Question about 2003 Chevrolet Silverado 1500

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2003 Chevy Silverado SS brake lights aren't working but top cab brake lights are. Bulbs in brake lights are working, and light up when headlights are turned on, but do not get brighter when brake pedal is pushed. Fuses are fine.

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Sounds like the turn signal flasher module has gone bad. It controls the brake lights and turn signals. It is located under the drivers side of the dash. If is a rectangular black box with a grey connector and 8 or so wires connected to it.

Posted on Oct 05, 2010

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2003 chevy 1500 rear brake lights not working, but over the cab break light is. bulbs look good, the running lights work.


sounds like a bad turn signal switch . both side brake lights run through it but the third brake l;ight runs direct from the brake light switch .- play with the hazard button a few times and if the start working you need the turn signal switch

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check the bulbs and make sure the socket is not rusty or dirty

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Brake lights on my Chevy Silverado do not work but the Cab works


the source of this problem is the turn signal switch
STANDARD MOTOR PRODUCTS Part # CBS1148 Price $100
Source: rockauto.com

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There is a probable bad wiring connection in problem one and three.
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It is a common chevy problem for the circuit board that holds to bulb to fail, are your running lights and signals still working back there as well? If not then you need to replace the boards.

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Replace the headlight switch, it is probably causeing a short....

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