we have a 91 chevy pickup and all the lights inside the truck are messing up why is this happening

1991 CHEVROLET TRUCK
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RHONDADONNA
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when the headlights are on the inside lights go off but when we turn the headlights off the inside lights come on
Jan 31, 2012 at 3:13 AM
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RIVERMIKERAT
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Inside lights? Courtesy lights? Instrument cluster lights?
Jan 31, 2012 at 3:32 AM