Number plate lights not working

[Ian07]

Hi all, looking for some advice please, I have a 2011 A3 1.8 TFSI sportback, Number plate lights not working, replaced bulbs, still nothing, replaced light holder still not working, the connector which goes to the boot release ( which has the only power supply ) only has one live, there are 4 wires ( brown & white/ brown & grey / 2 brown) should there be 2 lives? any help appreciated. Thanks 

[cliffcoggin]

Check the earth connections.

[Magnet]

Also check wires within the flexible harness twixt tailgate and body. Favourite place for fractured wires due to opening/closing tailgate over the years.