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Roadmaster Stop Light Switch Kit

Roadmaster Stop Light Switch Kit

Item # RM-751475
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Tow Bar Braking Systems
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Roadmaster Stop Light Switch - RM-751475
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Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied. Lowest Prices for the best tow bar braking systems from Roadmaster. Roadmaster Stop Light Switch Kit part number RM-751475 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (3)
  • Q & A (43)
  • Videos (1)
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  • Why etrailer?

Roadmaster Tow Bar Braking Systems - RM-751475

  • Stop Light Switch
  • Roadmaster

Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied.


  • Activates motorhome brake-monitoring system whenever brake pedal in towed car is applied
    • Ensures that the supplemental braking system is functioning properly
  • Works great for any application that does not have a tow position in the ignition
  • Wires directly into towed car's fuse box for constant current
  • Made in the USA


  • 12 Volts
  • Application: custom fit for your vehicle

This kit allows your RV's monitoring system to alert you whenever the brake pedal of your towed car is being applied. Other systems operate according to whether the air cylinder is extended and provide no indication of what is happening with the pedal itself. If your supplemental braking system is improperly installed, it may be continuously pressing on the pedal, impeding it from fully retracting and possibly causing damage to your vehicle's tires and braking system. With Roadmaster's Stop Light Switch Kit, you will always know when the brake is being depressed, and you will avoid costly damage.

751475 Road Master Stop Light Switch Kit

Installation Details RM-751475 Installation instructions

This Product Fits The Following Vehicles

Video of Roadmaster Stop Light Switch Kit

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Roadmaster Stop Light Switch Kit Review

Today we're going to be taking a look at Roadmaster's line of custom stoplight switch kits. You'll want to refer to our fit guide for the appropriate switch kit for your vehicle.Here on our motor home we have our indicator light that's connected to our stoplight switch. When this light illuminates, we know that our braking system that is installed is applying the brake pedal in our towed vehicle. And we're going to get this signal thanks to our stoplight switch. Here when I hit the brake in our motor home, the light's illuminated so I know that our braking system is working properly.This stoplight switch is going to provide you with an additional brake stop signal. This is important if you're flat towing a vehicle that doesn't have a brake signal when in tow mode.

Without a signal you'll have no way of monitoring whether or not your brake pedal is being depressed. You can use this stoplight switch to connect to the indicator that comes with your supplemental braking system so you can verify for sure that your brake pedal's being depressed when you hit the brakes in your motor home.In most instances it'll be well hidden or blend in with the rest of the wiring down below so you won't even notice it. Here you can barely even glimpse the switch itself. And the kit comes with everything you need to get it installed. This includes the switch, the wiring, the fuse and the custom bracket that's specifically made for it to mount right onto your vehicle.

The bracket's really what makes it custom for your vehicle. It allows the switch to mount seamlessly and easily adjusts to the contour of your brake pedal.A less common use is for a brake controller. If your vehicle doesn't have a compatible brake signal for your brake controller then you can install one of these and get that signal for your brake controller to easily hook up to your trailer.And that completes our look at Roadmaster's line of custom stoplight switch kits.

Customer Reviews

Roadmaster Stop Light Switch Kit - RM-751475

Average Customer Rating:  4.7 out of 5 stars   (3 Customer Reviews)

Avoid damage to your vehicle by ensuring that your supplemental braking system is properly positioned and working effectively. Kit activates your RV monitoring system to alert you when the brakes of your towed car are being applied.

