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Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire

Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire

Our Price: $53.49
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Trailer Breakaway Kit
Shipping Weight: 4 lbs
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Hopkins Trailer Breakaway Kit - 20099
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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. Great Prices for the best trailer breakaway kit from Hopkins. Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire part number 20099 can be ordered online at or call 1-800-940-8924 for expert service.
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Hopkins Trailer Breakaway Kit

  • Kit with Charger
  • Side Load
  • Hopkins
  • Single-axle
  • Tandem-axle
  • LED Tester

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.


  • 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
  • Side-loading case is easy to access from the side
    • 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


  • Application: single- and tandem-axle trailers with electric brakes
  • Case dimensions: 4-1/8" long x 5-5/8" wide x 5-1/8" tall
  • Battery capacity: 5 amp-hours
  • Mounting hole spacing:
    • 1-1/2" From center of hole to center of hole horizontally
    • 7/8" From center of hole to center of hole vertically
  • Lead wire length: 7"
  • 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.

20119 Hopkins Engager Break Away System with LED Battery Monitor and Charger - Side Load - 5 amp/hrs - 7" Wiring


Item # 20099

Installation Details 20099 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire - 20099

Average Customer Rating:  4.8 out of 5 stars   (643 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.


While Hopkins has made a similar product for ages, this newer iteration is less easy to use. Instead of an actual button, to check battery level, you have to push the plastic casing in, with your finger. I can’t do it. So, you essentially need a tool to check battery level. Lame. I wish my older version still worked.



After a year, it’s still functional, but the test “button” still sucks. Without a hard object like a took or a pocket knife handle,it’s impossible to depress the test button which is just a molded detent in the plastic case to see if the battery is charged. I rarely check anymore.

Etrailer Expert

Mike L.


@Lewis We're sorry to hear that you're less than happy with the changes Hopkins made to the battery test portion of the break-away system. They tell us that the change was made in order to seal the battery box better against water intrusion.


I will just make this short, overall it’s a good product, straight forward, easy to install. I wanted something that would keep my break away battery charged. With a built in battery charger and indicator this fit the bill. I however find that it is very susceptible to rain intrusion because there is no seal between the lid and battery box. The charge indicator light will come on and kill your battery, so because I needed this thing on the road, I dried it out and sealed it up with silicone. I did contact E-trailer and the where very helpful with my issue.


Got my breakaway kit in 2 days. It took 2 Hrs to GREAT>>>>>it replaced the 7 year old dead batt and kit on trailer.
My trailer don't have a "power" wire for the charger..if your trailer does cut 30 min's off install time. As a professional truck driver
SAFETY FIRST on my trailer...and the Test button lets me know it is good to go.

SAFETY FIRST on my trailer...and the Test button lets me know it is good to go." />


I had made several purchases from Etrailer and I have always got great parts service and fast shipping. We all work hard in life to be able to enjoy our hobbies. Rather it be Camping, hauling your race car to the track or keeping your work trailers in good working order. It is nice to have a company that is there to help you maintain your equipment in a economical, knowledgeable,and friendly way. If you are looking for advice,quality parts and trustworthy service look no further. Thanks Will and etrailer for helping me get me rig back on the road and safer. You guys are the best!


I bought this brake away system one year ago and have had zero issues. I like the display and the test button still works. Great product, this trailer lives outside far so good.


Worked as advertised. Better case to seal out the weather


Easy installation at a fare price


all good, great service


Awesome service.


Arrived as scheduled. I was replacing stock unit so I only had to drill one hole and cut and splice wires. Very simple and easy installation. Product seems tough built and so nice now to check battery with the push of a button.


Great customer service and website


Was exactly what I needed for adding electric brake axles to my boat trailer. I'm very happy with this product and with the service from


Arrived within a couple of days, everything I thought it would be, took a hour to mount because I soldered and heat shrunk all connections. Everythng I've ever bought from etrailer has been quality parts.


