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Roadmaster Brake-Lite Relay Kit for Towed Vehicles

Roadmaster Brake-Lite Relay Kit for Towed Vehicles

Item # RM-88400
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Roadmaster Tow Bar Braking Systems - RM-88400
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Relay works with your tow bar wiring system to ensure that your towed vehicle's turn signal lights flash in tandem with your RV's lights. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster Brake-Lite Relay Kit for Towed Vehicles part number RM-88400 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Roadmaster Tow Bar Braking Systems - RM-88400

  • Roadmaster
  • Brake Light Relay

Relay works with your tow bar wiring system to ensure that your towed vehicle's turn signal lights flash in tandem with your RV's lights.


Features:

  • Keeps your towed car's brake signal from overriding the turn signal sent by your RV
    • Allows signal lights on towed car to flash in tandem with RV lights even when vehicle's brake pedal is depressed
  • Required on towed cars with combined lighting if you are using a supplemental braking system
    • Needed on applications with separate lighting if towed car is wired using a TrailerMate wiring harness or a 4-diode kit (instead of a 6-diode kit)
  • Does not interfere with towed car's electrical system
  • Activates automatically when RV running lights are turned on
  • Includes all necessary components for standard installation
    • May require additional connectors and length of wire for certain applications
  • Limited Lifetime Warranty


The purpose of a brake light relay kit is to prevent your towed car's brake signal from overriding the turn signal that comes from your RV. When your towed vehicle is properly wired and connected to your RV, its indicator lights will illuminate as you engage the turn signals in your RV. However, if you have only a four-diode system in place, the turn signal will be overridden by your towed car's brake signal as soon as your supplemental braking system presses the towed car's brake pedal. As a result, drivers behind you know only that you're slowing down and not that you are turning.


Installing a brake light relay in your towed vehicle fixes this problem by ensuring that your car's brake signal does not override the RV's turn signal. Therefore, your towed car's lights will function in accordance with your RV at all times.


Is a Relay Required?

To determine if a brake light relay is needed to properly wire your vehicle to be towed, answer the following questions.


Are you using a supplemental braking system that depresses the brake pedal in your towed car?

No - You do not need a brake light relay.

Yes - You may need a brake light relay. Continue on to the next question.


Do the brake lights on your towed car illuminate while the engine is off?

No - You do not need a brake light relay.

Yes - You may need a brake light relay. Continue on to the next question.


Do your towed car's brake lights act as both the brake signals and the turn signals?

No - You may need a brake light relay. Continue on to the next question.

Yes - Your towed car has a combined lighting system. You will need a brake light relay to ensure proper activation of its signal lights.


Does your towed car have separate brake lights and turn signals?

No - Your towed car has a combined lighting system. You will need a brake light relay.

Yes - Your towed car has a separate lighting system. You may need a brake light relay. Continue on to the next question.


Are you wiring your vehicle with a six-diode kit or a TowDaddy custom wiring harness?

No - You will need a brake light relay to ensure proper activation of your towed car's signal lights.

Yes - You do not need a brake light relay.


Installation of the Roadmaster Brake-Lite Relay

Most towed cars require the normally open installation method. Ford and Lincoln models with neutral tow kits and most automobiles that have a push-button start function will require the normally closed installation.


Normally Open

The diagram and steps shown below demonstrate the installation for normally open applications. Be sure to follow the instructions included with your relay kit for a more detailed process.


Standard Normally Open Installation for Roadmaster Brake-Lite Relay
  1. Remove the blue wire from the kit. This wire is not needed for normally open applications.
  2. Locate the brake-light-switch wire in your towed car.
  3. Remove the brake light fuse.
  4. Cut the brake light wire a few inches away from the "cold" side of the brake light switch.
  5. Attach the relay to the wiring for the RV braking monitor. The diagram above shows where the green wire attaches the relay to either a Roadmaster Even Brake or BrakeMaster system.
  6. Connect the black wire of the relay to the brake light wire near the brake light itself using the included blue butt connector.
  7. Identify a fuse that is only powered when the ignition is in the "run" position and not when it is in the "tow" position. Pull the fuse. Insert the fuse into the slot closest to the fuse blades, then insert the fuse tap into the empty slot in the fuse panel.
  8. Using the attached blue butt connector, connect the red wire from the brake relay to the wire from the fuse tap.
  9. Ground the white wire to your towed vehicle's frame.
  10. Secure the relay with the included wire ties.

Normally Closed

The diagram and steps shown below demonstrate the installation for normally closed applications. If you have a Ford or Lincoln that has a neutral tow kit or if your car has a push-button start feature that will not start the engine when the brake fuse is removed, then you need to perform a normally closed installation. Be sure to follow the instructions included with your relay kit for a more detailed process. Normally closed operations may require additional connectors and length of wire that are not included with this kit.