- RM-751475

Ordered parts for installing a brake controller. The videos that are part of the web site were a great help in selecting all the needed parts, detailed down to the part numbers that were needed. I really like the fact that there is a video showing the brake controller installation with my specific vehicle. Great service ! 462995

- RM-751475

This is a great device. The reason I bough it from ETrailer is because of customer service. They are super helpful. Place the brake as suggested and try it out. Works just as expected. 376097

- RM-751475

Installed in 2016 Ford Edge Titanium. Had to buy additional cable connectors that were not included in the kit and instructions did not specify they were required. I would have given 5 stars if it was at least mentioned in the instructions. 366814


Ask the Experts about this Roadmaster Tow Bar Braking Systems

  • Parts Needed to Install Brake Controller on 2016 Mercedes Sprinter 3500
    I'd be happy to tell you all the parts you'd need to install a brake controller in your 2016 Mercedes Sprinter 3500. If it does not have a 4-way you would need to install harness # 118649 before using the Universal Installation Kit for Trailer Brake Controller # ETBC7. You were also correct that a brake pedal switch, Roadmaster's # RM-751475, will be necessary for your Sprinter. As for a brake controller, I strongly recommend the Prodigy P3 # 90195; it is the most popular model we carry...
    view full answer...
  • Is Stop Light Switch Needed for 2016 Ford Edge Titanium with Invisibrake
    Ideally you would do both things in your first question. Disconnect the battery and then run a charge line to it for maintenance. If a manufacturer requires you to disconnect the battery to flat tow it you really do need to do it. You wouldn't want your ignition/coils being energized the whole time you are towing. The # RM-751475 is what allows the Invisibrake # RM-8700 to know when the brakes are applied so the two actually work together.
    view full answer...
  • 7-Way Trailer Connector for a 2017 Mercedes-Benz Sprinter 2500
    In order to install a 7-way trailer connector on the rear of your 2017 Mercedes-Benz Sprinter 2500 you will need to use the T-One Vehicle Wiring Harness part # 118649 with the Adapter 4-Pole to 7-Pole and 4-Pole part # 37185. Unfortunately, they do not make a wiring harness that splices into the taillights and give you a 7-way trailer connector therefore this will be your only option. If you will be towing a trailer with brakes then you will still need to use part # 118649 but instead...
    view full answer...
  • Parts Needed to Wire Brake Controller to 2017 Mercedes Benz Sprinter with Green Connector
    Since you have brake controller pre-wiring already on your 2017 Mercedes Sprinter 3500 you would not need to use a stop light switch like part # RM-751475. We don't sell a connector that plugs right into it, but you can still use it to wire up a brake controller like the P3 part # 90195. You'll need to cut the connector off and then wire the vehicle wiring to the controller's wiring. On the controller the blue wire is the brake output circuit which runs to the 7-way of the vehicle,...
    view full answer...
  • Recommended Trailer Wiring and Brake Controller for 2016 Mercedes-Benz Sprinter 2500
    Everything looks great. The Tekonsha T-One Vehicle Wiring Harness # 118649 is confirmed to fit your 2016 Mercedes-Benz Sprinter 2500. It will install by connecting directly to built-in ports located behind the trim panels in the cargo area on the driver and passenger side. Once plugged in, you will just need to run the hot lead up to the Sprinter's battery. I have attached an installation video that you can use for reference. Then, the Universal Wiring Kit # ETBC7 is exactly...
    view full answer...
  • How To Install a Brake Controller on 2017 Mercedes-Benz Sprinter 3500
    You can hard-wire in a brake controller and it seems that there are not a lot of the Sprinter 3500 models that are pre-wired, at least from what I've seen in my research. I have not seen any reports that this isn't possible, and we even have an installation video to walk you through the process. The way to find out whether or not the plug is present by using a circuit tester like the # 40476 and testing for a hot wire when the brake is pressed- it's possible that one of the plugs that...
    view full answer...
  • Brake Controller Install On 2019 Mercedes-Benz Sprinter 2500 Without Green Plug Under the Seat
