General 2.3 JTD Maxi - Radio 12v

[Coulstock]

I've had my Rapido 741F ( base vehicle Ducato 2.3 JTD maxi 2004) about a month and annoyingly the radio only operates while the engine is running- It doesn't operate when Ignition is set to PARK- I'm OK with car electrics etc so before I dive in is there a good place to swop the Radio power from 12 v running to Battery power ???