Wiring Baja Designs S1 3rd Brake Light Through 7-Pin — Anyone Done This?

Make your JBL System Louder

TrailJustin · 2026-02-02T18:29:10+00:00

I was turned onto this by one of the guys in a Facebook group. First, for context, I have a 2022 Limited with the JBL system. Personally, I’m not a big fan of these pre-built audio systems like JBL (or similar) because they don’t really give you a clean upgrade path later if you want to add your own amp or speakers. The system has always sounded a little off to me. I wouldn’t say the JBL system sounds bad, but it’s kind of like taking music that’s meant to be played in 2-channel and forcing it through a 7-channel setup—you end up losing some of the detail and notes in the process. Someone in the Facebook group suggested going into the audio settings and turning off Virtual Surround Sound. They were right—that was it. It’s basically post-processing from the JBL system to simulate surround sound, but for my personal listening preference, it sounds much better with it turned off. Give it a shot.

TrailJustin

Member

Dec 5, 2025

Hey y’all,

I’m running the Baja Designs S1 3rd brake light in the hitch mount from Meso Customs, and I’m looking at wiring it through the 7-pin trailer harness. Has anyone here done this before?

What I’m trying to figure out is how to handle the turn signals. From what I understand, the left and right turn circuits would both need to be tied together to make the S1 act as a brake/marker light… but if I do that, wouldn’t it back-feed into the truck?

I remember running into a similar issue on a past setup, and it worked out somehow, but I don’t want to mess anything up on the Tundra without checking first.

Link

If anyone has successfully wired an auxiliary brake light through the 7-pin, or has a cleaner solution for the Meso hitch mount, I’d appreciate the advice.

Thanks in advance!

Wiring Baja Designs S1 3rd Brake Light Through 7-Pin — Anyone Done This?

TrailJustin

Member

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