    As long as your 2019 Mercedes-Benz Sprinter 2500 has a factory plugin connection point for the adapter part # 3063-P you will not need to make any modifications to the adapter, it will plug right in into the factory plug and the other end to a Tekonsha, TrailerMate or Draw-Tite brake controller. The plug that the harness will use is located under the driver seat. It is a green four pin plug which can be seen in the attached photo. If you do not have this factory plug then the green...
    view full answer...
  • Parts Needed To Use Roadmaster Brakemaster Air Cylinder In New Vehicle and Motorhome
    If you want to use the Roadmaster Brakemaster cylinder part # RM-9100-50 that your friend gave you I have listed the parts below that you will need to use it in the Lincoln. I highly recommend to use the custom seat adapter because if not you will need to drill holes through the floor board of your brand new Lincoln if you use the Universal Floor mount your friend gave you. The stop light switch is needed in the Lincoln to protect the system just in the case that something with the braking...
    view full answer...
  • Recommended Base Plates and Components for 2018 Ford Edge Titanium with Adaptive Cruise Control
    For your 2018 Ford Edge Titanium there is only one base plate kit confirmed to work with the Adaptive Cruise Control. It is the Blue Ox Base Plate Kit - Removable Arms # BX2667 which will then require the adapter # RM-031 which works on Sterling tow bars with serial numbers up to 14,500. If the serial number on your tow bar is 14,501 or above, then the adapter # RM-031-5 is the correct fit. For your tow bar wiring, I recommend the RoadMaster Sterling All Terrain Towing Combo Kit #...
    view full answer...
  • Estimated Installation Time for Roadmaster Base Plates on 2019 Ford Edge ST
    I checked with Roadmaster, and they estimate that the Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-524460-5 which fit your 2019 Ford Edge ST will take approximately 3-1/2 hours to install. I have added a link to the instruction manual for you to take a look at so you can see the installation details firsthand. The other parts you need to flat tow your '19 Edge ST are a tow bar, wiring kit, and supplemental braking system.The best tow bar is the Roadmaster Nighthawk...
    view full answer...
  • Trouble Locating Cold Side of Stop Light Switch for Brake Controller on 2014 Mercedes-Benz Sprinter
    There are some wires that are hot all of the time which is why we usually try to emphasize that the brake controller, like the Prodigy P3 # 90195, needs to be connected to the cold side of the stop light switch when installing the Kit # ETBC7. Sometimes a vehicle will not have a wire connected to the cold side of the stop light switch which is what you are finding. In that case you will simply need to install the Roadmaster Stop Light Switch Kit # RM-751475. This is typically used for...
    view full answer...
  • Recommended Parts to Flat Tow a 2017 Ford Edge Titanium
    Yes, disconnecting the battery with a Quick-Disconnect, like the Deka part # DW05312, will be the easy way to go when it comes to disconnecting the battery on your 2017 Ford Edge so it can be flat towed. Disconnecting the battery prevents it from draining while you are flat towing. Since the owner's manual states that the battery must be disconnected I strongly recommend following those instructions and not trying to get by it somehow. That is one of the down sides to flat towing with...
    view full answer...
  • How to Install a Brake Controller on a 2016 Mercedes-Benz Sprinter 2500
    If your 2016 Mercedes-Benz Sprinter 2500 came with a factory 7-way trailer connector then there should be a green connector located under the driver's seat. This green connector would then be plugged into a Mercedes-Benz speciality harness and attached to a brake controller. However, if you do not have this connection or cannot find it then you will want to proceed with the hardwire option. In order to hardwire a brake controller such as the Tekonsha Prodigy P3 Trailer Brake Controller...
    view full answer...
  • Is Brake Light Required when Using a Supplemental Braking System on a 2017 Ford Edge
    You will not need to use the brake light relay on your 2017 Ford Edge and SMI Stay-IN-Play DUO braking system # SM99251. But since your vehicle brake lights do not light up with the ignition off you will need to use the stop light switch kit # RM-751475. The switch kit activates the motor home brake-monitoring system whenever the brake pedal in your Edge is applied which ensures that the supplemental braking system is functioning properly.
    view full answer...
  • Trailer Brake Controller Installation in 2017 Mercedes-Benz Sprinter 2500