Great customer service. A wrong item was sent. They went above and beyond to fix the situation


Installation was easy as this was a rep lacement.


purchased 2 roof vents and a breakaway kit with charger.Very good quality and very good and quick service.Hopkins breakaway kit has battery with charge control and switch with cable and a great price. Ventline basic roof vents with screen and hand crank and a great price too!!!



I have purchased these product previously and never had any problems with either. Thanks


Bought this to replace the box that was torn up by thieves who stole my trailer. Previous box did not have the battery charge tester, so this is a nice upgrade. Very durable construction. Easy installation and instructions, which included a good drawing. Super fast shipping, which prompted me to order more items. Have dealt with in the past, and I am glad that I returned.



Hi Patrick, thanks for the one year check-up.I have had no issues with the kit, it all works like it is supposed to. Thankfully, I havent had to test it for what it is designed for.


The lid of the battery box was almost impossible to open due to little plastic latches that were very hard to depress to unlatch the lid. No instructions were included on that. When I got the battery box mounter (replacing a previously installed one) the lid flew off the first time on the road, despite my having pressed the latches home as firmly as possible. Don't bother!

Etrailer Expert

Jenny N.


I will have our Customer Service team reach out to you.


I converted my car trailer from surge to electric and it could not have been easier
The box was perfect for my needs and has held up well for the first year
All the parts from one site at a great price!

Jay M.


A year later and this product has held up and worked perfectly. Was easy to install and of good quality. I would buy this again if I had a trailer that needed one.


Highly recommend. Own a 99 F250 7.3 diesel.

install. No issues. We have not had to use the break away aspect thankfully but have no worries that it would work well if the need ever arose.

We replaced our breakaway due to hitch failure on the truck. The bolts had loosened over time and one was missing. The whole hitch system fell to the ground under a full load at a red light. After my husband hyperventilated we were able to get traffic to stop and go 25 feet to safety.

We are very familiar with the need for a break away and highly recommend. What happened to us is rare and our mechanics are so paranoid now that inspection of hitch systems no matter the truck are fully inspected so far they have found and prevented five potential disasters.

All of our replacement items came from etrailer....hitch...ball..tongue and breakaway. We upgraded the weight limit of the hitch matching the weight to ball and tongue. We are currently saving to replace our jack to a more heavy duty easy use high weight bearing. When we do we will head to etrailer for our new jack.

Highly recommend this company and all of the associates we have talked to have been great.

Btw upgrading the hitch and tongue to handle weight has helped our hauling ability, ride and fuel. mileage.

Have a wonderful day


Well, you may not see the actual brake controller in these shots, but I wanted to display just how much etrailer product was used to restore this old trailer. Re-decked the trailer, new wheel bearings, added brakes on all 4 with this brake controller and battery powered emergency disconnect... new rust protection, primer and paint, new lights and wiring all the way around, new wiring harness/box, and new tire carrier. Nearly all product except the decking and paint was from etrailer. the customer support was fantastic, I highly recommend this company!


Item was a perfect replacement. Very similar to the original of the same brand, and even the mounting holes lined up perfectly. I've installed it on a 30 foot flatbed PT Trailer Gooseneck and it works great!



Product has been working flawlessly. Its been great!


Item came with NO installation instructions. Had to search, download and printout on my own. Item P/N was NOT listed on mfr's site but did find instructions under a different PN. No mounting hardware (screws) were provided. Item was successfully installed on Utility/Car Mover trailer and appears to work properly. Battery capacity is minimal (5VA) - will power a single axle brake (5 amps) for less than an hour. Tow vehicle battery charger (12v) circuit is mandatory. No provision for an external battery charger connection is provided. DO NOT TEST while electrically connected to tow vehicle - it will damage your Brake Controller. This is important because connecting the breakaway switch lanyard as recommended requires pulling the plug from the switch which back feeds 12v to the tow vehicle's brake controller. Must connect the lanyard BEFORE connecting the trailer electrical cable and vice-versa when disconnecting. Switch mounting plate is very thin and flimsy - easily bent when applying force necessary to reinsert breakaway plug. Must hold the housing while inserting. Do not install the battery housing or switch where subject to possible external physical impact forces or loads. They are both plastic and easily damaged.


