Push button tester lets you know your break away system is ready to go. Box mounts on the side of the trailer tongue. System is designed to bring a trailer safely to a stop by activating its electric brakes, should it disconnect while you are towing. Lowest Prices for the best trailer breakaway kit from Hopkins. Engager Trailer BreakAway Kit with Charger and Tester part number 20099 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
43.95
4.84164

Price: $43.95

Engager Trailer BreakAway Kit with Charger and Tester

Item # 20099

Our Price: $43.95

Orders above $99 qualify for free shipping

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  • Kit with Charger
  • Hopkins



Hopkins Trailer Breakaway Kit - 20099

Push button tester lets you know your break away system is ready to go. Box mounts on the side of the trailer tongue. System is designed to bring a trailer safely to a stop by activating its electric brakes, should it disconnect while you are towing.


Features:

  • Kit Includes:
    • Built-in battery charger
    • Weather-resistant battery box
    • Sealed 12-volt rechargeable 5-amp-hour battery
    • Charges at 1/2 volt below voltage supplied by towing vehicle
    • Break-Away switch
    • LED tester - shows if battery is good, bad or charging
    • Mounting screws
  • Box can be mounted on trailer jack or trailer frame
  • Works with single and tandem axle trailers
  • Has automatic shut-off when fully charged
    • Green indicator light will remain on even when charge is full
  • Dimensions:
    • 5-5/8" Wide x 5-1/8" Tall x 4-1/8" Deep
  • 1-Year limited warranty


The Breakaway system is designed to bring trailers safely to a stop by activating electric brakes, should a trailer be disconnected while you are driving. This type of safety system is required in most states on trailers rated over 3,000 GVW.


Product detail

LED light glows when battery is charged.

Same as 20119 (brown box)



20099 Hopkins Engager SM Break Away System with LED Battery Monitor (retail packaging)



20099 Installation InstructionsInstallation Details 20099 Installation instructions




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Video of Engager Trailer BreakAway Kit with Charger and Tester


Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.




Video Transcript for Hopkins Trailer Breakaway Kit 20099 Review

Today were going to review part number 20099. This is the Hopkins Engager Trailer Breakaway Kit with the charger and tester. This breakaway system kit is designed to bring trailers safely to a stop by activating its electric trailer brakes on the trailer should that trailer be disconnected while driving. This type of safety system is required in most states on trailers that are rated over 3,000 pounds. This kit does include a built in battery charger in this weather resistant battery box. On the side is a sealed 12-volt rechargeable 5 amp battery.

It does also include this breakaway switch. It has an LED tester, which is included in here. You will see if you push it itll show green for charged. Now if it shows red it would need to be recharged and if it shows yellow that means its charging. It does also include the mounting screws to mount this to the trailer and includes this cable with the pin on the end.

The pin is what would attach into the breakaway switch.Now this box can be mounted on a trailer jack or on the trailer frame. This will work with single axle and tandem axle trailers. This does have an automatic shut off. When fully charged this green indicator light will remain on even when the charge is full. Basically the way you would install this, you would use your three mounting screws and theres the three mounting locations.

This box has three wires coming out of it. The white would need to be attached to a good ground. The black would go to the vehicles battery, and then this blue wire would actually attach to the blue wire on this breakaway switch. Then this other black wire on the breakaway switch would attach to the electric brake wire coming from the trailer side connector. This would actually be mounted closer to the front of the trailer.Basically once thats all wired up what you need to do is insert your pin and push it all the way in and then run your steel cable here up to your tow vehicle and attach it.

What happens in the case of where your trailer might come disconnected it would pull that pin out. When that pin was released from this breakaway switch it would activate current from this battery box to the electric brakes on your trailer, which then would stop the trailer immediately.A few dimensions on this. This box is 5 and 5/8 inches wide. It is 5 and 1/8 inches tall and 4 and 1/8 inch deep. That should do it for the review on part number 20099, the Hopkins Engager Trailer Breakaway Kit with charger and tester.


