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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

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Trailer Breakaway Kit
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Hopkins Kit with Charger - 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. Lowest 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 1-636-306-4830 for expert service.
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Hopkins Trailer Breakaway Kit

  • Kit with Charger
  • Side Load
  • Hopkins

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 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   (513 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.


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!

I will have our Customer Service team reach out to you.
-- Etrailer Expert Jenny N - 04/15/2022


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.


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.


Helpful and courteous good source for trailer needs. Will be buying from again.


Installation was easy as this was a rep lacement.


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.


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 buy all my trailer parts from here. Will not buy from anywhere else. Great product selection, prices and fast shipping.


Received order promptly,it was what I needed. To repair my trailer braking ability, my trailer is now safe to operate on the highways . Thanks.


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.


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.


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.


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.


so far so good, much better than the top test unit. over time the top test button would take water in and short out the board inside. this one having everything on the side works much better


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
Bader,dennis - 10/08/2018


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.
-- comment by: Gary - 02/14/2014


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!

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.
JAY M - 04/25/2020


The product itself was fine. However, no instructions were included. It would be nice to have those for reference.

Nikki N - 06/23/2021


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


This is a very good product.We have it on a goose neck horse trailer.Would buy it again

Great Product would buy again
Peggy M - 04/25/2021


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!


Good price, easy to use, no issues. Placed on drawbar for easy access.


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.


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!
Art - 06/18/2019


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.