Normally Closed Installation for Roadmaster Brake-Lite Relay
  1. Remove the green wire from the kit. If you are using a Roadmaster Even Brake supplemental braking system, set this wire aside to use later.
  2. Locate the brake-light-switch wire in your towed car.
  3. Remove the brake light fuse.
  4. Cut the brake light wire a few inches away from the "cold" side of the brake light switch.
  5. Attach the relay to the wiring for the RV braking monitor. The diagram above shows where the blue wire attaches the relay to either a Roadmaster Even Brake or BrakeMaster system. The green wire may be needed here.
  6. Connect the black wire of the relay to the brake light wire near the brake light itself using the included blue butt connector.
  7. Use a voltmeter to identify the wire in your aftermarket light harness that is conducting the tail light signal. Typically, this is a brown wire.
  8. Using a 16 - 14 gauge butt connector (sold separately), attach a section of 14-gauge wire (sold separately) to the end of the red wire. Trim the new 14-gauge wire and connect it to your aftermarket wiring harness.
  9. Start your engine and turn on your headlights. Test the tail light wire with a voltmeter. If your voltmeter doesn't register any voltage, move on to step 10. If 12V DC registers, you will need to install a single diode (RM-790; sold separately).
  10. Ground the white wire to your towed car's frame.
  11. Secure the relay with the included wire ties.


88400 Road Master Brake Light Relay

Installation Details RM-88400 Installation instructions




Customer Reviews

Roadmaster Brake-Lite Relay Kit for Towed Vehicles - RM-88400

Average Customer Rating:  4.7 out of 5 stars   (138 Customer Reviews)

Relay works with your tow bar wiring system to ensure that your towed vehicle's turn signal lights flash in tandem with your RV's lights.

- RM-88400
by:

917452



- RM-88400
by:

You guys rock!!!! Great work 915861



- RM-88400
by:

what can I say, it's under the dash 909313



- RM-88400
by:

Good product. eTrailer’s install video was spot on! 906930



- RM-88400
by:

Have a issue with 2016 Wrangler. Before install the brake light works anytime, even without key. After install the brake lights only work in the On/Run position (not in Accessory position). I use the Even Brake system which requires a brake signal, thus I have to set the ignition switch to On when I am towing which means the odometer will count the miles and who knows what could be damaged by leaving the ignition switch turned to On for several hours. This relay does exactly what it says, but I would prefer that it work in the Accessory position which is what is recommended in the Jeep manual for towing. 904244



- RM-88400
by:

Easy install. The only hard part is getting both hands under the dash and while laying on your back. 903889



- RM-88400
by:

Installation went well, instructions were good. etrailer's installation video helped a lot. Works as described. Installed on a 2019 Ford F150. Needed the micro dual fuse tap to complete. 895736



- RM-88400
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The kit was delivered on time and my mechanic said everything looks good. Noah from etrailer was super nice to work with and gave me confidence in the purchasing experience. I will do business with etrailer in the future! 899315



- RM-88400
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I love the quality of the products I ordered. Customer relations was very good as well, they kept me informed and even though it took several weeks and etrailer had to wait on items to get to them, I was communicated to well. I know it’s important in who you deal within this day and time and you can trust etrailer. 899231



- RM-88400
by:

Works as expected. Fairly easy install. 893015



- RM-88400
by:

This review is for E-Trailer. I ordered a complete dinghy towing set-up for the dinghy as a towbar came with the RV we purchased. I called E-Trailer and spoke with a very knowledgeable young lady and when I told her what I needed in layman’s terms she came up with what I would need to complete the dinghy preparation in order to safely tow it behind our RV. Everything they said it would do went just as the instructions directed. I ordered a Roadmaster Falcon 2 set up for the dinghy and they suggested a Blue Ox self contained braking system for the SUV itself. hey also suggested the complete wiring system and plug for the dinghy. To my amazement after the RV and dinghy were connected that also was as easy as they said it would be. Our first tow with the dinghy was great and the unhooking was also a very easy experience. This company was awesome to work with. Thank you for your knowledge and great products. 893190



- RM-88400
by:

Not too difficult to install in a Jeep Wrangler JK. The videos were almost necessary for me. The relay works as advertised. Makes sure to remove the fuse(s) associated with the brake lights. 874669



- RM-88400
by:

Fast delivery. You tube videos were very very helpful. 872058



- RM-88400
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Product recommendations said I needed this for my Jeep JL (2019) to go along with braking system. Found out the pedal switch goes to sleep after 5 min, so you don’t need this. 871594



- RM-88400
by: 08/08/2020

Installation procedures were well documented. Worked the first time and still do! 858378



- RM-88400
by:

good service. just what I ordered. 855528



- RM-88400
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No issues it went in as described The step by step directions and video were spot on 849995



