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Roadmaster Stop Light Switch Kit

Roadmaster Stop Light Switch Kit

Item # RM-751490
Our Price: $53.72
You Save: 8%
Tow Bar Braking Systems
Shipping Weight: 0.75 lbs
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Roadmaster Stop Light Switch - RM-751490
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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. Great Prices for the best tow bar braking systems from Roadmaster. Roadmaster Stop Light Switch Kit part number RM-751490 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (88)
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Roadmaster Tow Bar Braking Systems - RM-751490

  • 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


  • Application: custom fit for your vehicle
  • 12 Volts

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.

751490 Road Master Stop Light Switch Kit

Installation Details RM-751490 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Stop Light Switch Kit - RM-751490

Average Customer Rating:  4.8 out of 5 stars   (88 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.


Works great fairly easy install. It has been in use for the last 8 month's with no issues. Here may be some helpful hints that I found when installing. Use 10-12" long extension for 13mm nut (left side of opening panel that was removed). Install bracket. Adjust plunger & backing nut by feel. Remove bracket. Install switch with ring washer & nut. Crimp red & green wires on switch wires. Reinstall bracket under dash.

Michael R.


Still working great


I installed it myself to tow my 2018 Jeep Wrangler as I had experience as an auto mechanic myself years ago. I would not reccomend self install for those without such eperience even though the online videos were helpful. The only issue I had with performance was sticking lock mechasims which was resolved by calling the manufacturer, who instructed cleaning the housings which got dirty.

Lora G.


Tow bar had to be replaced after 6 months use as it failed. There was no charge for the replacement.

Etrailer Expert

Mike L.


@LoraG How did it fail? We're glad to hear that your were taken care of as far as the replacement goes!


This product is not needed for the DUO Plug in Play. The Tech support at DUO will provide you with the correct sequence of connections and will save you time and frustration of trying to install this item. REF; 20 Jeep JL


Tough install under the dashboard of a Jeep for a 75-year-old, but the video instructions by Etrailer were spot-on.




etrailer’s installation video was very helpful. However, the mounting bracket holes on either end seem to be the same size (the video and instructions state that the switch fits into only one end but for me it fit into both). Consequently, it is not clear which side of the bracket to use for the switch vs the vehicle stud. One other installation hint, perhaps unique to the Wrangler Rubicon or Wranglers with upgraded audio/Uconnect, there is an electronic module (3”x4”), mounted to the dash framework behind the lower dash panel, that must be dismounted in order to allow access to the bracket mounting location (see photo).


The installing bracket is difficult to install. If I would have seen the trailer switch and mounting hardware, I would have purchased it.


Works good and a bit of a challenge to install.


Great product installed very easily. I also used this switch to install a Brake Controller. By using this I did not have to tap into the Wrangler electrical system for the Bake Controller.


Great for towing jeep behind the truck


Someone was nice enough to swap the fuse adapter with an inline fuse. Thank you!!


Thank you for always making sure I have the right fit for my vehicle.


If you are pleasing plump as me and arthritic, give yourself some time, not hard to install actuall if I were 40 still would be a 10 minute job





Great product and thanks to for the excellent videos detailing how to install the Demco Stay-In-Play Duo braking system. As a result of watching all of the available videos, I learned that there where a couple of different ways to install the system in our Jeep Wranglers. The first installation I did was in our 2019 Wrangler and that was super easy following the one video on your website. The second installation of the system was not as easy because our 2021 Wrangler has a manual transmission and required having to drill a hole in the firewall/floor board to run the wiring and vacuum tube from the passenger compartment to the engine area. If ever has an installation on a Jeep Wrangler with a manual transmission to perform, hopefully they will video tape that installation to guide customers with Jeeps with manual transmissions. I think's idea of mounting the control box on the fuse box is by far the cleanest and easiest way to install the Demco braking system.
I also followed's videos for installing the brake light system and the base plate on both our Wranglers and could not be happier with them. Thanks etrailer for all you offer.


I installed this system my self with great instruction off etrailer YouTube. Ben a solid working system, no issues and A few thousand miles on the meter.


Product did it's job and came in on tim e!


This product is good quality overall. Installation is tough. I've got big arms and big hands and trying to get the bracket on the stud is all but impossible. Tip: wire the switch BEFORE installing the bracket and switch. Adjusting the switch is equally as difficult. Otherwise, it is a straight forward install.



So far the product has been performing as advertised. We towed from south Florida to Colorado and back with multiple stops and side trips and no issues at all. We even went 4-wheeling in CO for a day and nothing worked loose. Id recommend this product, with some modifications suggested by Rad.


Installed on my 2021 Jeep Wrangler Sport. Only thing I’d change is to strip the wires on the switch and make butt connections before mounting on the bracket. It’s a really tight space for hands under the dash.


The installation videos make it SO easy! It took time for me since I'm a perfectionist but it turned out flawless. I saved over $1000 by installing it myself and etrailer made it possible!!! They covered everything I needed to do the job! Highly recommended etrailer every time!


Kayla’s was very helpful in identifying the parts needed for my Jeep, Roadmaster flat tow project and followed up with an email to confirm delivery was made. Thank you.


I went to E Trailer for my Trailer needs because of the quality of products and variety of options for my needs. Most of all the service is outstanding. The Ladies I delt with were so qualified and knowledgable and able to answer any question asked of them. Very patient in dealing with someone who has little knowledge of just what was needed to achieve my end requirements. You not only get what you pay for, quality, but fast follow up service. Thank You Ladies you all are a precious asset to E Trailer. I am very pleased with the products & service. John 4B15


Works great!


Lets you know your brakes and controller are functioning properly.


Works as advertised and installation was easy with to-the-point instructions.


Package is great, component checklist was important to me and clear color instructions as well as the install videos provided at time of order confirmation are what sets your company apart from the others. Sorry it took me so long to discover etrailer. Thank you!

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