Trailer Breakaway Kit

/

Hopkins

/

Kit with Charger

/

Top Load

Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load

Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load

Item # 20400

lowest price pledge

Retail:$79.47

Our Price: $45.95

You Save: 42%
Trailer Breakaway Kit

Orders above $50 qualify for Free Shipping

Shipping Weight: 4 lbs

Arrives before Christmas with Ground or Free Shipping.
Quantity: 
In Stock, Ships Today
20400 - Top Load Hopkins Kit with Charger
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
Please enter a valid email address.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

pop out icon replay 360 icon
horizontal rotate icon

Product Images

In Use/Installed

Customer Photos

Breakaway system with built-in charger is designed to bring a trailer safely to a stop by activating its electric brakes should it become disconnected while being towed. Push-button tester lets you know if the rechargeable battery is fully charged. Lowest Prices for the best trailer breakaway kit from Hopkins. Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load part number 20400 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (324)
  • Q & A (60)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Trailer Breakaway Kit - 20400

  • Kit with Charger
  • Hopkins
  • Top Load

Breakaway system with built-in charger is designed to bring a trailer safely to a stop by activating its electric brakes should it become disconnected while being towed. Push-button tester lets you know if the rechargeable battery is fully charged.


Features:

  • Breakaway system activates your trailer's electric brakes if the trailer disconnects from the tow vehicle
  • Push-to-test battery feature offers fast and easy battery testing
    • Test button with LED lights clearly displays battery status
      • Green = charged
      • Yellow = charging
      • Red = low battery
  • Built-in charger automatically refuels battery while trailer is connected to tow vehicle
    • Charges at 1/2 volt below voltage supplied by tow vehicle to prevent over-charging
    • Shut-off feature activates when battery is fully charged
  • Top-loading case is easy to access from above
    • Weather-resistant construction protects battery from moisture and debris
    • Self-tapping screws included for simple mounting on your trailer's frame
  • Lockable lid deters theft (padlock sold separately)
  • Breakaway switch installs on your trailer's frame - drilling is required
  • Department of Transportation (DOT) compliant
  • 12-Volt rechargeable battery is included


Specs:

  • Application: single- and tandem-axle trailers with electric brakes
  • Case dimensions: 4" long x 8" wide x 6-1/4" tall
  • Battery capacity: 5 amp-hours
  • Mounting hole spacing:
    • 7" From center of hole to center of hole horizontally
    • 1-1/2" From center of hole to center of hole vertically
  • 16-Gauge wires
  • 90-Day warranty


Note: A breakaway system is required by law in most states for trailers that are equipped with electric brakes and have a GTW of at least 3,000 lbs.



20400 Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Charger - Top Load - 5 amp/hrs



20400 Installation InstructionsInstallation Details 20400 Installation instructions


California residents: click here


Video of Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load


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




Video Transcript for Hopkins Engager Trailer BreakAway Kit Installation

Today on our trailer, we'll be installing the Hopkins Engager Trailer Breakaway Kit with Charger and Tester, part number 20400. Breakaway switches and kits are installed for emergency breakaways from the towed vehicle. It will pull the pin and gauge the battery, sending power to the trailer breaking, automatically applying the breaks to your trailer. Here, we have the new Engager Breakaway System with charger and battery. We have the pre-installed wires, our ground, power, and break-V. Built into the case, our attachment points on both sides.

Once we have it in place, we can go ahead and use some self-tapping screws to secure it. Now with our box mounted, we'll go ahead and mount the new switch. The black wire will run to the vehicle battery which was the red wire from our pigtail. Added to that, we'll have the black wire from our breakaway switch. Next, we'll go ahead and hook up the ground circuit. That will be the white wire from our breakaway box and the white wire that's pre-attached to our pigtail.

Then, our last connection will be the blue wire from our breakaway box will connect to the blue wire from the breakaway switch and the black wire from our trailer pigtail. We're going to be using the Deka Yellow Heat-Shrink Butt Connector for 12 to 10-Gauge Wiring, part number DW05745-5, and the Deka Blue Heat-Shrink Butt Connector for 16 to 14-Gauge Wiring, part number DW05744-5. We'll need to heat up the shrinkage portion of the butt connector. Using our heat gun, we'll go ahead and do that now. Note, if you don't have a heat gun, you could also use a lighter or a butane torch. Just keep in mind to keep your heat source moving, so that you don't actually melt the wire.

