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I think its behind the carpet in the boot behind the lights themselves. If you lift the carpet away on the left/right side in the corner you should see a bolt witha earth on. Trace it to make sure like, but I presume thats the earth for the lights
if you take the tail lights off you will see a wiring loom. i think the earth is the black wire. i had a problem where one of my stop lights wasnt working so i cut it at the loom and bypassed it by connecting them dirctly. dont know if this is related to your problem but just a thought