The ignition switch can cause all kinds of odd electrical problems since it controls the switched 12V power, you might try to check it and see if it is beginning to fail.
When the radio cuts out is it at the same time as the lights, random, or when going over a bump? Mine occasionally changes inputs after a speed bump, if that is what is happening I do not think it is part of the problem.
If the lights are operating independently of the radio it is likely something in the lighting system (perhaps a bad headlight switch) instead of a broader electrical issue.
When you say interior lights, could you be specific, is it everything, or the instrument cluster, overhead light, button illumination, etc?
Hope that helps you get closer to determining the issue.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
Last edited by rick3000; 10-25-2013 at 12:40 PM.
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