I have a 56 plate Mondeo ghia x tdci and have a strange problem with the dashlights. After driving along for a bit with the lights on (in auto) the dash lights will suddenly go very dim, you then cannot make out what speed you are doing or anything. Their is a click from the fuse box area when this happens and it doesn't always do it on every journey.
The external headlights etc stay on when this happens and if you switch the lights off and back on again they come back on but this can be a pain in the !Removed! when your on a motorway at night.
Any ideas ? Could it be the switch? or is there a reply that controls the brightness of the dash lights?