One of these has got to be blown - I can only see one half of the instrument panel (RHS) with any clarity at night.

My question is this: before I start digging around behind the dashboard and trying to replace bulbs and fuses, are the two illumination bulbs on different circuits as some sort of fail-safe? If not and they run off one fuse, then I reckon it must be a blown bulb or bad connection. If they do run off seperate circuits, how will I know which to deal with?

And, no, it's not the rotary light level selector dial!

Also, the light in the swich for the heated rear window is on whwnever the ignition is. Busted switch?