Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

so i am trying to fit a unconventional 3rd brake light using LED's
however once i tried to test to see if the LED's lit up it blew the fuse.

i have tried to connect the positive to the yellow and black wire and the negative/earth to the solid brown wire, just as pretty much every bit of advice i have had says to.
so any help would be grateful

so i found what the problem was i had managed to number 1: buy the wrong voltage LED's (not 12v ones) (duh!!)
number 2: then managed to touch the positive and negative wires together thus creating a short circuit

but it all sort and works now looks rather cool to lol

wrong section dude!