We'll now go in and put the breakaway switch pin into the breakaway switch. Now with everything connected, we'll go ahead and finish securing our wiring. We'll put the remaining portion of the wire back into the wire loom. At the end, install our digression. I'm going to go ahead and use some black electrical tape just to wrap up my wiring. I'll bundle it up and clean up the install look.

Next, we'll go through operation of our new breakaway system. We can press the green test button to check the battery voltage. You can see it indicated it's recharged, so as our trailer is being towed, the hot lead from the 7-pole connector that connects to the vehicle will supply power to our battery charger, recharging the internal battery. That will complete our install of the Hopkins Engager Trailer Breakaway Kit with Charger and Tester, part number 20400. .


Customer Reviews

Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load - 20400

Average Customer Rating:  4.8 out of 5 stars   (324 Customer Reviews)

Breakaway system with built-in charger is designed to bring a trailer safely to a stop by activating its electric brakes should it become disconnected while being towed. Push-button tester lets you know if the rechargeable battery is fully charged.

- 20400
by:

Since I was rewiring the trailer anyway, I decided to install the breakaway as an upgrade. I received the part in good shape and it appears to fill the bill. I mounted the switch in the front of the V of the hitch where there is a flat surface. I drilled a 3/4" hole to allow the pin to be inserted without being subjected to damage. The mounting surface used was a plate along side of the jack lift. By mounting it against the backside of the front plate through the hole, the switch is held in place and totally protected. I mounted the battery in the upper part of the storage compartment in the front of the trailer and used a terminal strip to connect it to the other wiring as needed. I connected the interior LED lights through a switch to this battery to provide lighting inside the trailer. Pretty cool. When the vehicle is connected to the trailer, the battery is charged. If the pin is pulled out of the breakaway switch, the power from the battery is applied to the brakes. The battery is quite small something like 4 amp hours, but that is great plenty to operate the brakes in any emergency situation for several minutes because the brakes have a small draw. The only problem I had with the battery was that it lays in the package without constraints so that it can flop around. It had yanked the white wire loose from the battery so the system did not operate until I realized that it was disconnected. So I reconnected it and put it back together, but the wire disconnected again. The wires pass through a slot in the box and are also not constrained so that they are pulled out by operating the cover door. I just taped the wires together with electricians tape so they fit more firmly in the slot provided. 652885



- 20400
by:

i am virtually computer illiterate and capable of VERY limited functions on it of only the simplest range and therefore was resigned to having to place my order over the telephone fully expecting to be forced to listen to countless recordings giving me various "options" to place my order as is so commonplace in today's world when doing business by telephone . I was pleasantly surprised to have my call answered by a very personable and extremely helpful woman by the name of Ashley who made my transaction with this company thoroughly successful as well as pleasantly memorable . After very patiently walking me through the processing of my order from start to finish and ending our call , she then sent me an email that she was able to expedite the shipping on my order at no additional charge adding to the overall exceptional experience . My order arrived promptly as promised completing a flawless experience . 539903



- 20400
by:

I really wanted a 9 ah setup to insure ample power but I could not find one that also had a push button test feature so I decided I would just mount two and configure them to work together. It uses two, dpdt switches to switch the units on and off line either independently or together. This gives me assurance of ample power and a backup to each other.. One thing I'm going to do is run a diode isolated circuit to the cold side of the breakaway switch to the l.e.d. Break lights so if the trailer ever did come lose, it will also apply the break lights. The two diodes will keep the tow vehicles breaklight power from back feeding into the actuator's emergency stop circuit. 403367



- 20400
by:

The Break-away kit with charger and tester and a top mount display is a well made product that took maybe 4 minutes to replace and 8 more minutes to wire. The original was damaged when loading my trailer and no longer charged the battery making the breakaway system useless. I was looking for the circuit board to replace, but the entire unit was well priced and easy to replace. The only thing I would add to the kit are the needed butt splice wire connectors. 310034


Comments

Outstanding product. The blade on my tractor hit the original break-away battery box. ordered this and fit perfect, no changes needed. Works great.

