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Because there is a known issue with the brake lamps on the 2003 Trailblazer. I own a 2003 Trailblazer and had to take it in for service on a recall due to the issue. Take it to your Chevy dealer and have them check the VIN to see if the recall was ever done.

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Q: Why would 7 stop lamp fuses blow in a week on a 2003 trailblazer ext?
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