# 1
Roadmaster Brake-Lite Relay Kit for Towed Vehicles
Does NOT work for 2021 and new F-150's. There is a lot of bad advice regarding this in the Q&A section that etrailer needs to update. Associates incorrectly have been including the Brake-Lite Relay kit in the list of items needed to tow late-model Ford trucks. However, with my 2023 F-150 XLT (push button start), it is simply impossible to install. The new Ford trucks do not even have a brake switch on the pedal and there is no visible wiring under the dash. I called Roadmaster, who immediately confirmed that they were aware of the issue. THE RELAY SWITCH IS NOT AN OPTION FOR 2021 AND NEWER F-150's. The only way to overcome the brake light override issue is to wait for the truck to enter "sleep mode." This occurs when you remove the key and don't open the door for 15 minutes. After that, the truck's electronics (body control module" shut off. Then the brake pedal can be pressed and the lights do not illuminate. Thus no relay is needed, you just have to wait 15 minutes. The motorhome wiring harness will work normally through the truck's tail lights, assuming you have installed the smart diode wiring kit for variable voltage. This part works great.
Installed as directions said to and all things are working as they should be. Helpful installation guide and video from trailer
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