>> '93 Grand Caravan. All of the instrument lights went out (dash and
>> console). All gages are functioning. The instrument dimmer switch still
>> turns on the interior light when moved to the extreme left (or right,
>> whichever it is). The instrument and illumination fuses under the dash
>> check out ok.

[ lots snipped ]

In addition to the other suggestions, you might wat to try a full power
down. In other words, detach the negative battery cable overnight.

NOTE: your clock/radio will probably lose its settings.
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