Additional interesting observation:  
	When I initially start up the A330 with the GPU, the VOR is active, but as soon as it is OFF, the VOR is inactive. 
	So as follows:  
	- Start plane from cold and dark with GPU on and APU on. VOR works. 
	- Disengage external batteries with APU on - VOR do NOT work 
	- Turn on external batteries - VOR works 
	- Start engines and then turn off external batteries. VOR does NOT work 
	- Turn on external power when the engines are running. VOR works
 
	So this is very strange. I have not tried this, but if I could turn on external power in the air, I bet the VOR comes back working.