Instrument cluster light all off

[Dr. Ian McArthur]

Check the light bulbs in the glove box light and the back up lights.  Also
the light under the hood.

If too many of these are burned out the instrument lights will not work.

I know this sounds crazy, but it's true.  I discovered this after many hours
of diagnostics on my 88 5TQ when the instrument lights would not work.  Then
one night I opened the glove box.  The glove box light went on and so did
the instrument cluster lights.

The same circuit powers all of these bulbs and has some diodes in it.

Ian

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From: quattro-bounces at audifans.com