    The fuses that manage your towing system are located under the hood of your truck. Please consult your vehicle owner manual for the exact location of the fuses. Are you getting output from your controller itself? Using a circuit tester, like part # 40376, I would check the pin for the brake wire on the 7 way connector when the manual override switch is activated. If you see no voltage there, check the blue wire as it exits the back of the controller, again with the override activated....
    view full answer...
  • Wiring a Trailer Connector for a 2004 Renault Laguna Sport Tourer
    I am unfamiliar with the vehicle you are speaking of, but I can give you some general advice. Whether or not you are using a converter, you will want to use a circuit tester, like part # 40376, to locate the appropriate wires to gain access to the lighting circuits. You do not mention which connector you are wanting to install, but I will assume it is a 4 pole. You will need to use a process of elimination to locate the correct wires. Activate the left turn signal, and then test the wires...
    view full answer...


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