Customer Reviews

Engager Trailer BreakAway Kit with Charger and Tester - 20099

Average Customer Rating:  4.8 out of 5 stars   (164 Customer Reviews)

Push button tester lets you know your break away system is ready to go. Box mounts on the side of the trailer tongue. System is designed to bring a trailer safely to a stop by activating its electric brakes, should it disconnect while you are towing.


- 20099

by: Mike B.04/14/2010


Excellent product! I got this for Christmas 2009. The kit comes complete with unit and easy-to-follow instructions. I installed it last week (4/10) in about 30 minutes and it worked like a charm (minus a little brake wire issue that had nothing to do with the break-away switch). The charger works off the wiring harness, for those of us who don't have PUP batteries, and a push of the test button shows charge status: Fully Charged, Recharge, or Charging. No guess work involved. The only complaint, albeit a very minor one, was that it only came with three (3) self-taping screws; the main housing unit took 3 on my unit (sometimes two depending on the width of the mount frame) and the switch housing requires one. Additional cost: $0.13 at the local hardware store. Highly recommended!!! 2931



- 20099

by: Schief06/07/2010


Seems adequate Just installed this on our 09 Fleetwood Taos which did not come with a battery. Installation not too difficult, but battery box is too tall to get all three screws on the tongue frame, so just used two and seems sturdy enough. On the camper, I had two wires (a black and a white) coming out of the frame near the 7-wire cable, these had a connector clip at the end. The camper had a breakaway switch that was spliced to these 2 wires. So I followed the wiring diagram and connected the new switch and battery to these wires, instead of splicing into the 7-wire cable. Will do a test, to see if this was right. Wires from battery box are not long enough to mount the battery to frame under the front of the camper and reach the switch near front of the tongue. 3109



- 20099

by: DieselDOC7102/02/2015


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. 172058



- 20099

by: bob ettel09/26/2014


the product description gave me all the info to make an informed decision. The price was by far the lowest I found and shipping cost was very reasonable. And I also appreciate the follow up. I would highly recommend your company. Thanks!!! 153279


Comments

Still working fine

bob e - 09/26/2015

15236



- 20099

by: Bryon05/14/2011


Got my breakaway kit in 2 days. It took 2 Hrs to install...works 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. 13925



- 20099

by: Gary W.09/10/2015


Very good product. Easy to follow instructions with all necessary hardware included. This is my second unit--have had one installed on another trailer for over 12 years now--still works great! 224784


Comments

Still working great!

Gary W - 09/09/2016

20861



- 20099

by: Tim P.04/09/2011


Pros: Sturdy enclosure, test button, break-away switch comes with 2 pins (handy when somebody drives off with your break-away cable) Cons: Conductors battery enclosure without any jacket/loom, conductors not protected from chaffing where they exit the plastic battery enclosure, conductors leaving battery box are short (18"), no strain relief of conductors exiting battery box (only thing holding them in the box is the solder connection to the charger pcb). Self-tapping screws don't appear corrosion resistant. Not sure if there is a higher quality product available. While this will get the job done, I wasn't impressed. 11407



- 20099

by: Ben R.10/12/2016


Bought this kit last year to replace the original unit on my car hauler that was simply a battery in a box. This unit wired in with very little effort. I especially like the indicator lights that show you the status of the battery when plugged into the truck and the test button is a great feature when it's just sitting. So far this unit is great and I hope that I never have to find out if it actually works...cause that would mean I lost the trailer! But I have a feeling if that ever occurs, I'm confident this unit will fiction as it should and bring the trailer to a stop! Highly recommend. 305880



- 20099

by: George04/15/2014


Great item, installs easy and works gre at. 125127


Comments

Just as stated from company, great

George - 05/05/2015

11375



- 20099

by: Gary02/11/2013


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 etrailer.com in the past, and I am glad that I returned. 65762


