I noticed last evening that the map light seemed to pulsate in brightness in a rhythmic fashion...tonight the dash lights were doing it, so I stopped, got out, looked around, and every light on the car was visibly pulsing. I parked the car for an hour, got in, turned on the lights, and NO PULSE, just normal lights. What's going on?

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2002 Ford ZX2
2 x 2013 Honda Civics