- RM-88400
by:

So it has been a year since installing on our Jeep JL. The install was straight forward. Made many tows with our Class C and has worked flawlessly everytime. Can not say enough good things about etrailer. Purchased several products from them. Great customer service befire and after purchase. Fast shipping 830435



- RM-88400
by:

Instructions were perfect and easy to follow. Highly recommend! 808963



- RM-88400
by:

Excellent product. It is well built, durable and easy to connect and disconnect. The LED lights on the sides are also a great safety feature. I recommend getting the cover to protect it from the elements when not in use. 807224



- RM-88400
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Great product and value 808210



- RM-88400
by:

Great product, easy instructions. Works as advertised 808203



- RM-88400
by:

Installed per instruction had one minor question support from etrailer was prompt and excellent 804587



- RM-88400
by:

So Happy Here!!! Fair price, Great Quality, Everything fit perfectly and looks Great on my Grande Cherokee 804069



- RM-88400
by:

Works as expected, with no problems. I am happy with etrailer and their customer interactions. I installed a Roadmaster tow bar and brakes on my Honda CRV two years ago. I had a problem and they helped me solve it with a new brake light relay kit. All parts of the install on the toad and motorhome are functioning perfectly. 800384


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Ask the Experts about this Roadmaster Tow Bar Braking Systems