Comments

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


2814

- 20099

by: Jean W.10/11/2015


Fast and easy. Will be back again. 229733


Comments

Still working great

Jean W - 10/10/2016

21482



- 20099

by: MrDually02/23/2015


I own several trailers with electric brakes on two axles with this kit. All have lasted for many years. Indicator light is very handy for an easy check especially if I don't use the trailer very often. Easy to wire in to an existing system. Most all new trucks come with a battery lead to the factory connector that keeps this battery charged. Just need to make sure to have a 6 or 7 pin plug to the trailer. 175816



- 20099

by: Rick S.09/18/2012


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. 55074



- 20099

by: Tim M06/18/2012


The easiest, most courteous, prompt people to do business with. I have already told anyone that would listen how accommodating etrailer is. I was pleased my shipping was free but couldn’t believe it when they emailed me and told me they upgraded my delivery with no additional charges. I had everything delivered in one box in 3 days and all parts were excactly correct and worked perfectly. 44638



- 20099

by: Doug F.02/26/2017


I bought the Hopkins Breakaway kit to replace the one that came with the trailer which was exactly the same. The reason it needed replacement was because a heavy object was dropped on it and the case broke. This was no fault of the Breakaway by Hopkins. E Trailer is a great company to work with! UI have always had good products and fast shipping from E Trailer! Doug 346137



- 20099

by: Bob W04/16/2017


This is the 2nd Engager BreakAway kit I have purchased. It is a well made item and has functioned well. I am only replacing it because the battery is getting old and I want to just replace the whole thing, which will take less than an hour. It arrived quickly from etrailer and in good condition. 368231


Comments

We love to hear stories about customers that are so pleased with our products that they come back to us when it is time replace it. Thanks for taking the time to review and rate the 20099 BreakAway Kit, Bob !!

Hopkins C from - 04/20/2017

23251



- 20099

by: Performance Irrigation01/31/2013


The verdict is still out on this unit, but it is what comes on all of the trailers we have purchased even the brand new one we just recieved. We do have some issues with the LED staying on after detaching the truck from the trailer, but hopefully a new unit will take care of it this time. 64716



- 20099

by: Darren T.03/15/2017


Luckily haven't needed to test in breakaway situation but works very well otherwise! I also have it wired up to charge my winch battery on the trailer, works like a charm! Great products and service from etrailer, they will be my 1st choice next time I need trailer parts. 352996



- 20099

by: Justin12/16/2010


great product, better service Very nicely packaged, plastic case appears to be very durable with sturdy mounting tabs, entire assembly is very compact and easy to mount. All hardware is included. Installation instructions are clear, complete, and easy to understand. 4212



- 20099

by: Scott W.06/04/2013


Exactly what was described. The product was manufactured well and very easy to install. The information provided was easy to decipher and used the wiring harness diagram for easy install. I never go just color wire to color wire so wiring by function was easy. 83327



- 20099

by: Rick Fitz06/07/2015


So far so good but the door or lid that seals the battery and the electronic charger does not fit tight and if mounted out in the open rain WILL get in it. This was not an expensive unit so I cant beat it up to much but keeping electronic dry is a basic. 201424



- 20099

by: Ricky M10/22/2011


The kit has all the components you need to complete the breakaway system for your trailer with electric brakes. I conjunction with a junction box (Item 38656 or similar), I rewired the front of my trailer with a very neat, clean, and serviceable system. 25967



- 20099

by: MReeves08/19/2014


Product was exactly what I expected... Insulation was a breeze with the great directions included... Used this to replace the old kit on my 32' enclosed race car trailer... Recommend this product to anyone that is need of a new break away kit..... 147491



- 20099

by: Jake12/23/2016


This engager product is perfect! It's an easy install and very reliable. The LED lights are a nice feature. Also you can't say enough about etrailer's customer service. They are a great company, have great service, and care about their customers! 327525



