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Typically the problem lies with the rheostat, the knob you turn to make the dash lights brighter or dimmer. When you turn the knob a little metal finger rubs along a circular spring changing the resistance, thus changing the intensity of illumination. That spring gets corroded. You can clean it, or you can replace it.

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Q: How do you troubleshoot bad instrument cluster lights in a 1993 Volvo 240 with good bulbs and all other dimmed dash bulbs work fine?
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