How do I Prevent my 2023 Ford F-150 Brake Light From Overriding The Turn Signal
Updated 12/08/2025 | Published 11/17/2025
Question:
The brake relay kit you reference will not work with my 23 f150 because it has no brake light switch. And the the converter you sell to separate the turn signal and brake signal is for incandescent lights. How do I keep my truck brake light from overriding the turn signal?
asked by: Jim N
Expert Reply:
Hey, Jim.
We have received some information recently that any 2023 and newer Ford F-150 wont be able to use the Brake-Lite Relay part # RM-88400. I've gone ahead and linked where a customer shared their findings but I'll also and include it in a quote below as well.
"Neither the brake light relay or stop light switch worked with my F-150. I confirmed with Roadmaster that for Ford F150's 2023 and newer, the brake light relay is no longer an option. The wiring harness and computer have changed. The only option for 2023 and new trucks is to close the doors and wait 10 minutes for the "timeout feature" to kick in. Once the truck goes to sleep, the supplemental braking system and press the brake pedal without activating any electrical signal. The signals work fine coming from the RV wiring and there is no override to worry about. The key thing for users to note here is that for 2023 and newer fords, Brake light relays are no longer applicable. You have to wait 10 minutes for the truck computer to go to sleep, then you can flat tow without any wiring issues."
Sorry that we didn't know this information sooner to be able to put in some web updates. Let me know if you have any additional questions.
Product Page this Question was Asked From
Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Flat Tow Brake System
- Brake Light Relay
- Roadmaster
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Shop: Vehicle Tow Bar Wiring
- Search Results: rm 88400
- Shop: Vehicle Tow Bar Brake System
- Search Results: smart diodes
- Shop: Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Search Results: trailer jack
- Search Results: flat tow wiring harness
- Q&A: Replacing 6-Way on Trailer With 7-Way Connector
- Search Results: rm790
- Shop: Roadmaster Smart Diodes for Variable Voltage LED Tail Lights - Qty 2
- Video: Roadmaster Brake-Lite Relay Kit Comprehensive Review
- Q&A: Wiring A Brake Light Relay Kit In A 2020 Ford F-150 XLT
- Video: Demco SBS Air Force One Coach Air Kit Installation - 2018 Tiffin Allegro Red Mot
- Shop: Electric Jack w/ Footplate - A-Frame - 25-1/8" Lift - 3.5K - Black
- Video: Feature Review Blue Ox 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles
- Video: Let’s Check Out the Roadmaster Smart Diodes for Variable Voltage LED Tail Lights
- Video: The Low-Down on the Blue Ox 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles
- Shop: Roadmaster 6-Diode Universal Wiring Kit for Towed Vehicles with Separate Lighting
- Shop: Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights
- Shop: Roadmaster Smart Diode Kit for Variable Voltage LED Tail Lights - 7-Way to 6-Way Adapter Cord
- Shop: Blue Ox 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles
- Video: Roadmaster Smart Diode Kit Installation Guide - 2025 Ford Ranger
- Video: Comprehensive Review: Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Shop: Trailer Wiring
- Q&A: Recommended Flat Towing Wiring Harness for a 2020 Ford F-150
- Q&A: Troubleshooting Hopkins Wiring Harness to Flat Tow a 2018 Ford F-150
- Q&A: Recommended Parts to Flat Tow a 2006 Jeep TJ
- Q&A: Parts Needed to Flat Tow 2024 Ford Maverick Hybrid
- Q&A: Stop Light Switch and Brake Light Relay for 2025 Ford Maverick Hybrid
- Article: Trailer Wiring Diagrams
on Flat Tow Brake System
Gwendolyn Y.
12/8/2025
Hey Jim, did the timeout method on your 2023 F-150 end up solving the brake light override issue when flat towing? Knowing how it worked for you could really help others with the same truck setup.