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

The Tundra Saw It's First Half Decent Trail Today

TrailJustin · 2026-02-09T23:07:27+00:00

Let me start by saying this truck has no armor yet, so I’m definitely babying it until I can at least get skid plates and rock sliders on. My Tacoma was fully armored and I never had to think twice, but with this truck I move a little more cautiously. That said, my friend and I are avid duck hunters, and the hardest part of duck hunting is access. We do the public land hustle—refuges, walk-in public land, and boat-in spots. It’s all about scouting. We spend weekend after weekend in the offseason figuring out where we can and can’t go. What makes this time especially important is that the birds are still around, so the scouting actually produces useful information. You’re not just guessing—you’re confirming that the birds are still here and using those areas. On top of that, we’re getting deeper into boats. Not big boats like you might think, but small, hand-launch jon boats. And don’t get me wrong—boats are hard. The smaller the boat, the easier it is to carry… but also the sketchier it feels on the water. Add in the gear and it gets heavy fast. You end up hauling all this equipment in and out of the boat at 3 a.m., and a lot of the time you’re dragging the boat a few hundred yards just to get it to the water. That’s just part of the grind. Would love to see other peoples setups on what they are using to hunt and fish?

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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