Items were poorly packaged. Grease caps were damaged. Grease seals were sized wrong. No instructions for breakaway switch. Brakes were not assembled properly causing significant time troubleshooting the issue. Called customer service, representative sounded insincere when apologizing. E trailer did send new grease caps, did not offer any compensation for incorrect grease seals. They also told me to contact Hopkins regarding an issue with the breakaway switch wiring. Overall good pricing, poor packaging, and mediocre customer service. After all the positive reviews, I expected more.


The Hopkins battery box and break away switch showed up in record time with a fully charged battery. I also purchased a 7 blade plug / 24' 7 wire / 2 termination boxes. My old horse trailer has 18 various lights, some always hot, some on toggle, some running lights, stop and turn signals. I used 2 term boxes, front and rear, to help me in chasing future shorts but couldn't find a termination box at my local store. Etrailer had everything I needed to complete my project. I'm looking forward to purchasing trailer tires/rims from this company. The prices can't be beat, assuming free shipping.

Show More Reviews

See what our Experts say about this Hopkins Trailer Breakaway Kit

  • Breakaway switch layered pulled out and melted down. Now the rear trailer brakes are locked
    The Hopkins # 20099 Breakaway switch has a battery in the main box. Then the breakaway tab is pulled out the battery engages the electric brakes on the trailer. The brakes remain engaged until the breakaway tab is reinserted, or the batter runs out of charge, at which time the brakes release. Since a few days have past your breakaway battery has discharged. I would determine why some thing melted down and repair or replace those parts. I would also check the condition of your battery....
    view full answer...
  • Will a Breakaway System Still Send Power To The Trailer Brakes If the Charge Line Is Disconnected
    Yes, the breakaway battery must have a charge in order to send power to the trailer brakes and lock them up in the event of the trailer detaching from the tow vehicle. If the charge wire which is usually the 12 volt pin on the 7-way becomes disconnected then the breakaway battery will still hold a charge and send power to the brakes but it will loose this charge over time if the charge wire is not reconnected. The Hopkins Engager Push-To-Test Trailer Breakaway Kit part # 20099 comes with...
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  • Does a Breakaway Switch Require a Separate Battery
    I am not entirely sure I understand your question. In regards to a breakaway system, the switch needs to have a separate battery for power according to most state regulations. You will need to check with your state's DOT but it is safe to assume you will need a separate battery for the breakaway switch. The seperate battery is not needed because of the amount of power pulled through the switch but rather as a backup in case something were to happen to the trailers main power source. The...
    view full answer...
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  • Can Hopkins Engager Trailer Breakaway Kit # 20099 be Reset or Does it have to be Replaced
    You can reset the Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20099 simply by putting the pin all the way back into the switch. The only time the system would have to be replaced would be if something was wrong with it and even then the subcomponents such as the switch, pin, box, and lid are all available as replacement parts. There have been times where people used a regular car battery with a breakaway system and that can cause problems. Basically, a regular car battery will...
    view full answer...
  • Does A Breakaway System Need To Be Reset After The Pin Is Pulled
    A breakaway system like the Hopkins Engager Push-To-Test Trailer Breakaway Kit part # 20099 will go back to working as normal once the pin is inserted back into the switch. There is nothing else that needs to be done to reset the system once you plug the pin back into the switch. That said, it might be a good time to make sure the brakes did indeed lockup when the pin was pulled because if they did not then the system is not functioning correctly and will need to be repaired or replaced.
    view full answer...
  • Trailer Breakaway System Recommendation for a 1993 Horse Trailer
    The most popular trailer breakaway kit we offer is the Hopkins Engager part # 20099. This comes with a charger and a battery, plus a display on the box to let you know exactly what condition the battery is in. I attached an install video for you to check out as well.
    view full answer...
  • Where Do the Wires in the Brake Away Switch Connect on a Trailer
