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Replacement Tekonsha Trailer Breakaway Switch

Replacement Tekonsha Trailer Breakaway Switch

Item # 420000
Our Price: $13.69
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Shipping Weight: 0.47 lbs
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  • Reviews (60)
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Tekonsha Accessories and Parts - 420000

  • Trailer Breakaway Kit
  • Switches
  • Tekonsha


  • Application: up to 4-axle trailer brake systems

2010-B125 Tekonsha Replacement Breakaway Switch for Kit 2010-P

California residents: click here

Video of Replacement Tekonsha Trailer Breakaway Switch

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

Video Transcript for Tekonsha Trailer Breakaway Kit 420000 Review

Today, we're going to be taking a look at the Tekonsha Replacement Breakaway Switch. Now, a breakaway switch is designed to apply power to the trailer brakes, to stop the trailer should it become disconnected from the tow vehicle. If the trailer and vehicle disconnect, the vehicle pulls on this cable right here, which pulls the pin out of the switch. Once this happens, the trailer brakes are applied, which will bring the trailer to an eventual stop. The kit is going to come with the switch. It's going to come with the wiring. It's going to come with the pin.

It's already installed there, and it's going to come with the cable. It's already attached. The wire leads on this side, these are going to measure 48 inches, or 4 feet long. One wire gets connected to power, the other wire gets connected to the electric trailer brakes. On this side, we're going to have the cable.

This is a high-strength, steel cable that's covered with a protective coating to keep it from fraying and to keep it from scratching anything that it comes into contact with. Now, this unit is designed for 1 to 4 axle trailer brake systems. The cable length is going to measure 48 inches or 4 feet long. It's got the looped end on here, that would connect to the tow vehicle. When it comes to the dimensions of the switch, it's really nice, low-profile design. This is going to give us an overall length measurement, and I am including the bracket.

From edge to edge, we're looking at about 4 7/8 inch long, and that's measuring from the end of the bracket to the end of the pin. The switch body, that's going to give us a measurement of about 3 inches long. The overall width, you can see that the switch kind of hangs out over the side a little bit, so the overall width is right around 1 7/8 inch. Just that bracket width is going to be about 1 1/2 inch. Then, the height, or the thickness, it's only about 7/8 of an inch. It does have a mount hole right here.

That's going to give us a diameter of 1/4 of an inch, and hardware is not included to get that mounted to the trailer frame. That's going to do it for today's look at the Tekonsha Replacement Breakaway Switch.

Customer Satisfaction Score:

Customer Reviews

Replacement Tekonsha Trailer Breakaway Switch - 420000

Average Customer Rating:  4.8 out of 5 stars   (60 Customer Reviews)


This allowed me to back up my camper easier because it move the distance from hitch to wheels just enough. Very very strong.


Put the axle seals in the same box as 40 hooks and bent a few of them a bit

Etrailer Expert

Jenny N.


Oh no! I will have our Customer Service team reach out to you.


Helped make it easier to back up traile r.


Purchased this switch to replace old rusty unit on our cargo trailer. I checked function with volt meter prior to installation and it works as advertised. Quality seems to be very good. It's one of those things you have to have but hope it never gets any opportunities to perform! Good customer service and prompt delivery. No problems.

Ken R.


No problems. Unit is holding up well and dont foresee any problems.


etrailer products and service are excellent! With their helpful videos and staff (plus a little help from Curt Manufacturing and our teardrop trailer manufacturer (CampInn)) I was able to install electric brakes on the trailer, and a controller in my vehicle by myself. I had never installed electric brakes before. Everything works perfectly!


Good product, simple and works. Used this to replace the original brake switch due to it breaking. Wired to a small 12V breakaway battery then to Blue brake wire on the car trailer and all works as it should.


easy as falling off a log to install to replace my old one



despite my best effort it is still working. it constantly exposed to road dirt, rain and heat


Always have what I’m looking for and great prices


Right parts at a great price !!!


Ordered battery box and break away switch. Received item in a timely matter and was a good quality for the price. Happy with E-trailer co. will order from them as needs arise.


Quality part good service


This item was exactly what I needed. The etrailer site was so easy to navigate and the selection of items cannot be beat. Whether you are looking for a component or a complete kit, they seem to have it all.


Easy install


Great replacement breakaway switch.


This is an exact replacement for the oem on my trailer. Won't install until spring, but I expect it will work fine. Received product very quickly and in good shape.


Bought for an exact replacement of existing switch which the contacts rusted out on. worked perfectly!


Purchased a second hand RV that had a damaged switch and ordered an exact replacement from etrailer that works great.


This is a geeat safety feature and eTeailer has excellent customer service and is our go-to place for anything for our trailer


Got it in the mail faster than the estimated shipping! Easy install. This website has a lot of videos of installations which are helpful.


Products i bought was good quality and etrailer ships out quickly. I like buying from company that is quick


Products I received were easy to install. I followed the instruction videos on your web site which were very helpful. I am very satisfied with your service.


Happy with service and all the parts I buy..


