Is a Brake Lite Relay Required for 2018 Jeep Grand Cherokee Being Flat Towed
Published 02/05/2020
Products Featured in This Question
Question:
Do I need a brake relay switch when using this supplemental brake system so the Jeep doesn’t override the rv brake or turn signal when applied? I have been looking at questions and videos but have yet to get a solid answer. Thanks!
asked by: Steve M
Helpful Expert Reply:
I understand, there is a lot of components to flat tow a vehicle and even from year to year model changes can make a big difference.
You do not need a brake lite relay for the Roadmaster Even Brake Portable Supplemental Braking System # RM-9400 on your 2018 Jeep Grand Cherokee. That's because when you put your Grand Cherokee into "tow mode" the brake pedal does not provide any power to the brake lights. A brake lite relay is used to not allow power to go through when towing, and allow the lights to come on when not towing.
One sure way you can check to see if you need one is, turn the Jeep off, leave the keys out and do not open the doors or activate anything for about 15 min. Then go and press the brake pedal without opening the doors or activating the lights. If the brake lights do not come on you do not need one. The reason to check this way, is to make sure that the brake light signal is not on a retained power circuit, and that all the circuits go dead.
However, a stop light switch will be needed, Roadmaster Stop Light Switch Kit # RM-751449. Since the factory brake pedal essentially doesn't work in "tow mode" there is no way of knowing if the braking system is working properly. The monitor will tell you when it activates, but not when the pedal moves. So if the arm is misaligned, or if something falls on the brake pedal while towing, you wouldn't know.
I linked an article going over the components needed to flat tow your 2018 Jeep Grand Cherokee, and a video of a 2019 Jeep Grand Cherokee getting the Even Brake and stop light switch installed.
Product Page this Question was Asked From
Roadmaster Even Brake Portable Flat Tow Brake System - Proportional
- Flat Tow Brake System
- Brake Systems
- Proportional System
- Every-Trip Setup
- 12V Outlet
- Portable System
- Not Power Assist Brake Compatible
- Air Brakes
- Air Over Hydraulic Brakes
- Hydraulic Brakes
- Wireless Display
- Roadmaster
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: RV Designer RV Socket Adapter Harness - 4 Way Flat to 7 Way RV
- Video: Setting up the Universal Installation Kit for Trailer Brake Controller on a 2018 Jeep Cherokee
- Shop: Vehicle Tow Bar Brake System
- Shop: Trailer Hitch
- Shop: Roadmaster Stop Light Switch Kit
- Shop: Curt Easy Mount Bracket for 4- or 5-Way Flat and 6- or 7-Way Trailer Connectors - 2" Hitch
- Shop: Roadmaster Stop Light Switch Kit
- Shop: Roadmaster Stop Light Switch Kit
- Shop: Roadmaster Stop Light Switch Kit
- Shop: Plug-and-Play Wiring Harness for Redarc Tow-Pro Trailer Brake Controllers
- Shop: Vehicle Tow Bar Wiring
- Video: Setting Up Your Demco Towed Vehicle Battery Charge Line Kit - 2018 Jeep Cherokee
- Q&A: Is Brake Light Relay Used w/Patriot Braking System and Hopkins Wiring for a 2017 Jeep Cherokee
- Q&A: How To Determine If I Need To Install A Brake Light Relay On My Towed Vehicle
- Shop: Trailer Wiring
- Video: Feature Breakdown: Demco LED Light Bar for Towed Vehicles w/ Wireless Transmitter
- Video: Roadmaster Manufacturer Spotlight - Getting Started With Your Flat Tow Setup
- Video: An In-Depth Look at the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Q&A: Is a Brake Light Relay Needed with a Brake Buddy to Flat Tow a 2014 Chevy Equinox Behind an RV
- Video: A Closer Look at the Heavy Duty Magnetic Tow Light Set
- Q&A: Keeping Your Vehicles Battery Charged While Using The Demco Stay In Play Duo Braking System
- Article: Trailer Wiring Diagrams
- Q&A: What is the Difference Between the Blue Ox Patriot BRK2019 & BRK2022?
- Q&A: Options for Flat Tow Braking Systems for a 2022 Ford Maverick with a 2014 Sunseeker 3010DS
- Article: Must-Have Flat Towing Components
- Q&A: Recommended Tire Covers for 295 80R 22.5 Tires
- Article: Flat Towing Package for 2007-2018 JK Jeep Wrangler and Wrangler Unlimited
- Article: Best Vehicles to Flat Tow Behind an RV
- Article: We Used 34 RV Tow Bars, and These are the Best for Flat Towing
- Article: Flat Tow Package for 2011-2013 Jeep Grand Cherokee
on Flat Tow Brake System
