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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

Item # 20099
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 - 20099

  • 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


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   (641 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!


Worked as advertised. Better case to seal out the weather


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.


Easy installation at a fare price


all good, great 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.


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


Great customer service and website


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


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.


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.


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!


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.


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.


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.


Battery is dead

Etrailer Expert

Jenny N.


Oh no! This is not common with this breakaway kit. I will have our Customer Service team reach out to you.

Show More Reviews

See what our Experts say about this Hopkins Trailer Breakaway Kit

  • 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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  • How to Reset Breakaway Kit When Pin is Pulled
    If you pulled the pin on a breakaway kit, like the Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20099, you should be able to just insert the pin back into place and your breakaway battery will stop applying the brakes on your trailer. If you don't already have a breakaway battery kit that has a recharging battery that stores power when connected to your tow vehicle then you can use the Hopkins kit that I mentioned above.
    view full answer...
  • Repair and Testing of Hopkins Trailer Breakaway Kit
    If you found a broken solder joint and disconnected wire inside your trailer breakaway battery box like # 20099 and you are sure of where the loose wire connects, then yes, you should be fine soldering the wire back into place on the circuit board. After you make this repair and allow the battery to fully re-charge I suggest disconnecting the trailer connector from the vehicle and testing the breakaway system's operation. Some help articles on these kits and how to test them are linked for you.
    view full answer...
  • Troubleshooting Brake Controller that Says It's Not Connected to Trailer
    This is a fairly common problem that is almost always due to corrosion on the trailer connectors. Check both the connector on the tow vehicle and on the trailer for corrosion and/or a bent pin and fix as needed. I attached a help article on troubleshooting brake controllers for you to check out as well.
    view full answer...
  • Why Does Battery for Trailer Jack Keep Dying
    The breakaway battery would usually be maintained from the 12-volt circuit coming off the 7-way trailer connector. You can test the battery with a volt meter to see if it's still good. It's unlikely that the breakaway battery would deplete the battery for the trailer jack. It's not unusual that you need to recharge the battery for the jack every once in awhile, because the power wire form the 7-way does NOT have enough grunt to recharge the battery once it's depleted. It can maintain a...
    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...
  • 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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  • 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...
  • Where Does Trailer Breakaway System Attach To
    The breakaway switch cable needs to be secured to the vehicle bumper or frame. The cable can be attached in many different ways. The most common method is: Remove the cable pin from the breakaway switch. Wrap it around the safety chain loop and then back through the loop of the cable to basically make a slip knot around the safety chain loop.
    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...
  • Is the Engager Trailer BreakAway Kit with Charger and Tester part # 20099 Waterproof
    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 FAQ...
    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...
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  • Troubleshooting Electric Brakes Locked Up With Breakaway Battery Disconnected
    The battery in a standard breakaway kit like the Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20099 is designed to lock up the trailer brakes for 15 minutes once the pin is pulled. The only way that the battery would still be able to power your trailer brakes when you disconnect it is if you disconnected it from the end that it receives power and not from the end that would be sending the power to your brakes. It is definitely possible for the battery to get messed up but if you...
    view full answer...
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  • Why Do Trailer Breakaway Kits Have Their Own Battery
    It's always a good idea to use a dedicated power supply for the breakaway switch since you would be covered if the main trailer battery were to go dead. There are also some states that require the power source for the breakaway switch to be separate from the main trailer battery. The Hopkins Engager Push-To-Test Trailer Breakaway Kit part # 20099 will be an excellent option for this system.
    view full answer...
  • Why It's Not Recommended to Use Dump Trailer Battery for Trailer Breakaway
    It's not recommended to use a battery that powers the dump feature of your trailer for the breakaway battery since that battery could be drained when you'd need the breakaway. Legally also you have to use a breakaway battery setup like the Hopkins # 20099 which comes with a dedicated battery.
    view full answer...
  • Can Trailer's Breakaway Battery Switch Have Power From Battery and Trailer Wiring Ran to It
    Unlike AC power DC power can have two power sources ran to the same thing like you described without issue.
    view full answer...
  • How Does the Engager Breakaway System # 20099 Install
    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...
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  • Troubleshooting Trailer Brakes Locking Up When Brakes Are Applied
    The lock up issue you are having shouldn't be related to the Engager Breakaway System part # 20099 that you have installed on your trailer. There are other factors to consider when dealing with trailer brakes that lock up. You either have the gain set too high on your brake controller or there is a short from the stoplight circuit to the brake output circuit and the brake assemblies are getting a full 12 volts everytime you step on the brakes. Typically corrosion in the trailer connector...
    view full answer...
  • Is 12V Battery Included in Hopkins Engager Trailer Breakaway Kit with Charger and Tester 20099
    Yes, the Engager Trailer BreakAway Kit with Charger and Tester # 20099 does include the breakaway battery. This kit includes the battery, a built-in automatic charger, the weather-resistant box, the breakaway switch and mounting hardware. I linked two videos for you; one is a review video showing what is included in the kit and the other is an installation video.
    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.
    view full answer...
  • 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...
  • 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...
    view full answer...

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