Darrell N - 01/01/2018

32470

- 20400
by:

Perfect item.. i had a battery go dead and lock up my trailer brakes at 65 mph.... no worries from this one! 314986



- 20400
by:

reliable product, Fast delivery 604575



- 20400
by:

Loved it , mounted it and smiled . But your tires Stink ! Blew sidewall cords after 500 miles on a dual axle trailer with 2 Polaris ATVs and fuel . 608529



- 20400
by:

Shipped and received quickly. Products appear to be just as ordered. Thanks again for an easy transaction. 372375



- 20400
by:

This is direct fit for my old one. mounting hole lined right up. My old one had a bad battery and the box was weathered and cracked. This is definitely the way to go, all new stuff. Shipping was really fast! good job folks. I'll be back. 562627



- 20400
by:

Excellent quality brake controller at a great price and fast shipping. No need to shop anywhere else! 725901



- 20400
by:

Very happy with the hitch. Have not used it regularly but very pleased when I do have to use it. 725002



- 20400
by:

Battery Breakaway Box is of good quality & u can utilize the different cutouts for entrance/exit of wiring with common electrical wire knockout clamps , although wiring instructions on battery box need more clarification or better wiring instructions added to product . Also information on test circuit lighting functions of breakaway battery box would be helpful also . 717365


Comments

I have linked a help article with more information on installing a trailer breakaway kit. The article specifically covers wiring a Hopkins breakaway kit with built in charger about half way through the article.

-- Victoria B - 11/05/2019

63194

- 20400
by:

Order received as ordered. Michelle was great contacting me letting me know a part that was ordered would be delayed and found an in stock replacement part. 716660



- 20400
by:

Stuff fit and everything was in the box. Got to me in less than 3 business days with regular shipping. 707562



- 20400
by:

great selection and fast shipping 679392



- 20400
by:

Product was faulty from the factory. It was easy enough to get a replacement part at no cost from the manufacturer, but it should have been an easily seen fault for quality control to catch. It does what is is supposed to however & the battery is of good quality and hasn’t lost significant charge in a year. 673843



- 20400
by:

Great product and price. No complaints 670483



- 20400
by:

Fast shipping & good quality 667346



- 20400
by:

The delivery was excellent on time. Havent install this product yet , I cannot opine on the performance of it at this time. 640459



- 20400
by:

I am making a ice fishing house and the products that I have ordered have all worked great. I have recommended etrailer to everyone that I know . 629259



- 20400
by:

Good product - simple to install - Item came charged and ready to go. Thumbs up! 617437



- 20400
by:

great price, fast shipping 599450



- 20400
by:

Had the parts I needed at the right price. When one item was delayed I was notified and given the choice to choose another item that was readily available. Great service! 583949



- 20400
by:

Good quality product on time 580368



- 20400
by:

Very easy to install. The linked video on etrailer website makes it a no- brainer. One note; if wired as instructed the unit will charge at ALL times. Not a problem as I just unplug the trailer pigtail whenever I park long-term. To avoid this you will have to find power on a switched/accessory cuircuit that is ignition off-power off. 521426



- 20400
by:

This product worked perfectly to replace the broken battery box on my Master Tow car dolly. Excellent product comes with everything you need to install or replace an electric trailer braking system. 517139



- 20400
by:

Exactly what I needed for my trailer! 502446



- 20400
by:

Parts were just what we ordered, and service was even better! Everything arrived even faster than I expected. Thanks! 501785



- 20400
by:

Works nice, peace of mind knowing that my trailer breakway brakes will work even if cabin battery is low 497464



- 20400
by:

Product works well Applies power to the electrical brakes if the cord is pulled Easy to put the cord back into the switch Used on a homemade trailer That was made to carry bale barns (hay feeder for horses) 491485



- 20400
by:

Product was as listed. Shipping was fast. No problems!!! 477351



- 20400
by:

It seems to be working ok, but of course I have not really need to use it. Thanks for asking. 474636



- 20400
by:

I have not installed this product yet, but I did take it out of the box and looked it over. I was surprised that the battery was already pre-charged !! 473767


Comments

Perfect !! I test it before every tow. I mounted the battery box inside and the indicator lights let me know everything is working correctly.

