I would suspect the wiper switch is defective. Replace it. Salvage yard is a good source for this part. In the interim, pull the fuse to stop the wipers when they are in the down position.
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If the windshield wipers are not working on a 1990 Chevy Lumina, the problem could be with the wiper motor, the wiper motor relay, or a fuse. The least expensive fix to this problem will be replacing the fuse if it is blown.
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there is no alternator on the 1992 Lumina its all electric, so there is no need for one.
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