Hello John,
The green/orange is the supply from the lighting switch module and the black goes directly to an earthing point.
Is the bulb holder exposed to water to some degree? If so, I'd look there first. With reference to the circuit, if the other left-hand direction indicators are working I don't see how it can be a fuse or the earthing point which is shared.
Simon.
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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