Show More Reviews

See what our Experts say about this Hopkins Trailer Breakaway Kit

  • Does Charged Light Always Stay Lit on Hopkins 20099 When Battery is Charged
    The green indicator light that shows the battery is charged will stay on all the time as long as the batter is fully charged.
    view full answer...
    Image 1 for
  • Service Trailer Brakes Message on Truck After Breakaway Cable Pulled
    The "Service Trailer Brakes" message you are seeing will sometimes appear after the breakaway plug is pulled because the breakaway battery will send voltage back up the brake controller wire. A simple fix is simply disconnecting your truck from the trailer. You will then disconnect the battery on your breakaway system, then insert the pin and reconnect the breakaway battery. After connecting your truck again, this should hopefully clear the error message. If you still have the message...
    view full answer...
  • What Does Yellow Light on Lid of Hopkins Engager Indicate
    The Hopkins Engager # 20099 has a lid on it that displays the current status of the battery. When it is plugged in and charging it will be yellow at all times. When you hit the test button it will either then turn to green indicating it is fully charged or red indicating it is in need of charging.
    view full answer...
  • Troubleshooting Hopkins Trailer Breakaway Unit That Does Not Engage Trailer Brakes
    You can refer to the linked article on breakaway kit installation for help in confirming that your Hopkins unit is wired correctly. The two blue wires from the switch should be spliced to the trailer brake circuit and to the breakaway battery box, as shown in the linked diagram. Also be sure the ground and 12V power wires, white and black wire respectively, are connected securely. If it is wired correctly the issue may be that your breakaway battery is not fully charged. A fully-charged...
    view full answer...
    Image 1 for
  • Recommended Hopkins Engager Breakaway Kit
    I have exactly the kit you are looking for. It is the Hopkins Engager Push-To-Test Trailer Breakaway Kit with Built-In Battery Charger - Side Load # 20099. It has precisely the specs you are requesting. This is a very common factory component on many trailers. I've attached some videos to help further.
    view full answer...
  • Are Trailer Breakaway System Supposed to Lock Up Trailer Brakes when Activated
    Yes, a trailer breakaway system like the # 20099 is designed to apply the maximum amount of braking power to the trailer brakes when activated so the brakes should lock up. I attached a couple help articles on breakaway systems for you to check out as well.
    view full answer...
  • Trailer Breakaway Switch Wiring
    You must have a separate trailer-mounted battery to power the trailer breakaway in the event of a vehicle/trailer disconnect. This can be a small breakaway battery like that included in kit # 20099 or it can be a full-size trailer-mounted battery that also powers lights, etc. Either way the battery that will stop the trailer in a breakaway emergency must receive a continuous trickle charge from the tow vehicle's 12V charging circuit. The two linked articles will guide your installation...
    view full answer...
  • Can Hopkins Engager Breakaway Kit Be Submerged
    The Engager Trailer BreakAway Kit with Charger and Tester part # 20099 is weather resistant but not waterproof. Which means that you would not be able to submerge the battery and box in water but it would withstand inclement weather. Ideally your best option would be to mount the battery in a location that is up high enough that it would not get submerged while backing the trailer in the water. Or at least close enough to the coupler that it would not get submerged. I attached an link on...
    view full answer...
  • How to Test Trailer Breakaway System for Proper Operation
    A trailer breakaway system should energize the trailer brakes when you pull the pin WITHOUT it connected to the tow vehicle. You do not want to test a breakaway in this manner with the trailer plug connected as this can damage the brake controller. Please refer to the linked articles on breakaway installation and testing.
    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...
    Image 1 for
  • Battery with the Engager Trailer BreakAway Kit with Charger and Tester # 20099
    For safety reasons you need to make sure the battery is fully charged before use. The battery will most likely have some charge from the factory but that charge can dissipate between the time it is manufactured until you receive it.
    view full answer...
  • How to Wire the Engager Breakaway Kit to Charge the Breakaway Battery
    The black wire on the Engager breakaway system # 20099 will be connected to a 12v auxiliary power wire coming off of the trailer connector. This wire is typically the number 4 black terminal in the 7-way connector, but you will need to test to determine if your plug is wired this way, as the auxiliary function can also be located on the center pin. Installing the black wire from the breakaway system to the 12 volt power source will allow the battery to charge when you have the trailer...
    view full answer...
  • Can the Engager Trailer BreakAway Kit with Charger and Tester be Mounted on the Bottom of Tool Box
    Although this battery is designed to install on the side of the frame on your trailer, it should still work properly if you install it on the bottom of your tool box. The battery is completely sealed so you will not have to worry about the internal chemicals leaking out. Something to keep in mind is that the box might see some extra wear and tear if you are installing under your tool box instead of on the side of the frame.
    view full answer...
  • Recommended Breakaway Battery Kit To Replace Missing Battery And Pin
    The batteries of a breakaway kit are fairly universal. They are all 12V and have the quick connect pins. The only differences are really the shape of the battery. The breakaway pins can have different shapes and styles. I recommend you get a complete kit with the new battery and new breakaway switch so you know everything will work together properly. The engager has a different look now with a charger and tester integrated. I recommend the Hopkins Engager Trailer BreakAway Kit with...
    view full answer...
    Image 1 for
  • Troubleshooting Electric Trailer Brakes that Do Not Engage with Brake Pedal
    Are you getting power on the pin in the 5 O'clock position on the 7-way at the rear of your 2016 Ram 3500? This is the brake output circuit. That's the first thing you need to check to find if the problem is with the truck or the trailer. If there's not power on the brake circuit the problem is likely a blown fuse. You said you already replaced the 7-way. Was this on the truck or trailer? Whichever it was inspect the other one for corrosion and clean it if need be. If the truck is...
    view full answer...
  • Troubleshooting Engager Trailer Breakaway System That Keeps Brakes Engaged
    It sounds like you have a short in your Engager breakaway kit's wiring that is allowing the breakaway battery's power to reach your brakes even when it should not. With the plunger in place there should be no power going to the brakes. There is likely to be some wiring that is shorted to the trailer frame that is letting the battery power bypass the switch and reach the brakes. You will need to inspect and either repair or replace any damaged wiring. Look for wires with worn or cracked...
    view full answer...
    Image 1 for
  • Should Brakes Lock Up On 1998 48 Foot Kraft Trailer Lock Up When Breakaway Pin Is Pulled?
    When you pull the pin on a breakaway like the Engager Trailer BreakAway Kit with Charger and Tester # 20099 on your 1998 48 foot trailer, it should activate the electric brakes. It won't lock up the brakes, but it should quickly and safely add braking pressure to bring the trailer to a stop.
    view full answer...
  • How to Test Trailer Breakaway Switch for Proper Function
    If you are concerned about the performance of your older trailer breakaway kit you can test it by following the process outlined in the linked article. If you find it does not work properly you can replace it completely or just replace select parts. I linked you to a second article that covers installation of such systems and also to our main page for breakaway kits like # 20099.
    view full answer...
  • What is Needed to Stop a Trailer if the Trailer Comes Uncoupled from the Tow Vehicle
    By itself, your brake controller will not stop your trailer if it becomes disconnected from your tow vehicle. Sounds like you are needing a trailer breakaway kit. The Engager Trailer Breakaway Kit with Charger, # 20099, is the product I recommend for your truck and trailer rig. This breakaway kit consists of a battery, a battery box, breakaway switch, and all the needed wiring to install on to your trailer. The kit is designed to activate you trailer brakes by pulling the plunger out...
    view full answer...
  • Trailer Breakaway Kit to Use with Tandem Axle 7,200 Pound Trailer
    Our most popular breakaway kit is the Hopkins Engager # 20099. It works with tandem axle trailers and has a built-in charger with a battery tester. I've linked a review video for you.
    view full answer...
  • Replacement Trailer Breakaway System Cable and Pin
    It sounds like you may be looking for a replacement breakaway cable/pin for your trailer's emergency breakaway kit, such as one like # 20099. On the linked page you will find all replacement breakaway cables/pins. Choose one from the same maker as your breakaway kit.
    view full answer...
  • Troubleshooting 2017 GMC Sierra Breakaway Engaged Causing Error Message In Truck
    On some brake controllers, they will see an error like what you have seen when the breakaway plug is pulled because the breakaway battery sends voltage back up that brake controller wire when it causes the brakes to engage. I recommend disconnecting your truck from your trailer. Disconnecting the battery on your breakaway system then insert the pin and reconnect the breakaway battery. Then connect your truck again. This sometimes will clear the error message. If not, you will need...
    view full answer...
  • Troubleshooting Melted Wires On Breakaway Switch
    Typically, any melted wires are an indication of a short in the wiring. You will need to check the wiring of your breakaway system, and look specifically at the wiring that connects to the battery. Look for any signs of damage or pinched or cut wires and fix as needed. You may find that the wiring between the battery and the switch shorted out on the frame of your trailer causing the problem.
    view full answer...
  • Replacement Breakaway Switch Recommendation for Trailer with Malfunctioning Switch
    Sounds like the breakaway switch has gone bad and is somehow working in reverse. You would want to replace the switch so that when the plug is pulled the brakes lock up and not the opposite or all the time. The part # HM20060 would work well as a replacement.
    view full answer...

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