- 20099

by: Brian02/26/2011


Breakaway kit is easy to mount and connect. Very clear instructions. Good value for the money. The folks at etrailer.com are great. Very nice website, easy search, loads of products, great support and fast shipping with standard UPS. Thanks. 7945



- 20099

by: larry fraser05/25/2011


this type of installation is not only easy but will help when my clients get pulled over for any reason by a traffic officer who wants to check his trailer. They can at a glance see the battery is good. We have installed 7 of these so far. 15390



- 20099

by: Access Const.03/17/2011


2nd time purchasing from E-trailer, 1st time for this product, always easy to order, aways prompt delivery, and always ready to help you. Product is what I expected in great shape when delivered. Have not given it the test drive yet. 9589



- 20099

by: Jimmy J.11/18/2014


Product arrived a day earlier than expected (Happy) So far the service from E-trailer has been excellent.... One of the best vendor web sites I have ever visited...keep up the good work...I'll be back 161662



- 20099

by: Travis06/25/2013


Easy to install! Works perfectly and was a great safety addition to my 16ft trailer. Would definitely recommend this product to anyone with a large trailer that's used regularly for heavy loads. 85971



- 20099

by: J.R.07/27/2013


I wired this break away to a dual axle trailer. Very simple and straight forward job to do. It works great. Still holding a charge after weeks of not using. I would definitely buy this again. 91867



- 20099

by: Wayne P.04/21/2014


The unit currently on the trailer needed a new battery and some repair to box itself from sun and usage, it was almost the same price to replace the entire unit as fix, plus saved time for me. 126323



- 20099

by: Mitchell Davis01/30/2012


When I got the break away kit when it was delivered to my house I started installing it an it was a ease to hook up an I been working great for 2 years on my trailer thanks alot once again 30525



- 20099

by: Ryan S08/22/2016


This was really simple to install. It is a great product I love the test button to tell you if it's charged. And I really like the light that tells you the battery is being charged. 286432



- 20099

by: DAVE Z05/02/2012


The Engager breakaway kit is an excellent product, easy to install with good wiring diagrams. E Trailer had a good priced and shipped very quickly. Good customer service. 39217



- 20099

by: Fred F12/24/2011


Very quick delivery, excellent communications, they went the extra mile to get me the products I ordered in the time frame I had. Thank You and Merry Christmas 28679



- 20099

by: Robert01/02/2012


Product was shipped only a day after I ordered it and was delvered within just a few days, product was easy to install and seems to be a really great item. 28993



- 20099

by: Ed H.05/28/2014


Product exactly as expected, shipped immediately, and delivered quickly via standard shipping. I would certainly make future purchases via trailer. 133060



- 20099

by: Mark05/04/2016


Fast service,new unit fit right in place of old unit. Didn`t even have to drill new hole`s for base.Battery is already charged,make`s it nice. 248367



- 20099

by: Karl Hoult12/05/2013


Received everything as I ordered. Great price and fast shipping. 5 minute install of the brake control with the wiring adapter for my truck. 109312



- 20099

by: Don W01/15/2013


Exact replacement for kit that came on my 2007 Sundowner. Fairly easy install, except for the rivets Sundowner used on the factory install. 63084



- 20099

by: Steve G.01/04/2013


The product was exactly what I was looking for. I recieved it in 3 days with a holiday in-between the service was great and pricing was fair. 62447



- 20099

by: big d03/28/2011


fast ship, quality product, company checked on my satisfaction. this company gets an A in my book for customer service and a quality product. 10523



- 20099

by: Lin A.02/09/2017


The product arrived very quickly and was exactly what it should be. I am very satisfied with etrailer as far as price and shipping. 340175



- 20099

by: James03/10/2016


It was easy to put on, and fortunately I have not tested it in real life but do feel confident it would do the job if called upon. 240453



- 20099

by: Paul R.06/22/2016


Great idea. We have one on another trailer. Nice to be able to tell if your break away battery is still in working condition. 263915



