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Q:

faulty lightswitch on 1990 Buick Century

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
WITH LIGHT ON.....no tail-light...radio does not dim...buzzer does not come on when key removed....instrument panel lights not on....door panel lights not on.
(1) Answer
Start with the basics, i.e. check all of your fuses and make SURE that the light bulbs work!. I just had a car this week that had light problems and it was just a bunch of burned out bulbs, so as stupid as it may sound, CHECK all of your bulbs. Then, if they are all ok and the fuses are good, then you need to inspect each circuit, i.e. the interior lights, the door chime, the tail lights etc or have a shop do it if you do not know how.

here is a link to a web site with wiring info:

http://bit.ly/mitchell_repair_manuals_online

here are some shops:

http://repairpal.com/directory?address=31204&car_brand_names=Buick