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It's probably not this, but you might want to check it anyway. I'm not sure about the Euro Lumina, but on the regular 1990 Lumina there is a dimmer switch to the left of the steering wheel. It's near the headlight controls. That switch controls the dashboard lighting. The radio has a normal running setting for the lights, but when you turn the lights on, whatever you have the dimmer set at takes over. If that had been turned down or off when you were fixing the lights, that may be why this is happening.
Hope it's something as simple as this.
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