- 20099

by: bob k06/03/2014


Great Breakaway kit , I have used them before and this is the most complete ,easy to install kit . Would recommend them highly. 133948



- 20099

by: Edward H.12/13/2012


The product that was received is as described in web site. E-Trailer was quick to respond in shipping item to the adddress. 61321



- 20099

by: Andrew MacDonald02/23/2011


Does what it says, website has extremely helpful information and the product shipped immediately with clear instructions. 7737



- 20099

by: Diana01/21/2013


So far so good. I had my brother-in-law install it on my older Circle J horse trailer. He mounted it in the tackroom. 63704



- 20099

by: TK09/09/2016


A pretty good product, and at a very reasonable price. We have them on all of our trailers, and they work very well. 292679

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Show More Reviews


Ask the Experts about this Hopkins Trailer Breakaway Kit
Do you have a question about this Trailer Breakaway Kit?


  • How to Release the Brakes on a Trailer Once the Break Away Switch Is Activated
  • If you still have the plunger end that goes in the break away switch, then you can simply insert the plunger back into the switch and that should cut off the power to the brakes on your trailer. If you no longer have the plunger, then you can either remove the break away battery or cut one of the wires going to or from the break away switch. One wire is coming from the break away battery and the other is going to the brake circuit on the trailer. Cutting one of those wires will terminate...
    view full answer...

  • Charging a Trailer Breakaway System Battery Using the 12 Volt Circuit on a 7-Way Connector
  • To charge the battery in the Engager Trailer BreakAway Kit, # 20099, you can attach the wire from the 12 volt circuit on the trailer side 7-Way (1 oclock position on the back of the trailer side 7-Way where the wires attach) to the input wire on the trailer breakaway system. This system has a charger built in to it. As long as it is connected to a function 12 volt circuit it will charge the battery. When connected to the towing vehicle and the vehicle on and/or running, the 12 volt circuit...
    view full answer...

  • Recommended Electric Over Hydraulic Trailer Brake Conversion for Dual 10K Axles
  • The Disc Brake Kit # K2R1058D13 by Kodiak is the brake set that you will need to use for your 10,000 lb Dexter Torsion axles. When it comes to hardware, like the brake line, I recommend going with the Kodiak Hydraulic Brake Line Kit # 24TA-BLKIT which will wear better than other traditional brands. These lines are very flexible so the line is easy to maneuver under the trailer. The only downfall is that you cannot cut the line due to how hard and risky it is to do yourself. All you have...
    view full answer...

  • Wiring Diagram for the Curt 4 Pole to 7 Pole Adapter # C57674 And Wiring for Trailer Brakes
  • The wiring for the Adapter 4 Pole to 7 Pole and 4 Pole, item # C57674, is wired as follows. The white wire is grounded to the vehicle frame as you have indicated. The Yellow wire is the center pole of the 7-Way connector and is normally used for connection to the reverse light circuit. In your case you will not need the yellow wire. The blue wire is for connection of the electric brake feed wire from a brake controller. You will need a brake controller in your Sienna to activate the...
    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 a Trailer Break Away Battery be Charged from the 7-Way Trailer Connector
  • If you have a break away kit that does not include a charger, you can provide a charge to the battery using the 12 volt circuit or auxiliary circuit from the vehicle 7-Way trailer connector. However, using the 7-Way can overcharge a break away battery. It would better to add a charger designed for a break away battery like # 20011.
    view full answer...

  • Parts Needed For Converting 5th Wheel Trailer With Tandem Axles To Disc Brakes
  • We have just what you need to convert to disc brakes on your fifth wheel trailer. First, I recommend the Kodiak Disc Brake Kit, part # K2HR526D. This is for one axle so for a tandem trailer you will need to order 2 kits. This kit has a 6 on 5-1/2 bolt pattern. The inner bearing has a 1.750 inner diameter and the outer bearing has an inner diameter of 1.250 inches. For a brake line kit I recommend part # HS496-152 for a 15-ft kit, and part # HS496-252 for a 25-ft kit. These are designed...
    view full answer...

