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Then you figure out why and repair it accordingly. Check the bulb. If that checks out, take a test light and see if you have power to it when the brake pedal is depressed. If you don't, then you probably have a wiring fault somewhere between where the wiring for the CHMSL splits off from the wiring for the other brake lights and the CHMSL itself.

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Q: What if third brake light is only one not working?
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