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Roadmaster Universal Stop Light Switch Kit Instalaltion - 2021 Chevrolet Trailblazer

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How to Install the Roadmaster Universal Stop Light Switch Kit on a 2021 Chevrolet Trailblazer


Hi there, Trailblazer owners. Today on your 2021 Chevrolet Trailblazer, we're gonna be taking a look at and showing you how to install Roadmaster's universal stop light switch. And this is what our stoplight switch looks like when it's installed. it just simply zip ties around our brake pedal and the infrared sensor points towards our firewall. This sensor can then, you'll simply press a button here on the sensor, and that will reset the sensor, letting it know its home position. Once you press that button, the light usually flashes and then it goes out.

And that way, you know you're in the home position. When you press on the pedal, you can see that the light illuminates there because it's moved it out of the home position, and that means it's sending a signal out on the signal wire. The system's very easy to install, it only has three wires. It simply needs power and ground on two of those wires, and the third wire is the output for the sensor. This system, this universal switch can be used for a lot of different things.

We're using it in this particular application to give us a signal for when our brake pedal's being depressed from our supplemental braking system when we're flat towing, so we can get real-time feedback of when our system is actually depressing the pedal. This can be very useful to ensure that your system's operating properly. Can also be really useful for setting the sensitivity of your system when you're getting that all set up. And you can also verify if you've got any issues when going down the road, 'cause one of the things you don't wanna see is when you're driving down the road and you look to see that your monitor light on your supplemental braking system's illuminated, you know, oh no, my brake pedal's probably applied right now. I need to pull over and figure out what's going on.

So it's really nice to get all that real-time feedback. One of the things you might notice on this sensor as we look straight back at the firewall there. I did put a little bit of blue painter's tape on the back of the firewall. If you have extremely dark surfaces on that firewall, the infrared sensor can actually get absorbed. The light can get absorbed by that dark surface, and it will not be able to detect it properly.

Putting something simple like that with a little bit better reflective surface will allow the system to operate much more reliably. One more example of something you might be able to use this for would be a brake controller. Some vehicles that really just weren't necessarily designed from the factory with any kind of factory wiring for a brake output. And if their factory stoplight switch is like a pedal position sensor, you're really not gonna get an on-off signal from your brake pedal when you press it to tell your brake controller when to apply the brakes on your trailer. So on those vehicles that are like that, we can install something like this and get our signal directly from this, and that way we can ensure it's gonna work properly for our brake controller. I also like these because even if you do have a stop light switch in your vehicle, that is operational, maybe you just don't wanna tap into the wires on your vehicle and change its operation, potentially cause a warranty issue down the road or anything like that. So you can just install something like this in here, and that way you don't have to touch the wiring on the vehicle. Everything on the vehicle can stay completely factory and operate the way it was. This just clips right onto your pedal. And it has a harness that plugs into it here. And there are three wires in this harness and those are running right over here. So the red wire from that small harness is power, that's why we like to do that brown wire on our operating unit, to get power from the same circuit. It also has a black wire, which is a small little black one here. We did increase the size of it to a slightly larger black wire using some of the extra black wire in our kit to allow us to quick splice this onto the white wire from our G-Force controller, cause that's ground. And the last wire is the small blue wire here. And this is the output from our switch, which is actually gonna turn that LED indicator on whenever the sensor detects pedal movement. The blue wire here that goes to the LED light, just hooks to the red wire coming from the LED light there. And that completes our installation of Roadmaster's universal stoplight switch on our 2021 Chevrolet Trailblazer..


Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video by:
Jonathan Y
Employee Thomas T
Video by:
Thomas T
Employee Robert C
Test Fit:
Robert C
Employee David F
Test Fit:
David F

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