  • Does the Engager Trailer BreakAway Kit with Charger and Tester, # 20099 Come with Instructions
  • Yes, the Engager Trailer BreakAway Kit with Charger and Tester, # 20099, does come with instructions, which I have linked for you. There is also a wiring color code on the box lid. If you look at the second picture on the product page you will see the color code information. The more detailed wiring instructions found in the manual for the kit are as follows: 1. Splice one blue wire of the Break-Away Switch to the electric brake wire coming from the trailer side connector. 2. Connect...
    view full answer...

  • Parts Needed to Add Electric Drum Brakes to Trailer with 3500-lb Axle
  • A great place to start for your trailer brake project is the linked article that covers the entire process of adding electric drum brakes to a trailer. For a set of electric drum brakes for your Top Hat trailer that has a 3500-lb axle and 15-inch wheels you can use the etrailer Electric Trailer Brake Kit # AKEBRK-35-SA. This kit includes both left- and right-hand brakes that use a 4-bolt mounting pattern. With these you will need matching 10 x 2-1/4-inch hub/drums to complete the set-up. We...
    view full answer...

  • How to Wire Up a Breakaway Battery and an Auxiliary Battery on a Trailer without Backfeeding
  • It sounds like the tilt battery is backfeeding onto the breakaway battery charge line so as long as the ground is connecting it is taking a charge from the tilt battery and that is why your charge light is staying on. I have a solution for you, you will need a single function diode part # RM-690. You will need to wire it in between the breakaway battery and the tilt battery and it will stop the backfeeding from your tilt battery to the rest of the 12 volt circuit wiring of your trailer. Check...
    view full answer...

  • How Long Will the Engager Trailer Breakaway Kit Battery Last Without a Charge
  • Battery life depends on so many factors that it is hard to quantify the life any given battery. I spoke with my contact at Hopkins and he stated that if the battery is stored outside he estimates a 3 to 6 month life span. If stored inside it will last a little longer and will most likely make it to 6 months. If the battery is not being charged via the 7-Way trailer connector regularly then it is recommended to charge the battery every 3 months using a battery charger like # CTEK56158. If...
    view full answer...

  • Replacement Trailer Battery Box Recommendation
  • If all you need is a replacement battery box you could get a Replacement Box with Non-LED Lid for Engager Breakaway Kit, part # HM20120. You may also be interested in purchasing a Hopkins Replacement LED Lid for #20099, part # 20106, if you would like an easy way of knowing the condition of the charge on your trailer battery.
    view full answer...

  • If Breakaway Switch on Trailer is Left Unplugged with Battery Drain
  • If the battery you disconnected from your trailer is also the battery that powers the breakaway system then having the pin pulled on the switch won't be an issue. If you left the breakaway battery installed on the trailer then the pin being pulled will drain the battery. If the battery stays totally dead for a few months it would need to be replaced most likely. We have three replacement breakaway batteries. We have the Curt part # C52023, the Hopkins part # HM20008, and the Tekonsha...
    view full answer...

  • Troubleshooting Hopkins Trailer Breakaway System Not Charging Battery
  • First you will want to check the wiring of the Hopking Breakaway # 20099. If the black wire from the breakaway box is not receiving 12 volts from the 7-way on your tow vehicle it will charge the battery. You will want to use a circuit tester like part # 3808 to test this wire for 12 volts when the vehicle is connected and running. If there is no voltage there then you will need to trace this wire back to where it connects to your vehicle wiring and make sure it is connected securely...
    view full answer...

  • Wiring a Trailer Breakaway Kit on a Bigfoot Travel Trailer
  • In order for a break away system to power electric trailer brakes, it will need a 12 volt power source (a battery mounted on the trailer). The battery has to provide a full 15 minutes of braking power to comply with DOT regulations. On the trailer connector there is a wire that goes back to the trailer brakes. This wire may be black or blue depending on the specific system. Attach one wire from the switch to the wire that goes to the trailer brakes. There should be another wire, usually...
    view full answer...