    You will splice one wire of the Break-Away Switch to the electric brake wire coming from the trailer side connector. The other wire on the switch connects to the break away box. It should not matter which wire is used for which function. I have included instructions for the Engager Trailer BreakAway Kit with Charger and Tester, # 20099, that will help you to wire the break away switch and the rest of a brake away kit. The referenced kit has a charger, if your break away system does not...
    view full answer...
  • How to Install a Trailer Break Away System
    I do not recommend that you bypass the break away system because in many states it is a requirement to have a working break away system. Trailer brake magnets will have one power wire and one ground. The power output from a break away system will go to the magnet power wire. The input from the trailer connector goes to the breakaway switch. We do have a handy FAQ article and video that I have linked for you that will help. I have also linked an FAQ article on testing break away systems...
    view full answer...
  • Should Trailer Brakes Hum While the Breakaway Pin Is Pulled
    Yes, when the pin on a breakaway system like the Hopkins Engager Push-To-Test Trailer Breakaway Kit part # 20099 is pulled that then sends full 12 volt power to the trailer brakes. When power is sent to an electric braking assembly you may very well hear sort of a humming noise and this is not uncommon at all nor it is an indication that a problem is present.
    view full answer...
  • Correct Battery Power Source for Trailer Emergency Breakaway System
    Towing laws vary by state and province and they can change at any time, so it is best to check with the highway authorities in the specific area you intend to travel. But even if it is not illegal to use the primary trailer battery to power the breakaway this is not a good idea for safety reasons. Such a remote power connection means longer wiring and that means more potential for something to get pinched, damaged or shorted. The benefits of a separate dedicated trailer breakaway battery...
    view full answer...
  • Would Cut Wires of Trailer Breakaway System Cause Brakes to Lock Up
    A trailer breakaway system with cut wires would still be movable. In the most basic terms a breakaway system actually "connects" wires when it's locking up the brakes of the trailer so cutting some of them would not cause the brakes to lock up.
    view full answer...
  • Troubleshooting Check Trailer Wiring Message on 2017 Chevy Silverado 2500
    I took a look at the owner's manual for your 2017 Chevy Silverado 2500 and it said that if the "Check Trailer Wiring" message appeared you have the Integrated Trailer Brake Control (ITBC) and it indicates there is a short in the wiring going to your electric brakes. You will need to go over that wiring and look for the short, paying attention to any broken, crimped or otherwise damaged wires.
    view full answer...
  • Switching Off Brakes when Traveling Steep Pass?
    A solenoid in a surge brake actuator only prevents your brakes from locking up while going in reverse, so disconnecting it would not be effective. Also, please do not go down a steep pass with a trailer and try to avoid using brakes; the weight of the trailer will push your tow vehicle and you won't have as much control. If you go slowly you won't burn out your brakes and more importantly it is much safer to use your brakes when going downhill.
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  • Can a Breakaway System be Reset by Putting the Pin Back Into the Switch
    Yes. The only thing the switch does in a breakaway system such as # 20099 is complete the circuit from the breakaway battery to the brake magnets when the pin is pulled from the switch. By inserting the pin back into the switch it separates the metal contacts inside effectively resetting the system.
    view full answer...
  • Where to Wire Breakaway Poles of Trailer Breakaway System
    Sounds like you are wiring in a breakaway system to your trailer like the part # 20099. I attached a diagram that shows how it all connects to a trailer's wiring. Basically the switch installs between the breakaway battery and the brake output circuit of the trailer so that when the pin is pulled the battery puts it's current onto the brake assemblies.
    view full answer...
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  • Will Having Breakaway Battery and Dump Trailer Battery Connected Cause Problems
    When two batteries are connected together they will attempt to balance the same voltage so if one battery was less charged than the other it would draw amperage from the other one till they both balanced out. It really won't hurt anything, but if you drain the dump battery from using the dump feature you will eventually drain the weaker breakaway battery too as it struggles to charge the larger battery. It would be probably your best option to have the two on separate charge wires.