Quality product and fast order processing by etrailer. Thanks guys, I will be checking with you for all my future needs.


Etrailer was great to work with. They had the product that I needed and was received the next business day. Quality product at a good price. I will absolutely use them again.


Great service, reliability, and respons iveness.

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See what our Experts say about this Tekonsha Accessories and Parts

  • Replacement Breakaway Switch Recommendation for UPG D2901 Solution
    I wish we carried that but we do not. One solution we can provide is to replace the entire switch with part # 420000. This will be the easiest solution and will work well as the switches are universal.
    view full answer...
  • Troubleshooting Trailer Electric Brakes and Breakaway Kit Installation
    If you just put new brake assemblies on your dump trailer, the brake magnets have two wires and it doesn't matter which one gets the brake controller output voltage and which one is grounded to your trailer. You do want to make sure the one grounded to your trailer has a bare metal to metal connection free of rust, corrosion, or debris. If you have also added a breakaway system like the Replacement Tekonsha Trailer Breakaway Switch # 420000 you asked from, then you will want to install...
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  • Troubleshooting Breakaway Switch To See If it is Reason System Isn't Working
    If you cut the wiring of the switch and bypassed it like you mentioned and could hear the brakes hum that would mean that the switch is the issue that's preventing the system from working properly. Based on what you mentioned already it does sound like this is the most likely cause. In that case a replacement switch like the part # 420000 would be what you'd need.
    view full answer...
  • Is a Circuit Breaker Required When Installing Trailer Breakaway Switch?
    When installing a breakaway system and the Replacement Tekonsha Trailer Breakaway Switch # 420000 you asked about, there is no need to add a circuit breaker or in-line fuse. I've attached a help article for the installation of a system as well as a video of an installation to assist.
    view full answer...
  • Bedroom Circuit Breaker and Main Breaker Trip on a 1998 Four Winds Travel Trailer
    It sounds like a possible short caused by a damaged or corroded wire. This would cause an overdraw and trip the circuit breakers. You would have to examine the wire in question and look for pinched areas or frayed and exposed copper strands. I do not have access to a wiring schematic for the trailer. Your best option for that would be the trailer manufacturer.
    view full answer...
  • Solution for Lost Plunger for Esco Model 2010 Breakaway Switch
    The easiest solution I can provide is to just replace the entire switch with the part # 420000 that you referenced. Trying to replace just the plunger can be challenging and since all of the switches are basically universal it's just easier to replace the whole thing.
    view full answer...
  • Can the Pin On a Tekonsha Breakaway Switch Be Removed To Replace Steel Wire
    Yes, the pin can be pulled off and you can then replace the wire. Make sure that everything is disconnected so you do not accidentally set the breakaway kit off.
    view full answer...
  • Replacing Breakaway Switch On a Trailer with ESCO Breakaway System
    You likely can use any replacement switch since all they do is complete a circuit when the pin is pulled out. One wire on the switch should be connected to the positive battery terminal on the trailer. The other will tee into the wiring leading from the trailer connector to the brake magnets like in the diagram I have included. Just follow the wires on the old switch to where they are connected and remove them. I have also included a link to the right that should help.
    view full answer...
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  • Breakaway Switch Diagram for Installation on a Dump Trailer with Trailer Mounted 12 volt Battery
    I attached a diagram showing how a breakaway switch, like part # 420000, would be wired to a trailer mounted battery like the one on your Loudo dump trailer. With this type of setup you would not want to pull the breakaway switch with the trailer connected to the vehicle, to avoid a short circuit situation which could damage your brake controller. When testing the breakaway switch just be sure to disconnect the trailer connector from the truck, as it would be in a breakaway situation. The...
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  • Can Replacement Breakaway Switch # 420000 Be Used with Any Breakaway System
    For the most part, all breakaway situations work the same way. There are a few exceptions but they are not common. If your existing system used 2 wires like # 420000 then you can use it or any similar switch. I have included a link to all of the breakaway switches we carry.
    view full answer...
  • Wiring a Replacement Breakaway Switch
    I can help you wire the Replacement Tekonsha Trailer Breakaway Switch # 420000 and the accompanying diagram shows exactly how it will be wired; I have also added a link to a video which shows it being installed. The white wire is a ground wire and the other two wires are interchangeable. One will be spliced from the from the switch and blue trailer brake wire that is running from the trailer connector to the trailer brakes. The other wire will be spliced to the blue brake wire coming...
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  • Should a Rusted Trailer Breakaway Switch be Replaced
    The pin that keeps the contacts inside a break away switch is plastic or otherwise a material that does not conduct electricity. As long as the contacts on the inside are not rusted the switch will continue to work. There is a way you can test it and I have linked an FAQ that shows how. Given that rust spreads it sounds like it would be a good idea to replace the switch. You can use any switch, like # 420000, that you have referenced. If the wiring to and from the switch is removed then...
    view full answer...
  • Identifying a Trailer Breakaway Switch with ESCO Printed on the Switch
