They share a common earth behind the fuel tank, so if one is working, then it has the same earth point as the other.
I would recommend you swap bulbs from left to right to make sure its not simply the fault of the bulb. It may also be the front bulb affecting the rear, check for intensity at the front and if all that doesn't cure it, check the connections green/red and green/white at the indicator arm as well. Swap them to see if the problem follows.
One last spot is the three-way connection behind the instruments ,and the front/rear connection plug behind the wiper motor.
_________________ SooperDooperMiniCooperExpertEngineering
All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.
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