    view full answer...
  • Do Trailer Break Away Batteries Need to Be Installed Right Side Up
    We offer break away systems from Hopkins and Tekonsha. Tekonsha uses glass mat batteries, while Hopkins uses gel filled batteries. Both types of batteries are sealed, and both manufacturers tell me that the batteries can be installed in any orientation you wish. For more information on trailer break away systems, click the provided link.
    view full answer...
  • Why Does the Brake Output Circuit of Trailer See Intermittent Voltage When Connected to Tow Vehicle
    Based on what you described it sounds like you have everything wired up correctly. The first thing I thought of when you described the intermittent voltage you are seeing is that brake controllers will send a small amount of voltage back on the brake output circuit to test to see if a trailer is connected. Have you tried driving the trailer and seeing if everything works correctly? Everything might be wired correctly as-is and you would be ready to go. I attached an FAQ on breakaway...
    view full answer...
  • Troubleshooting Brakes Not Working After Installation of Breakaway and Heavy Rain
    The yellow light on the # 20099 is normal and indicates charging. If you tried the manual override and the brakes didn't work, I'd check out everything from the installation and make sure nothing got wet that shouldn't. Also make sure all of your connections are still secure. If you tried using the brake pedal and nothing happened while sitting there, it is because you have to be moving for a proportional brake controller to send power to the brakes.
    view full answer...
  • How Would the Engager Trailer BreakAway Kit # 20099 Install on a Trailer
    It would be pretty straightforward. You would want to remove your current breakaway system and install an Engager Trailer BreakAway Kit # 20099 like you referenced. To see how it would install I attached installation instructions, and install video, plus an FAQ article on these systems.
    view full answer...
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  • Troubleshooting Trailer Brake Controller Saying N.C When Breakaway Pin Is In But C. When Removed
    Since the aftermarket trailer brake controller says N.C (Not connected) when the pin is installed in your breakaway switch, but .c (connected) when the pin is removed it is more than likely due to the breakaway kit wires are connected incorrectly and are not sending the braking signal to the brakes unless the pin is pulled. It looks like you were looking at the Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire # 20099 so if this is the breakaway...
    view full answer...
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  • How to Recharge the Battery on Hopkins Engager Breakaway Kit With Built-In Charge
    Since the red light comes on with your Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger # 20099 it means the battery does not have the proper charge, and thankfully this is very easy to remedy. All you have to do, as evidenced by the cut out of the linked instructions I added, is connect your trailer plug to your tow vehicle. After about 20 minutes or so the battery on the Engager will be charged and you'll be set.
    view full answer...
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  • Do Trailer Breakaway Kits Have Diodes to Prevent Backfeeding
    The breakaway kits we offer like the # 20099 do have one-way diodes built into the lid of the boxes so that when the trailer isn't connected the breakaway battery doesn't try to power the rest of the trailer. If you are using a car battery setup that would explain why that's happening. When the breakaway pin is pulled the brakes should activate and make just as much sound as if they were being activated with a brake controller. I attached a help article on troubleshooting breakaway kits...
    view full answer...
  • How to test Hopkins Trailer Breakaway Kit when LED test light doesn't work
    Since the test light isn't illuminating on your Hopkins Engager Push-To-Test Trailer Breakaway Kit w/ Built-In Charger - Side Load - 7" Wire # 20099, it sounds like it could be one of the following issues: -test light is burnt out -breakaway kit is faulty -wiring is incorrect or damaged I would start by unplugging the trailer wiring connector from the tow vehicle, then pull the lanyard pin on the breakaway system and see if your trailer brakes are engaged when you try to slowly pull the...
    view full answer...
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