Emmett - 02/08/2019

49274

- 20400
by:

Great product from a great company, nice having the readout and tester on top can see when my battery is charging and how full the charge is at all times. 469640



- 20400
by:

Fast shipping. Product as described 455811



- 20400
by:

Easy install as a replacement for old unit. You always receive a quality product at a good price, 452404



- 20400
by:

Timely delivery and at a good price . Product meets expectations 447956



- 20400
by:

This product worked as expected 438542



- 20400
by:

easy hookup 433935



- 20400
by:

There are so many choices for these brake battery kits it is confusing. I chose this one based on the size hoping I wouldn't have to drill new holes to mount it. I was a little impressed though. Wiring and instructions were no problem at all. The nice part was how water tight the box seems to be and the sturdiness of the box. I waited about 3 months to write this to make sure the 'new' didn't wear off. And yes, I had a friend jog beside me and pull the pin with an attached string at 5 mph and it does indeed work. 426017



- 20400
by:

Exactly what I was looking for. Prompt service excellent quality. Will definitely use etrailer in the future. Thank you very much. 397020



- 20400
by:

Great price. Fast shipping. Precise fit. Great service. Berry happy can you tell? 390493



- 20400
by:

Great little unit. With six bolt holes, this battery box isn't going anywhere. The battery test light is handy and the battery box lid snapping on instead of being part of the mounting screws is a nice feature. The break away switch is nice quality and the cable has a clear coating. All great features for use in northern Canada. 386455



- 20400
by:

Great price on great product. Shipping was super fast. 366069



- 20400
by:

Great on line supplier. Good prices and many products available. Fast shipping , Thanks 365539



- 20400
by:

The service provided by etrailer has been top notch each time I have ordered from them, very professional with fantastic follow through to insure product has delivered and customer satisfaction has been achieved. 347963



- 20400
by:

Easy to install, bolt holes were the same as old one I replaced, I like the test button feature 341691



- 20400
by:

excellent product. Everything I ordered was received in great condition and very fast shipping. Thanks. 339195



- 20400
by:

I installed it on an older trailer. I hope I never need it but is there if I should. 335900



- 20400
by:

THE ITEMS APPEAR TO BE GOOD, HAVEN'T INSTALLED THEM YET. 321267


50
325
Show More Reviews

Ask the Experts about this Hopkins Trailer Breakaway Kit

Do you have a question about this Trailer Breakaway Kit?


  • Recommended Complete Disc Brake Conversion System For 10,000 lb Dexter Axles
  • To replace your leaking seals, you will want the Unitized Oil Seal # 10-51. This is a confirmed fit for your hubs. I've attached a video of an oil seal installation on a similar hub to help. For your disc brake conversion, you will need to use the Dexter Trailer Hub Assembly - 9,000-10,000-lb Axles - 8 on 6-1/2 - Oil Bath # 8-288-3UC1 and then the Kodiak Disc Brake Kit - 11" Rotor - 8 on 6-1/2 - Raw Finish - Leaf Spring - 10,000-lb Dexter # K2R1058D11E compatible with these hub assemblies...
    view full answer...

  • Recommended Trailer Breakaway Battery Braking System with Integrated Charger
  • The Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire # 20099 is the most popular option by far followed by the top loading version # 20400. This is my recommendation for the best option. Many trailer manufacturers utilize this breakaway kit because of its function and ease of use. I've attached a photo to assist with the installation.
    view full answer...

  • Trailer Breakaway Kit Recommendation with 9 amp Hour Battery
  • We don't have a 9 amp hour battery to swap into the battery box of the Engager but I do have a great solution for you. The Dexter Breakaway Kit part # 34-285 is a kit that comes with a 9 amp hour batter and a box large enough to fit the battery size.
    view full answer...

  • What is Needed to Add Electric Brakes to Utility Trailer?
  • In order to add electric brakes to your trailer you are going to need to switch to a hub and drum assembly. For 3,500 lb axles with 15 inch wheels you may be able to use # AKHD-545-35-K but you are going to need to make sure you have a brake mounting flange. I've added a link to our page with flanges so you can find the correct one. The hub and drum assembly I've mentioned uses inner bearing L68149 and outer bearing L44649 and is compatible with # 84 spindles. Your current hub will need...
    view full answer...

