Window switch does not work?

1991 BUICK CENTURY
22,000 MILES • 3.3L • V6 • 2WD • AUTOMATIC
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GENE WALASIK
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I have the car listed above and my master switch don't work, all the other switches work but not the master. I replaced with brand new Master Switch and have the same problem. Please help!
May 28, 2025 at 10:50 AM
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STRAILER
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It sounds like the ground is bad for the master which is the black wire. I would introduce a good ground to the system to see if it starts working. Strip back the black wire a little bit and run a wire from the negative side of the battery to the black wire and let me know what happens.
May 29, 2025 at 11:32 AM