Dash lights work intermittently, some times they work and other times not for no apparent reason.
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1993 Chevrolet Astro Question: Dash Lights
Answer #1Bret Bodas from RepairPal Test Shop, August 21, 2009, 16:59Master
Try jiggling the light switch and see if that makes them come on, if so the switch is starting to fail. If that doesn't help, then an electrical diagnosis will need to be performed to determine where the fault lies.