    ESCO actually stands for Elkhart Supply Corporation, that is the brand of your breakaway switch. Most likely it is part number LBS48-16. If you are looking for a replacement switch the Hopkins Replacement Break-Away Switch # HM20014 should work well for you. I attached a couple FAQ articles on breakaway switches for you to check out as well.
    view full answer...
  • How Does Replacement Breakaway Switch Wire into Circuit
    I don't have a specific way to recommend wiring the part # 420000 to a dump trailer but essentially this switch wires into a circuit by just cutting the wire and splicing it between the two wire ends. Whenever the plug of the switch is inserted the circuit is dead and then when the pin is removed the circuit is active. I attached an install video for you to check out as well.
    view full answer...
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  • Troubleshooting Brake Controller that Only Works with Override Lever
    Sounds like your brake controller will apply your trailer brakes if you apply the manual override lever but not when you press the brake pedal. This is a fairly common problem and the solution is the red wire of the brake controller. Make sure it is connected to a circuit that only sees voltage when the brakes are applied and none when released. Most likely the connection is the issue and just reconnecting the circuit will cause the controller to work again.
    view full answer...
  • What Does a Trailer Breakaway Kit Do
    Yes, what you described is the correct purpose of a trailer breakaway braking system. If for some reason the hitch and the safety chains were to fail and the trailer was to be completely unattached from the tow vehicle the breakaway kit would activate the trailer brakes so that it would stop as soon as possible. You would want to ensure that the length of the cable is enough so that under normal situations the pin would not get pulled while the trailer is still safely connected to the...
    view full answer...
  • Troubleshooting Wiring Issue of Trailer Breakaway System
    Most likely the problem is not insufficient amperage if the fully charged breakaway battery won't apply the brakes. You can test this however by running a jumper wire from a car battery to see if the much higher amperage of that battery does the job. I would be very surprised if the problem wasn't the wiring. Electric stuff can be frustrating to diagnose, but if you go over all of the connections and compare the setup to the diagram I attached you should be able to find the problem.
    view full answer...
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  • Are There DOT Regulations on the Pull Pin Lanyard of a Breakaway System
    That we or Tekonsha are aware of there aren't any restrictions on the cable used on breakaway system. Typically in towing situations the restrictions aren't that specific. They will say you need a breakaway system that functions, but they won't get down into the materials used of the system in question. For more information on breakaway systems check out the link I attached.
    view full answer...
  • Breakaway Battery Causes Trailer Breaker to Pop When Connected Troubleshooting
    Sounds like you have at least a few wiring problems going on with your setup. Instead of trying to troubleshoot each issue you have I think it would be smart for you to inspect all of the trailer wiring you have starting with the 12 volt circuit from your tow vehicle to the battery and breakaway system to see if you can find any shorts or exposed wire and fix as necessary. I attached a diagram and an FAQ on breakaway systems for you to check out. I also attached an FAQ on trailer wiring...
    view full answer...
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  • Troubleshooting New Breakaway System Not Working Properly
    If your newly installed breakaway kit, such as the Hopkins Engager Breakaway Kit w/ Built-In Charger # 20099, is not working properly there are a number of issues you will want to take a look at. The first thing you need to do is make sure the breakaway battery is fully charged; if you tested it without a fully charged battery that would be the reason why it wasn't functioning. Another issue is that your brakes may need to be adjusted; if they were not properly adjusted when you tested...
    view full answer...
  • Solution for Trailer Breakaway Pin that is Broke and Won't Stay Installed
    The easiest solution for a breakaway pin that keeps popping out would be to replace the entire switch since they are all universal and the install is really easy. For that the # 420000 would be a great solution that will wire right in place of what you have.
    view full answer...
  • Wiring a Trailer Breakaway Kit on a Bigfoot Travel Trailer
    In order for a break away system to power electric trailer brakes, it will need a 12 volt power source (a battery mounted on the trailer). The battery has to provide a full 15 minutes of braking power to comply with DOT regulations. On the trailer connector there is a wire that goes back to the trailer brakes. This wire may be black or blue depending on the specific system. Attach one wire from the switch to the wire that goes to the trailer brakes. There should be another wire, usually...
    view full answer...
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  • Should Breakaway Switch Activate Brake Magnets When Pin Is Pulled
    Yes, the brake magnets should engage when pulling a properly wired breakaway switch pin. If the brakes aren't locking up on your trailer when pulling the pin then I recommend making sure the power source (battery) for the switch is fully charged and that everything is properly connected. When testing the switch I don't recommend having the trailer hooked up to the tow vehicle just so you can avoid any potential damage to the brake controller or wiring on the vehicle. I have attached a...
    view full answer...
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  • Installation Instructions for the Tekonsha Breakaway Kit with Charger # 20020
    Check out the link I attached that has the installation instructions for the Tekonsha Breakaway Kit with Charger # 20020 that you referenced. Scroll down to the section on wiring a Tekonsha breakaway kit to see what it would take to install this kit on your trailer.
    view full answer...

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