  • Electric Trailer Brakes for Boat Trailer With 2,000 lb Axles
  • Thanks for the photo and it looks like you do have 2,000 lb axles so you can use Dexter Electric Trailer Brake Kit - 7" - Left and Right Hand Assemblies - 2,000 lbs # 23-47-48 so long as you have a 4-bolt brake mounting flange such as the Brake Mounting Flange for 1-3/4" Round Trailer Axles - 2K # 4-34 as well as a 7" hub and drum like the Dexter Trailer Hub and Drum Assembly for 2,000-lb Axles - 7" - 5 on 4-1/2 # 8-257-5UC3. If you need a new hub and drum assembly you do need to know...
    view full answer...

  • Can Breakaway Switch By Itself Be Used If Trailer Already Had Battery
  • If you have a battery already on your trailer that's getting a charge and would be adequate to hold the brakes of your trailer in the event of a breakaway you could wire just a switch from it to your brake output circuit and you'd be fine. For that you'd only need a switch like the # FA80-00-2040 for a kit with a coiled cable or part # 2005-P for a kit with a straight cable. The battery setups like the part # 20099 would only be needed if you also needed a battery to power the system.
    view full answer...

  • Wiring for Curt Echo Mobile Wireless Brake Controller and Adding Electric Brakes to a Trailer
  • The Curt Echo Brake Controller part # C51180 is a great choice because of its convenient and simple installation. The 7-way connector that you mention part # A10-7084VP pugs into the 4-way connector you purchased part # C56217. The white wire from the 7-way plug needs to be grounded to a clean bare metal surface on the vehicle's frame. You are correct, the black wire from the 7-way connector needs to be extended from the plug into the engine cavity and to a 40 amp circuit part # 9510...
    view full answer...

  • What is the Difference in Hopkins Engager Breakaway Systems 20099 and 20400
  • Hopkins Engager breakaway systems # 20099 and # 20400 function the same way and have the same features. The main difference is in how they mount. Engager # 20099 is meant to be mounted on top of the frame with the LED indicator and test button facing up. Engager # 20400 was meant to be mounted to the side of the trailer frame so that its LED indicator and test button are also facing up. You will want to make sure the battery in the system you use is protected. That is why breakaway systems...
    view full answer...

  • Parts Needed to Add Electric Drum Brakes to Trailer with 3500-lb Axle
  • Starting with your Cherokee, the Prodigy P3 trailer brake controller # 90195 is an excellent choice. This is a superb controller both for performance and reliability. In your 4-pole equipped Jeep vehicle you will hard wire the P3 using the # ETBC7 installation kit. These two items will provide a complete 7-way wiring setup that will generate and deliver trailer brake power to the 7-way socket included in the kit along with all of the required trailer lighting signals. I linked both a...
    view full answer...

  • Comparing Hopkins Engager Breakaway Kits 20400 and 20099
  • Pretty much the only difference between the Engager breakaway systems # 20099 and # 20400 are the designs of the battery boxes. Both function the same and have the same features. Engager # 20400 is meant to be mounted to the side of the trailer frame whereas # 20099 is designed more from the top of a frame. But ultimately you could install them anywhere there is space so I wouldn't say one is better than the other for you trailer.
    view full answer...

  • How to Tell If Your Breakaway Switch Is Powered By Trailer Battery or Auxiliary Battery
  • If you already have a breakaway switch and trying to find its power source, It is possible that someone could have wired the breakaway switch directly to the main battery on the trailer but it does not come like that from the factory. The breakaway switch should be wired to a separate battery. Most Breakaway switches come with their own battery and some come with a battery charger. The breakaway box is essentially a plastic box with a battery in it that powers the breakaway switch. When...
    view full answer...

  • Trailer Breakaway System Operation And Troubleshooting
  • The brakes shouldn't necessarily lock up, but the brakes should quickly bring the trailer to a safe stop. The weight of the trailer shouldn't matter if the breakaway kit and the trailer brakes are working properly. All trailer from utility to RV with a much larger weight capacity than the 5,000 lbs you mentioned use breakaways like the Hopkins # 20400. If it isn't functioning to a safe level, there is a need to fix something. It may be a ground, it may be a brake magnet, it may...
    view full answer...

