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I may know the answer if it is a full size Blazer. There is a ground wire for the socket that may be connected to an area that has rusted and no longer is grounded. Reconnect to a solid piece of metal for the light to work.

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โˆ™ 2004-08-14 14:23:57
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Q: Why might the brake lights and left signal light on a '91 Chevy Blazer not work?
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