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Q:

dash lights on 1990 Chevrolet Cavalier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I turn on the headlights, the dashlights go out???
(1) Answer
Are your park lights working? The park lights also supply power for the dash back lighting. If the park lights are working then check the dash lights fuse. If there is no power the fuse then the fault could be the dash light dimmer switch.