  • Can Air Over Hydraulic Trailer Brakes be Converted to Electric Over Hydraulic on Military Trailer
  • Since the braking power is still hydraulic, you should have no issues converting from a vacuum over hydraulic system to an electric over hydraulic system. The electric over hydraulic actuator will take the place of the vacuum that pressurized the existing brakes. If your trailer has disc brakes, the # HBA16 actuator that you referenced is a great choice. If your trailer has drum brakes, you will want the Hydrastar Electric Over Hydraulic Actuator for Drum Brakes # HBA-10. Often,...
    view full answer...

  • Maintaining a Breakaway Trailer Battery in a Cold Colorado Winter for 6 Months
  • I recommend a battery charger like # CTEK56158 which has a cold weather mode (up to -4 degrees F) and you can leave it connected for extended periods of time without damaging the battery or charger. If it gets colder than minus 4 degrees then taking the battery inside to charge would be the best idea. I have included some helpful links on battery chargers for you.
    view full answer...

  • What Separate Power Source Needed For Breakaway Switch
  • It looks like you have everything wired right so if everything is working then you are good to go on wiring. With regards to the power source, most states require a separate and dedicated power/battery source for your breakaway system so the 12V pole on your junction box will not work. If you want an entire breakaway kit that includes a breakaway switch, I recommend the Hopkins Engager Push-To-Test Trailer Breakaway Kit, Item # 20099. This kit includes built-in battery charger, push-to-test...
    view full answer...

  • Where is the Best Place to Install Engager Trailer Breakaway Kit
  • The Engager Trailer BreakAway Kit # 20400 can be mounted to either a trailer's frame or jack. The recommended method is to use the weld on bracket part # HM20107. It does not come with U-bolts but it does have holes in the mounting brackets to allow it to be attached. No mounting hardware is included so you'll need to get that separately.
    view full answer...

  • Breakaway Battery Recommendation for Triple Axle Trailer
  • I have a couple of breakaway battery kit options for you, but the Hopkins Engager Trailer BreakAway Kit # 20400 is not compatible with your triple axle trailer. The # 20400 is only designed for use with single and tandem axle trailers. For your triple axle trailer, you will want to use a breakaway battery that is designed to work with triple axle trailers. I recommend using the Tekonsha Push to Test Breakaway Kit with Premium Integrated Charger # 50-85-313 because it has the same great...
    view full answer...

  • How to Install and Test Trailer Breakaway System 20099
  • We can help you with installation and testing of a trailer breakaway system. I linked a wiring diagram for your reference. Two articles are also linked for you. One covers the complete installation process of a breakaway system such as # 20099 and # 20400. The other article covers testing the system for proper operation.
    view full answer...

  • Mounting the Hopkins Engager Push-To-Test Trailer Breakaway Kit on Horse Trailer
  • It's pretty easy to mount the Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger # 20400 on your horse trailer; the kit actually comes with self-tapping screws so you simply need to use those to mount it on an available space on your trailer. If you are having trouble finding an area to mount the kit you can also use the Weld-on Trailer Frame Mounting Plate for Hopkins Engager Breakaway Kit # HM20407 which you can weld onto your trailer frame to mount the...
    view full answer...

  • Upgrading Trailer Battery on Horse Trailer from SLA1055 to a Standard 12V Battery Size
  • It appears you are using a breakaway style battery for your trailer power. If this is correct, you will still need the breakaway battery separate by law, but you can absolutely add a larger battery (often deep cycle) to your trailer. To add that larger standard 12V trailer battery, you will need a location to house it. If you don't already have a location, then I recommend the NOCO Snap-Top Battery Box with Strap for Group 24 to Group 31 Batteries - Vented # 329-HM318BKS. Then you will...
    view full answer...

  • Comparing Trailer Breakaway Switch Kits
  • Some different brand names of trailer breakaway kits do originate from a common source, and this is also true for items like jacks, landing gear and steps. There really is not a lot to distinguish one from another, since their component parts are virtually identical: a battery, a box, a charger and a switch. The one part that can make a difference is the battery itself. A higher output battery can power brakes on more axles. Hopkins Engager Trailer BreakAway Kit # 20400 can handle 1 or...
    view full answer...

