Question about 1999 GMC Sierra

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Lighting problems my lights will be off when the switch is on and on when the switch is off i think its the switch going bad any other opinions

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  • hunter08_194 Oct 25, 2008

    thanks for the opinion i thought that as well so i will do so



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I would take a look at the wiring going into the switch to make sure that it is not shorting out, if it is fine then I would deffinently change the switch.

Posted on Oct 25, 2008


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Modern cars use a computer to switch lights and other stuff and the switches inside the car merely send signals telling the computers when and what to switch on or off and all the additional electronic circuitry makes things very complicated. While it is possible your problem is being caused by a bad switch or relay or a faulty connection or bad wiring it is also possible the circuitry is monitoring the current drawn by the lights and if it thinks it is too high is momentarily shutting the lights down to prevent bigger problems in the same way as those older cars.

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