2012 Fiat 500c Numberplate Lights

[RosscoPCole]

A message appeared on the dashboard saying the numberplate lights were not working. So I purchased new bulbs and fitted them. The old ones looked black and blown.
The message is still on and the bulbs are not lighting up.
Any suggestions?

[RosscoPCole]

Tabs said:

The wiring from the main bodywork to the hatch? The wires often break up because of the constant opening. Is the heated screen working?

Thanks. It is a convertible, so the heated rear window is not part of the boot hatch. Will look at the wires and see if there is anything obvious.