OK does the car have a 24 fuse fusebox?
If so the fuse for NS side and tail is number 13 it should be a 10 amp,
the other side is number 14 but I cant find out which side the number plate light is on (is it working?) if its on remove fuse 14 and see if it goes off if it does Cal844 just gave the worst advice I have seen on the forum as you would have connected a probably faulty circuit to a different one, who knows what it would have done!
You are not 100% clear as to wether the stop light works on the NS or is it just the tail part of the lamp? The stop lights are on the same fuse (Fuse 2) so I really cant see any reason for them running two wires in the loom rather than just looping at the NS light like mine in the top photo.
I will wait for your reply to those questions first just in case you have something totally weird in your boot,
Edited by CityEPete, 23 May 2014 - 06:04 PM.