This was a helpful resource but I’m still unclear on my best option to fish the wires through. 
It looks like yours has a hole on the side that mine doesn’t? Where I drew the x. Some vids online show it going through the small gap in the floor of the bed but that seems too small. Any clarification would be so appreciated! I have a 2020 Tacoma DCSB.
Is the GFC light only a running light or is it both a running and brake light? Thanks
On my Tundra it only lights up when I apply the brakes.
Here you can see my lights are on but light is out, hope this helps. Thanks
Brake light only at least how I have it wired up.
Anyone run into the “brake override malfunction” error after installing this? Tail lights working but brake lights and GFC light are not. Checked fuses and they’re all good. Can’t imagine it’s the brake switch since the brake lights were working prior to connecting GFC light. Open to suggestions! Thanks all.
This will work if you have a Tacoma.
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This will work for 2nd gen?
I don’t think so, different plugs for 2nd and 3rd Gens.
The ones he has right now does not but he has a batch of second GEN plugs on order. I would send him a PM to get on the list
The little cylinder piece that taps and screws into tail light wires, any idea where I could find replacement ones?
I’m sure if you reach out to GFC they can provide you with some more or refer you to where to get some.
I think they are called posi-tap connectors
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Update: the fuse kept shorting and causing my “brake override malfunction” to turn on (which in Tacos can apparently cause your truck to just shut off completely even while driving). Truck is at the dealer now and they’ve determined that it’s an issue with the GFC LED light causing the short. Hoping I can get a new light to self-install from GFC and fingers crossed that will do the trick.
Anyone else have this issue?
Hey guys! In case anyone is intersted I uploaded a video wiring the third brake light on my 2019 Tacoma. Hope it helps - Jonny
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I did this mod and now my Blind spot monitoring is not working. Anyone else?
Did you tap into the OEM wires?
Hey thanks for the video. Just gave it a watch and it really cleared things up.
I followed these instructions to the T (I think). Now though, the GFC light and passenger side brake light are working but the brake light I tapped into is not. I didn’t blow a fuse, anyone have a similar issue? Thanks
J