    There is no plug-and-play brake controller harness for the 2017 Mercedes-Benz Sprinter 2500 so brake controller installation will be a hard-wire process. Under the driver's seat there should be a green plug. The wires to this plug can be tested with a circuit tester like # 40376 to confirm their function since vehicle wire colors are not always consistent. A brake controller like the Prodigy P2 # 90885 has 4 wires that require connection to the Sprinter. The black wire is 12V...
    view full answer...
  • Will the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles Work on a 2015 Ford Edge SEL
    I do have an option but the Hopkins Custom Tail Light Wiring Kit part # HM56011 will only fit the 2015 Ford Edge Sport/Titanium, not the 2015 Ford Edge SEL. The 2015 Ford Edge SEL has variable voltage taillights which is where the issue lies. Therefore, you will need to use the Roadmaster Wiring Kit part # RO44FR which requires splicing or the Pilot Magnetic Tow Lights part # NV-5164 for example which does not require splicing. There are no plug and play flat-tow wiring harnesses for a...
    view full answer...
  • How to Power Blue Ox Patriot II Braking System When Installed on 2017 Ford Edge
    I took a look at the online owners manual for your 2017 Ford Edge. It does state that you will need to disconnect the negative (black) cable from the battery before flat towing the vehicle. Because of this, you will won't be able to use the 12V plug on the passenger side to power the braking system. I do also recommend checking your copy of the owners manual for any additional restrictions or guidelines before proceeding. In order to use the excellent Blue Ox Patriot II Braking System...
    view full answer...
  • Recommended Proportional Trailer Brake Controller for Use with Tow Dolly with Electric Brakes
    The trailer brake controllers we most often recommend are the proportional type that slow the towed item (in your case the tow dolly with your 2011 Mini Countryman) at the same rate that the tow vehicle itself slows down. This proportional braking reduces the "tug of war" feeling between the dolly and the tow vehicle. The two versions of our preferred Prodigy controller, the P2 # 90885 and the P3 # 90195, use the same internal technology but the P3 delivers this with additional user-friendly...
    view full answer...
  • Recommended Proportional Braking System for Flat Towed 2015 Ford Edge
    Among the options for flat towing braking systems for use in your 2015 Ford Edge, the Blue Ox Patriot # BRK2016 offers probably the least intrusive and easiest installation. Since the Patriot is wireless and portable the only required changes to the Edge itself are installation of the 12V power outlet kit # RM-9332 and the Stop Light Switch kit # RM-751475. Both of these small parts are easily removed if desired. The real beauty of the Patriot II is that it can stay with you for as long...
    view full answer...
  • How to Power Blue Ox Patriot II Braking System on Ford Edge when Disconnecting Battery Cable
    Since your 2017 Ford Edge requires that the negative battery cable be disconnected to tow the vehicle, you will just need to add the 12 Volt Outlet Kit # RM-9332 for use with your Blue Ox Patriot II Portable Braking System # BRK2016. This kit is needed to provide power to the braking system with the vehicle battery disconnected. The kit attaches directly to the battery terminals to provide the needed power. In order for the Blue Ox Patriot II System to work properly on your vehicle,...
    view full answer...
  • Items Needed to Flat Tow 2017 Ford Edge Behind Class A RV
    If you're switching towed cars and want to get away from the tow dolly method of transporting your car behind your Class A RV then you will no longer need the trailer brake controller used to activate the brakes on the dolly. You will need a different type of braking system for the new towed car, one that installs in it. This is among the items you'll need to flat tow a vehicle capable of being towed in this manner. I checked the online edition of the owner's manual for the 2017 Ford...
    view full answer...
  • Can Blue Ox Flat Towing Parts from 2013 Ford Edge Fit a 2018 Ford Edge SEL
    You will be able to use your Blue Ox braking system and tow bar but you will need new base plates. The 2013 and 2018 Ford Edge SEL use different base plate designs. Base plates # BX2657 work with SEL models that do not have Active Cruise Control or the 2.0 EcoBoost motor. And they will not fit models with the Driver Assist Package. If your 2018 does have Active Cruise Control but not the EcoBoost 2.0 liter motor then you can use base plates # BX2667. These base plates will be compatible...