  • The Charge Light for Engager Trailer BreakAway Kit Stays On All the Time
  • The fact that it is staying on even when the trailer is not connected is strange. According to the installation details linked for reference, if the trailer is connected to the tow vehicle, the yellow charging light will always be on. The light stays on just to show that the unit is connected and has power. Since it is staying on, it has to be drawing power from the break away battery. The box is water resistant but not water proof. Moisture or corrosion build up in the box or wiring...
    view full answer...

  • What are the Functions of the 3 Wires on Hopkins LED Breakaway Switch, # HM20059
  • You are correct, the Hopkins LED Breakaway Switch, # HM20059, does have 3 wires. The white wire is the ground wire and should be attached to the trailer frame. The blue wire on the switch will connect to the electric brake wire coming from the trailer side connector. The black wire goes to the break away battery. This part is just a switch, if you need a new system, I recommend Engager Trailer BreakAway Kit with Charger and Tester, # 20099. I have included a link to the installation details...
    view full answer...

  • Troubleshooting Confusing LED Lights on a Hopkins Engager Trailer Breakaway Kit
  • It sounds like you might have one or two situations going on there. First, use the installation instructions, linked here for you, and make sure the breakaway kit is wired correctly. Also, check to be sure the plastic breakaway switch pin is correctly inserted into the breakaway switch housing. Next, make sure that the ground wire from the breakaway kit, # 20401, is attached to the trailer frame and not wired into the trailer connector. My contact at Hopkins indicated that this could...
    view full answer...

  • Parts Needed to Add Electric Drum Brakes to a Trailer
  • It sounds like you have bearings # L68149, that measures 1.378 inches, and # L44649, which measures 1.063 inches. If so the hub and drum assembly # AKHD-655-35-K will fit your axle. This kit also includes the races and seal. It's for 3,500 pound axles and has a 6 on 5-1/2 bolt pattern. With a 3,500 pound axle you'll need brake flanges with a 4-bolt pattern like # 4-35. Your trailer may already have these and if so that's good. The brake flange needs to be welded to the end of the...
    view full answer...

