Isolating the radio

How do I isolate the fitted radio in my 2005 Nuevo? Even when I turn off the radio in the dashboard, and then turn off the isolator switch above the fridge, the radio can still switch itself back on. Is it possible for the radio to switch itself on and off when I'm away from the motorhome? Is  my van possessed??

So is it turning on all by itself?

Sounds like you have some dodgy wiring going on somewhere. With the ignition off and the switch above the fridge off it usually cuts the stereo. Someone might have played with the wiring in the past I guess though so it's permanently live.

You should be able to tell if the radio is still 'on' . With the switch above the fridge 'off', if the radio is still powered then the on/off will show a very small red light. Mine does anyway until I press that on/off button.

Yes. The radio 'on' button remains illuminated when the radio is switched off. Switching off the isolator switch then switches off the radio 'on' button. Having switched off both the radio and the isolator switch has allowed the radio to switch itself back on. Just the once, but enough to wonder what it does when the van is left unattended. It's another of those small 'monitor the situation' situations.
Thanks for the replies.