    view full answer...
  • Recommended Automatic Battery Disconnect for 2015 Ford Edge with Supplemental Braking System
    Since the battery in your 2015 Ford Edge needs to be disconnected before flat towing the vehicle, I recommend using the Roadmaster Automatic Battery Disconnect with Switch # RM-766. This is confirmed to work on your Edge and will allow for convenient disconnect of your battery. This system includes a switch that can be installed inside your vehicle for simple and easy operation. To power a supplemental braking system like the Roadmaster Even Brake # RM-9400 with the battery disconnected,...
    view full answer...
  • Adding a Brake Controller to a 2012 Mercedes-Benz Sprinter with 7-Way Trailer Connector
    Since your 2012 Mercedes Sprinter does not have the wiring to plug in a brake controller but does have a 7-Way trailer connector you will need to do a little hardwiring to install a controller such as # 90195. You will need installation kit # 5506. From the kit you will use the wire, 30 amp circuit breaker, and ring terminals. On the brake controller the white wire will ground to the negative battery terminal. The black wire will connect to the positive terminal via the 30 amp circuit...
    view full answer...
  • Recommended Tow Bar Wiring and Supplemental Brake System for 2016 Ford Edge SEL 3.5 V-6
    I'm happy to help with your lighting and supplemental braking system on your 2016 Ford Edge. For your battery disconnect, I recommend the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766. This will allow you to disconnect your battery without needing to physically wrench on it each time you decide to tow it. For your vehicle, the SMI Stay-IN-Play DUO Supplemental Braking System - Proportional # SM99251 is a confirmed fit...
    view full answer...
  • How to Obtain Brake Light Signal in 2018 Mercedes-Benz Sprinter Chassis
    The ground (cold side) of the brake light signal in a Sprinter can sometimes be found in the wiring above the brake pedal. A high-sensitivity LED circuit tester will be required to test this due to the weak signal strength in this wire. This is due to the low voltages in this vehicle's wiring system. In other cases you may need to install an accessory stop light switch kit # RM-751475 to provide that brake light signal needed to trigger a brake controller like the Prodigy P3 # 90195.
    view full answer...
  • Parts Needed to Flat Tow 2017 Ford Edge Titanium without Adaptive Cruise Control
    The correct Roadmaster base plate kit you need for a 2017 Ford Edge Titanium without active cruise control and a V6 is the part # RM-524454-4 that you referenced. This base plate is perfectly compatible with your Roadmaster Falcon 2 tow bar part # RM-520 that you have as well. These two would work great together. For safety cables you can use # RM-643. The coiled design helps keep the cables off of the ground. For lighting you can use the diode kit, # RM-15267, and not have to worry...
    view full answer...
  • Parts Needed to Flat Tow 2016 Ford Edge Titanium Behind 2014 Thor Chateau Motorhome
    The items required for safe and legal flat towing are outlined in the linked overview article on towing a vehicle behind a motorhome. You will also want to check that the hitch and the MH's frame both are rated adequately for the total weight of your trailer (and the Edge too, of course). Starting with base plates, you can use the Roadmaster kit # RM-524448-4. These fit the Edge without 2.0 EcoBoost. For a car-mount tow bar you can use their StowMaster Tow Bar # RM-501. For safety cables...
    view full answer...
  • 7-Way Trailer Connector for a 2019 Mercedes-Benz Sprinter 2500
    To add a 7-Way trailer wiring connector to your 2019 Mercedes-Benz Sprinter 2500 you first need to add the T-One # 118649 which gives you the basic trailer lighting functions. Once that is installed you can then use the Universal Wiring Kit # ETBC7 to add fully-functional 4-Way and 7-Way connectors at the back of your Sprinter. A no-drill bracket like part # 18136 can be used to hold these connectors near the hitch receiver. Typically when a 7-Way is needed it's because the trailer has...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Written by:
Laura H
Video by:
Dustin K
Video by:
Michael B
Video Edited:
Chris R
Updated by:
Shelly K
Updated by:
Sarah W
Updated by:
Mike S
Updated by:
Isabelle B
Test Fit:
Shane H
Installed by:
David F

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