  • Replacement Battery for Hopkins Engager Trailer Break Away System
  • Yes, replacement breakaway kit battery # HM20008 is the correct replacement for the Hopkins Engager system # 20099. Its also the only replacement battery Hopkins offers.
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  • Parts Needed to Add Electric Brakes to 6 x 14 Cargo Trailer with a 3,500 Pound Axle
  • The brakes I suggest for your 3,500 pound axle are the self-adjusting # AKEBRK-35-SA assemblies. Since they're self-adjusting you need to do an adjustment when you install them but that's it. The hub and drum assembly to match your bearings and bolt pattern is # AKHD-545-35-EZ-K. This includes new bearings, races, grease seal, grease cap, and lug nuts. For the 7-way trailer connector I like # 277-000141. It's attached to a junction box to make wiring everything easier. You'll also...
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  • Can a Breakaway System Battery Charger Charge a Car Battery to Power a Trailer Mounted Winch
  • There are a couple of different things going on. First, a 12 volt circuit from a trailer connector will not be able to charge a battery, it will only be able to provide a maintenance charge, maintaining the charge level of the battery but not adding anything to it. While it may be sufficient for smaller breakaway batteries, it will not be sufficient for a 12 volt automotive or deep cycle battery. I recommend using a dedicated battery for the breakaway system, like the Engager Trailer...
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  • The Electric Brakes on a Tandem Axle Gooseneck Trailer Work but Not Well
  • It sounds like you have done quite a bit of troubleshooting already. Before we dive any deeper, I would recommend checking all of the ground connections for the brake assemblies. Make sure each brake assembly is grounded to a clean bare surface on the trailer frame. A weak ground connection on any of the assemblies can cause problems. I would also test the electric brake wire to make sure you are getting full voltage to the brake magnets. Your brake controller should be putting out about...
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  • Parts Needed to Add Electric Brakes to Trailer with 3,500 Pound Axles
  • To answer your last question first the trailer has been towed with no brakes so even if you only add brakes to one axle it will be an improvement. Based on your measurements I'm thinking your inner bearings are # L68149 (1.378 inch diameter) and outer bearings are # L44649 (1.063 inch diameter). Very close to what you have but you'll want to double check like you mentioned. If these bearings are correct the hub and drum assembly for your trailer is # AKHD-545-35-K. If they're not...
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  • Recommended Disc Brake Conversion on 10,000 lb AL-KO Axle
  • I reached out to Dexter Axle and spoke directly with their AL-KO/Hayes specialist. They said that there is not a conversion to disk brakes for their axle based on the axle itself. The issue is with the mount for the brake calipers. If you can fabricate mounts, I can give you everything else that will make your trailer compatible. I recommend the Redline Trailer Hub Assembly - 10,000 lbs Axles - 8 on 6-1/2, # 090814. These are compatible with your axle. This hub includes the races,...
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  • Availability of Replacement Battery for Hopkins/TAP Engager Trailer Break Away System
  • We do indeed offer a 12-Volt, 5 aH replacement battery for your Hopkins/TAP Engager trailer break away system. The battery is part # HM20008.
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  • Charging Light Stays on with the Vehicle Off and Trailer Connected on BreakAway Kit # 20099
  • According to the installation details linked below, if the trailer is connected to the tow vehicle, the yellow charging light will always be on. I spoke with my contact at Hopkins and he stated that the Engager Trailer BreakAway Kit with Charger and Tester, # 20099, has its own system that monitors when it is receiving power and will not draw power with the vehicle off. It will not drain the tow vehicle battery or overcharge the break away battery. The light stays on just to show that the...
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  • Do Your Breakaway Kits Meet DOT Requirements
  • Yes all of our breakaway kits meet DOT requirements.
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  • How to Wire Up a Breakaway Battery and an Auxiliary Battery on a Trailer without Backfeeding
  • It sounds like the house battery is backfeeding onto the breakaway battery charge line so as long as the ground is connecting it is taking a charge from the tilt battery and that is why your charge light is staying on. I have a solution for you, you will need a single function diode part # RM-690. You will need to wire it in between the breakaway battery and the tilt battery and it will stop the backfeeding from your tilt battery to the rest of the 12 volt circuit wiring of your trailer. Check...
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  • Trailer Breakaway System Not Locking Trailer Brakes when Pin is Pulled
  • It sounds like something is miswired or there is a loose connection or poor ground somewhere. On the Engager the brake output wire from the trailer connector will go to a blue wire on the breakaway switch. You will just be tapping into this wire, the original wire still goes back to the trailer brakes. The other wire on the switch will connect to the blue wire from the box with the battery in it. The white wire on the box will ground to the ground wire from the wiring harness and/or...
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Information for this part was:

Installed by:
Joe V
Expert Research:
Michael L
Video Edited:
Zack K
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
John H
Updated by:
Adele M
Expert Research:
Adam R
Updated by:
Laura H
Photos by:
Jim W
Expert Research:
Lori W
Photos by:
Amber A
Expert Research:
Jeffrey L
Updated by:
Sarah W
Photos by:
Stacy F

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Info for this part was:


Installed by:
Joe V

Expert Research:
Michael L

Video Edited:
Zack K

Expert Research:
Robert G

Expert Research:
Michael H

Expert Research:
Jeff D

Expert Research:
Reno H

Expert Research:
Jameson C

Expert Research:
John H

Updated by:
Adele M

Expert Research:
Adam R

Updated by:
Laura H

Photos by:
Jim W

Expert Research:
Lori W

Photos by:
Amber A

Expert Research:
Jeffrey L

Updated by:
Sarah W

Photos by:
Stacy F

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.




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