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    The Roadmaster Brake-Lite Relay # 88400 that you referenced actually isn't needed for your 2020 Jeep Wrangler Unlimited with the push button start. In order to ensure proper operation of the signal lights and braking system you instead need the Stop Light Switch Kit # RM-751490. I have attached the written installation manual below along with an install video that you can follow along with.
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  • How To Wire the Hopkins Flat-Tow Harness and Roadmaster InvisiBrake Toghter On a 2016 Jeep JKU
    For starters, there is no bridge between the toad and the tow vehicle for the Roadmaster Brake-Lite Relay Kit for Towed Vehicles part # RM-88400. This gets installed solely on the toad. In regards to the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56200, the Roadmaster InvisiBrake Supplemental Braking System part # RM-8700, and the RoadMaster 7-Wire to 6-Wire Flexo-Coil Kit part # RM-146-7 there are going to be components that gets bridged to the tow vehicle. The...
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    The Roadmaster Brake-Lite Relay Kit # RM-88400 actually isn't needed on your 2019 Jeep JL Wrangler. Instead what you need to ensure that your lights are working is a stop light switch. We have the Universal Stop Light Switch Kit # RM-751000 or the Custom Stop Light Switch Kit # RM-751490 for you to use. I confirmed this with my contact at Roadmaster. For a complete flat towing setup you will also need a base plate kit, tow bar, safety cables, vehicle tow bar wiring, a supplemental braking...
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  • Why is Stop Light Switch Needed on 2020 Jeep Wrangler Unlimited
    The reason you need the Roadmaster Stop Light Switch Kit # RM-751490 and not the Brake-Lite Relay #RM-88400 on your 2020 Jeep Wrangler Unlimited is because on some vehicles, the brake light switch is activated electronically, so there's no way to truly tap into it. The Stop Light Switch Kit will provide that signal in place of the OEM signal, so you will need it with the Blue Ox Patriot II Radio Frequency, Portable Braking System # BRK2016, along with 12 Volt Outlet Kit # RM-9332. Additionally,...
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  • Converting 6-Way of Trailer to 7-Way to Connect to 2003 GMC Sierra 2500HD
    Whenever possible I recommend avoiding adapters if they aren't needed as it's another connection point that can cause issues. Since the 7-way connector is much more common than the 6-way I would recommend replacing the 6-way on your trailer with a 7-way that matches your vehicle directly. Easy solution for that is the part # A10-7081VP. I attached a diagram for 7-ways for you to check out as well as one for a 6-way to help make the transition easy.
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  • Can Brake Lite Relay be Used with Hopkins Tow Bar Lighting for 2008 Jeep Wrangler Flat Towed
    Yes the Brake Lite Relay part # RM-88400 does fit with the Hopkins tow bar wiring kit part # HM56200 that you have. This is a required relay solution if you are using supplemental braking that depresses the brake pedal of the vehicle and your taillights come on with the vehicle off.
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  • Does Flat Towing 2016 Chevy Equinox 4 Cylinder Require Brake-Lite Relay
    Thank you for the purchase of the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56108 though I checked with Roadmaster and your 2016 Chevy Equinox does not require the Brake-Lite Relay # RM-88400. There are a number of requirements to flat tow your Equinox, though this relay is not one of them. Fuses need to be pulled so you will need the Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicles - 50-Amp FMX Fuse # RM-76517 and Roadmaster Battery Charge Line Kit for Towed...
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  • Can Brake Light Relay RM-88400 Be Installed on a 2018 Jeep JL Wrangler Unlimited
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  • Troubleshooting Roadmaster Brake-Lite Relay Kit on 2015 Jeep Cherokee
    I spoke with my contact at Roadmaster regarding the issues you are having with the Brake-Lite Relay Kit # RM-88400 on your 2015 Jeep Cherokee. There are a couple possible reasons for why you are having trouble with the push-button start and also the cruise control in your vehicle. First, he said to just verify that when installing the kit, you followed the "Instruction Sheet B" in the included installation manual. This refers to the installation instructions for vehicles that have a...
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    I spoke with Roadmaster about the issue you are having with the Roadmaster Brake-Lite Relay Kit for Towed Vehicles part # RM-88400 on your 2010 Honda Fit. They informed me that if the brake lights do not illuminate while the brake pedal is pressed when the vehicle's ignition is off then the relay is wired incorrectly so you will need to review that portion of the installation instructions which I have attached for you. If you think the relay is bad then you can switch this out for just...
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  • How to Determine if a Brake Light Relay is Required to Flat Tow a Vehicle
    To determine if your 2014 Jeep Grand Cherokee will require a brake light relay like part # RM-88400 you need to answer the following questions: Are you using a supplemental braking system that depresses the brake pedal in your towed car? No - You do not need a brake light relay. Yes - You may need a brake light relay. Continue on to the next question. Do the brake lights on your towed car illuminate while the engine is off? No - You do not need a brake light relay. Yes...
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  • Is a Brake Light Relay Required for Installation of Flat Towing Lighting on a 2013 Lincoln MKX
    The Hopkins Tow Bar lighting kit part # HM56002 has been confirmed as a fit for your 2013 Lincoln MKX so it would work well for you. To determine if a brake light relay # RM-88400 is needed to properly wire your vehicle to be towed, answer the following questions. Are you using a supplemental braking system that depresses the brake pedal in your towed car? No - You do not need a brake light relay. Yes - You may need a brake light relay. Continue on to the next question. Do...
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  • Turn Signal on 2016 Jeep Wrangler Stops Working When Brakes are Applied on RV
    The solution for your 2016 Jeep Wrangler flat towing situation is the RoadMaster Brake-Lite Relay Kit # RM-88400. The Brake-Lite Relay Kit will keep the your Wrangler's brake signal from overriding the turn signal which comes from your RV. I have attached a demonstration video of this relay kit being installed on a similar 2016 Jeep for you to use as a reference.
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  • Installing the Brake Light Relay on a Key-Start 2017 Jeep Cherokee Trailhawk
    I did some checking and the brake light relay # RM-88400 is not required to flat tow the 2017 Jeep Cherokee though there may be circumstances where it is needed. I have included a link to the only video we have showing installation of the relay on a 2017 Jeep Cherokee for you but it is a push-button start so not all of it will apply to you. I have also included our picture showing how it gets wired in the normally open configuration. The explanation of that diagram is as follows: 1)...
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    I attached a diagram that shows where all of the connections of the Brake Lite Relay part # RM-88400 need to be made. Basically the 85 pin gets grounded, 87 gets ran to brake light switch and signal output, 86 runs to a fuse tap, and 30 runs to the brake light wire. I also attached an install video for this kit for you to check out as well. Here's an instructions overview for more info. Remove the blue wire from the kit. This wire is not needed for normally open applications. Locate...
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  • Is Brake Light Relay Needed to Flat Tow 2015 Jeep Cherokee with Push-Button Start
    A brake light relay, # RM-88400, will be required if your 2015 Jeep Cherokee is wired with a 4-diode light kit, # RM-154. Or you could go with a magnetic kit such as # C-ATL20A instead. For a braking system that comes with the brake light relay use the Even Brake # RM-9400. If the push-button start feature does not start the engine when the brake fuse is removed, then you need to perform a normally closed installation. Consult the vehicle owners manual for the fuse locations. The...
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  • Is Brake Light Relay Needed When Flat-Towing 2013 Honda CR-V
    The Roadmaster Brake-Lite Relay Kit, part # RM-88400 is used when you have combined lighting on your towed vehicle and want to use a supplemental brake system. The easiest way to find out if you need a relay is to turn the engine off and when pushing the brake pedal see if the brake lights come on. If they do, then a brake relay switch is needed. from my research it does not appear you need a brake light relay on your CR-V, but you can check to make sure. When towing your CR-V, the Roadmaster...
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  • Is the Brake-Lite Relay Kit Needed for a 2017 Chevrolet Equinox
    The Roadmaster Brake-Lite Relay Kit for Towed Vehicles part # RM-88400 is not required for a 2017 Chevrolet Equinox so you will be good to go without it. That said, to answer your question, this is a universal component so specific installation instructions will not be provided for any one particular make and model.
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