Need help wiring 3rd brake light

Hey, I have an S13 coupe, and the brake light on the spoiler doesn’t work.

When I open the trunk all it is a couple wires hanging out, no more than 10 cm long

So I need to run the wire from that brake light, I’m guessing to one of my tail lights and hook it up so that it’s activated at the same time.

Does anyone have tips on how to do this, what the best method is, etc?

Thanks.

I have my crimping tool and soldering gun if need be,

we’ll check it out when I come to see your car.