If you're looking for the radio fuse (and panel lights, heated windscreen and a few other things) on a Chrsyler Voyager, for a right hand drive car it's above the accellerator pedal in the driver's footwell :-) It's also fed from the "permanently on" circuit through a fuse in the distribution centre on the nearside of the engine compartment.
This took me ages to find this info, trawling the Internet, looking through the manual... thought I'd post the info in case it helps someone.