ghead well, I had the same problem for about 3 years. i lived with it.....until it got real bad! my engine light started to flicker in sync with the interior and now the dash lights.
turns out i had a bad voltage regulator. sucks because the alternator i had was a valeo and there built in so you know what that means!! one alternator lator, everthing works perfect( i put it in myself and saved around 100 bucks!!