  • Breakaway Battery Kit for Sundowner 2 Horse Trailer
  • The Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Top Load # 20400 will absolutely work with your Sundowner 2 horse trailer. I've attached some videos to assist and have also attached the diagram and an article to assist.
    view full answer...

  • Can Vacuum Over Hydraulic Brakes be Converted to Electric Over Hydraulic Brakes
  • Since the braking power is still hydraulic, you should have no issues converting from a vacuum over hydraulic system to an electric over hydraulic system. The electric over hydraulic actuator will take the place of the vacuum that pressurized the existing brakes. If your trailer has disc brakes, the # HBA16 actuator that you referenced is a great choice. If your trailer has drum brakes, you will want the Hydrastar Electric Over Hydraulic Actuator for Drum Brakes # HBA-10. Often,...
    view full answer...

  • Dexter EOH Disc Brake Actutator Compatibility with 2018 Ford F-350
  • The only modification needed on your F-350 to enable use of an electric-over-hydraulic trailer brake actuator like the Dexter # K71-650 (for drum brakes) or # K71-651 (for disc brakes) is installation of a trailer brake controller such as the Prodigy P3 # 90195. Not all trailer brake controllers are compatible with EOH actuators but the P3 has this capability that is easily selected on its main menu screen. The P3 also lets you store specific power settings that you can call up when...
    view full answer...

  • Troubleshooting Trailer Break Away System
  • The break away system on a trailer would typically have its own battery, like that shown with part # 20400. The reason that pulling your break away switch does not actuate your brakes is that it is not wired correctly. The break away switch should be wired so that it is a normally open circuit that closes when the pin is pulled. When the pin is pulled, the circuit closes, allowing voltage to travel to the trailer brakes. One leg of the switch should be wired to the positive terminal...
    view full answer...

  • How to Wire Break Away Switch on Hopkins Engager Break Away System
  • The black wire from the break away switch will connect to the blue wire from the break away box, as shown in the provided diagram. By 'brake wires' I'm assuming you're speaking of the wires connected to the brake magnets on your brake assemblies. One wire exiting the brake magnet could connect to the brake output circuit, usually a blue wire and the other would ground to the trailer frame. It doesn't match which goes where.
    view full answer...

  • Do You Carry the Pin for Engager BrakeAway Kits / Systems?
  • We do carry replacement pins for the Engager Trailer Breakaway Systems. Item HM20010 has 7inches lead wires, and item number HM20014 has 44 inches lead wires. I will link you to both items below.
    view full answer...

  • Trailer Breakaway System with Charger and Light
  • Most Break away systems will have an integrated charger but not all of them do. I've attached a wiring diagram of the difference so you can compare your system. The best way to tell is to check out the wiring and use a multimeter like # BTMT15 to test the voltage on the wire going to your trailer battery when the trailer is connected to your vehicle and the vehicle is running. If you want the integrated charger and the light to test, I recommend the Hopkins Engager Push-To-Test Trailer...
    view full answer...

  • Replacement Parts For Older Model Hopkins Engager Breakaway Kit
  • The Hopkins Engager's box design and mounting brackets have changed over the years. There is a Side load Hopkins Engager available and a top load style. The Hopkins Engager part # 20400 is considered top load because you can see the lid from the top of the unit but the brackets do not allow you to install the box upright on the trailer's tongue like in your photo. The old style entire unit is no longer available but the replacement box part # HM20121 is available and can be installed...
    view full answer...

  • Comparing Hopkins Trailer Breakaway Kits 20099 and 20400
  • Yes, both Hopkins trailer breakaway kits you referenced, parts # 20099 and # 20400, are complete and equivalent breakaway kits that differ only in the manner that they mount to the trailer. Part # 20099 mounts on the side of the trailer frame while part # 20400 can mount to the frame or to the trailer jack. I have linked in installation video for both kits as well as a helpful article.
    view full answer...


Do you have a question about this Trailer Breakaway Kit?




  • Why etrailer.com?

    At etrailer.com we guarantee:

  • Highest quality trailer breakaway kit for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer breakaway kit information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Satisfaction Guarantee
    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Victoria B
Updated by:
Adele M
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Brian T
Installed by:
Cole B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.