iv got exactly the same problem but the other side, along with the tail and number plate light its blowing the dash lights as well... The fuse blowing is the one in small box on the inner wing that holds 2 fuses and has yellow wires going from it to the rear lights!
the rear lights are fed via 2 wires, one for each side.
have you any power to the wire? earth should be working if you've got indicators/brake lights.
there is a joiner about where the rear seat back will sit, front left corner of the boot space. check that also for broken wires/poor contacts.
first think to check is do you have 12V feed to the bulb holder.
the contcts in the bulb holder are pretty rubbish. i shot blasted all mine to ensure a good connection.
can't exactly picture the set-up at the moment though been a while since i looked into one
I'v cleaned the multi connectors in the boot with wd40, had the lights to bits and theyr fine, i just assumed i had a fault on the dash lights or a bad connection under the carpet somewhere! one time i tried it and they worked ok for a few seconds till i shut the door and the vibration blew the fuse again, now the fuse blows as soon as you switch the lights on!
there is another feed for the instrument lights, heater control stuff etc, that is connected to the rear light feed. do the instrument lights work while the rear light isn't?
if not then it could be shorting out somewher behind the dash or the heater controls?
know on mine i found some wires that had all but set fire to the car where they'd been rubbing on the metal of the bulkhead
no mate the dash lights go out with the rear lights as soon as the fuse blows, i'll have to take a look behind the dash for anything obvious and disconnect the multi plug in the loom that feeds the dash lights... Then see if the rear lights work without blowing the fuse!