Dual Tail and Brake light wiring
Upgrading your lights from single brake/running light to dual setup.
Riekert· updated 20 Oct 2026S13
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Rated in dumpster fires out of 10.
🔧 Tools & parts needed
5 itemsThe whole job took about an hour or so to complete.
Basically what i did was the following:
Plug out the the two tail light plugs from the fittings.

Seperate the wires.
wires:
red/green - tail light
red/blue - brake light
black - ground
green/yellow - Indicator (i think its g/y but might be only green too...)

Now you need to cut into these wires, and then wrap another wire around them and extend it

Then get a car light fitting that looks like this. I used the S14 one that I got with that massive wiring harness i bought.

Now those fittings you have - take them and soldier the wires together, so the brake light to brake light etc. you won't be using the indicator wire, so just leave it.

Now for fitting the brackets etc...
For the right hand side I just used the light bracket already there...

just attached the new light fitting and unplugged the fog light plug.
don't think you really need the fog light... especially when your running dual light setup...

On the left I needed to build something to make it fit... this is what oyu can do: get a piece of hardboard, mark it out and then cut it to size, use the foglight fitting to do the measurements... fit the light bracket to the cutout and then use 4 screws to secure in the hole.
I didn't need to do that though... used a spare fitting i had

then after all is connected... test it.
it should come out like mine did.
ah...
well here is what I did today....
Before:



After:







Think this looks much better than stock... what do you dudes/ladie/s think?